Relevant bibliographies by topics / AISI 4140 Steel

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  2. Dissertations / Theses
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  4. Conference papers

Academic literature on the topic 'AISI 4140 Steel'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "AISI 4140 Steel"

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Ambrosini, L., and S. Bahadur. "Erosion of AISI 4140 steel." Wear 117, no. 1 (June 1987): 37–48. http://dx.doi.org/10.1016/0043-1648(87)90243-2.

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da Costa Aichholz, Steffen Alexandre, Michelle Sostag Meruvia, Paulo César Soares Júnior, and Ricardo Diego Torres. "Tribocorrosion behavior of boronized AISI 4140 steel." Surface and Coatings Technology 352 (October 2018): 265–72. http://dx.doi.org/10.1016/j.surfcoat.2018.07.101.

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Zhao, Lirun, Zengrong Hu, Xiaonan Wang, Xiaming Chen, Pengcheng Huan, and Hai Zhang. "Laser Surface Remelting of AISI 4140 Steel." IOP Conference Series: Materials Science and Engineering 774 (March 27, 2020): 012082. http://dx.doi.org/10.1088/1757-899x/774/1/012082.

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Goretta, K. C., A. C. Thompson, and J. L. Routbort. "Erosion of heat-treated AISI 4140 steel." Materials Science and Engineering: A 161, no. 1 (March 1993): L7—L10. http://dx.doi.org/10.1016/0921-5093(93)90488-z.

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Perrusquia, Noé López, Marco Antonio Doñu Ruiz, Victor Hugo Olmos Domínguez, Jorge Victor Cortes Suarez, Jose Luis Velázquez Mendoza, and David Sanchez Huitron. "Hardened AISI 4140 Steel Subjected to Hydrogen." Microscopy and Microanalysis 27, S1 (July 30, 2021): 3360–63. http://dx.doi.org/10.1017/s1431927621011557.

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Cheng, Mohd Zulhasyree Mohd Zulkifli, and Yusri Yusof. "Performance of Turning Steels by Using Polycrystalline Cubic Boron Nitride Cutting Tool." Applied Mechanics and Materials 315 (April 2013): 146–50. http://dx.doi.org/10.4028/www.scientific.net/amm.315.146.

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PCBN cutting tool is widely used in turning process and known as second best cutting tool after Diamond. This study investigates the suitability of PCBN cutting tool to cut variety types of steel. Experimental results for three major parameters which are cutting speed 150, 175 and 200 m/min, depth of cut 0.1, 0.2 and 0.3 mm, and feed 0.1, 0.2, and 0.3 mm/rev were converted into surface roughness analysis to look on the performance of PCBN to cut three different types of steels. The selected work materials of carbon steel AISI 1040, alloy steel AISI 4140 and tool steed AISI D2 were machined in dry tuning process with constant cutting length 50 mm and initial workpiece diameter 40 mm. At the end of this study, it is shown that higher cutting speed produced better surface roughness for AISI 1040 and AISI D2 but worsen the surface of AISI 4140. Low feed value is the most practical parameter to be used to produce fine surface finish using PCBN cutting tool. Fluctuate roughness value produced by increasing depth of cut use in turning parameters and no specific relationship can be concluded between depth of cut and surface roughness value.
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Kusmoko, Alain, and A. Crosky. "A Study Wear Behaviour of Induction Hardened 4140 and Carburised 8617H Steels on 1040 Steel." Materials Science Forum 773-774 (November 2013): 851–64. http://dx.doi.org/10.4028/www.scientific.net/msf.773-774.851.

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This study was undertaken to evaluate the likely effect on the wear rate of changing the pinion material in a rack and pinion steering box from carburised SAE-AISI grade 8617 H steel to induction hardened SAE-AISI grade 4140 steel of the same hardness. Accordingly, pin on disc wear tests were conducted using carburised 8617 H pins and through hardened 4140 pins. The surface hardness of the pins was approximately 60 HRC for both materials. The discs were made of SAE-AISI grade 1040 steel through hardened to a hardness of 45 HRC. The results showed that both the pins and the discs wore more rapidly when the tests were carried out with 4140 pins. The study indicates that the wear rate would be increased on both the rack and the pinion if the pinion material were changed from case hardened 8617 H to induction hardened 4140.
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EKINCI, ŞERAFETTIN, AHMET AKDEMIR, and HUMAR KAHRAMANLI. "MODELING AND INVESTIGATION OF THE WEAR RESISTANCE OF SALT BATH NITRIDED AISI 4140 VIA ANN." Surface Review and Letters 20, no. 03n04 (August 2013): 1350033. http://dx.doi.org/10.1142/s0218625x13500339.

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Nitriding is usually used to improve the surface properties of steel materials. In this way, the wear resistance of steels is improved. We conducted a series of studies in order to investigate the microstructural, mechanical and tribological properties of salt bath nitrided AISI 4140 steel. The present study has two parts. For the first phase, the tribological behavior of the AISI 4140 steel which was nitrided in sulfinuz salt bath (SBN) was compared to the behavior of the same steel which was untreated. After surface characterization using metallography, microhardness and sliding wear tests were performed on a block-on-cylinder machine in which carbonized AISI 52100 steel discs were used as the counter face. For the examined AISI 4140 steel samples with and without surface treatment, the evolution of both the friction coefficient and of the wear behavior were determined under various loads, at different sliding velocities and a total sliding distance of 1000 m. The test results showed that wear resistance increased with the nitriding process, friction coefficient decreased due to the sulfur in salt bath and friction coefficient depended systematically on surface hardness. For the second part of this study, four artificial neural network (ANN) models were designed to predict the weight loss and friction coefficient of the nitrided and unnitrided AISI 4140 steel. Load, velocity and sliding distance were used as input. Back-propagation algorithm was chosen for training the ANN. Statistical measurements of R2, MAE and RMSE were employed to evaluate the success of the systems. The results showed that all the systems produced successful results.
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Elhadj, GHELLOUDJ, HANNACHI Mohamed Tahar, and DJEBAILI Hamid. "EFFECT OF TIME ON THE COMPOUND LAYER FORMED DURING SALT BATH NITRIDING OF AISI 4140 STEEL." Acta Metallurgica Slovaca 24, no. 4 (December 11, 2018): 280. http://dx.doi.org/10.12776/ams.v24i4.1111.

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<p class="AMSmaintext">This research was carried out to study the effect of time on the compound layer of AISI 4140 steel in salt bath nitriding. The nitriding process were implemented on AISI 4140 steel in salt bath component for different times (from 1 h to 10 h) at 580 °C. Samples of AISI 4140 steel were treated and characterized (at surface and core of samples) through the following technique: optical microscopy, scanning electron microscopy, X-ray diffraction (XRD) and microhardness tester. Shows that thick compound layers are formed during continuous salt bath nitriding. The thickness of the compound layer and surface hardness increases with increasing time.</p>
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Chuaiphan, Wichan, Loeshpahn Srijaroenpramong, and Dumrongrit Pinpradub. "The Effects of Heat Treatment on Microstructure and Mechanical Properties of AISI 4140 for Base Cutter Cane Harvester." Advanced Materials Research 774-776 (September 2013): 1059–67. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.1059.

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The effects of heat treatment on microstructure and mechanical properties of AISI 4140 for base cutter cane harvester were studied. The effect of heat treatment - i.e. the different quenching medium (water, oil and air mediums) and the different heat treatment condition (quenching, quenching+tempering, cover scrap cast iron+ quenching and cover scrap cast iron+ quenching+tempering) on the on microstructure and mechanical properties (hardness, impact toughness and bend test). The material AISI 4140 was purchased from local market in Thailand and an emission spectroscopy was applied to quantify the amount of elements in steel. The specimens were heat treated in an induction furnace. The resultant microstructure of materials AISI 4140 consists of martensite and retained austenite after quenching all mediums, which quenching in water it have more than in oil and air medium respectively. The microstructure of materials AISI 4140 after tempering process consists of bainitic structure (ferrite and epsilon carbide) and retained austenite, which tempering in water quenching condition it have more than in oil and air quenching condition respectively. The hardness, impact toughness and bended test are according to behavior heat transfer of quenching mediums. The material alloy steel grade AISI 4140 is the good candidates to promote the quenching in water ,oil and air medium and must be continuous to tempering process. The technique heating by cover scrape cast iron it was good for protected surface and decreased decarburization on surface of steels. But it is not necessary for control microstructure and mechanical properties.
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Dissertations / Theses on the topic "AISI 4140 Steel"

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Trudel, Alain. "Effects of decarburization on the incipient melting temperature of AISI 4140 steel." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22836.

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The continuous heating to fracture test (CHF) developed at McGill was used to study the effect of decarburization on the incipient melting temperature. In the CHF test, a sample was deformed at a constant true strain rate, while its temperature is increased at a constant rate. This test allows the incipient melting temperature to be determined using a single test, instead of the several required by isothermal tensile testing. An isothermal decarburization step, to create a decarburized layer at the surface of the sample, was added prior to the CHF test.
Analysis of the true stress vs temperature curves obtained by CHF testing allows the incipient melting temperature to be determined. Optical metallography was used to determine the effect of decarburization time on the observed depth of decarburization. The heat transfer characteristics of induction heating were studied, since this heating technique is known to create a significant temperature gradient at the surface of the piece being heated. Since the decarburized layer is in the high temperature zone, and also has a higher melting point due to its lower carbon content, it plays an important role in the melting process.
A phenomenological model was derived to describe the melting process. It allows for both the temperature gradient due to induction heating and the melting point gradient due to decarburization. The hypothesis is advanced that melting takes place at the position, within the sample, where the temperature profile crosses the incipient melting temperature gradient. From this study, it appears that decarburization acts so as to limit the risk of hot shortness on a workpiece being forged at high temperatures. This is because decarburization raises the IMT, and in this way widens the temperature window of optimum workability.
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Gomez, Rodolfo Andres. "Monotonic Plasticity-Damage and Fatigue Life Model Correlations on AISI 4140 Steel." MSSTATE, 2007. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07052007-144738/.

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A microstructure-based plasticity-damage model is used to predict the mechanical behavior of commercially available AISI 4140 steel. Monotonic tension, compression and torsion tests were performed to obtain the set of plasticity and damage constants required for model calibration. Then, tension tests on Bridgman notched specimens were undertaken to study the damage-triaxiality dependence. Three different notch radii generated different levels of triaxiality at the notch. The modeled triaxiality-damage correlation was validated with SEM fracture surface analysis. Stress-strain correlations under different strain rate and temperature testing conditions were also studied. Little influence of the strain rate was observed. A preliminary study in high-porosity LENS materials was later performed, with satisfactory stress-strain correlation at two different temperatures on tension tests. Finally, a multistage fatigue model was used to predict life in AISI 4140 steel. The goal was to create a baseline for future application of these mathematical models into LENS manufactured materials in component design
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Tedesco, Marcelo Evandro. "Variação dimensional e microestrutural do aço AISI 4140 em peças usinadas por torneamento." reponame:Repositório Institucional da UCS, 2007. https://repositorio.ucs.br/handle/11338/1033.

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Precisão dimensional e qualidade de superfície usinada são fundamentais em componentes de aplicações mecânicas. Dentre as variáveis que exercem influência sobre estes fatores, está a grande quantidade de calor gerado na usinagem, que deve ser reduzida, minimizando seus efeitos na ferramenta e na estrutura superficial e sub-superficial da peça. Reduzir este calor e seus efeitos é uma das funções da lubri-refrigeração, porém, intensificamse as pesquisas com o objetivo de restringir ao máximo o uso destes fluídos. Neste trabalho, analisou-se a eficiência da lubri-refrigeração na qualidade da superfície usinada, no desvio dimensional e na variação microestrutural de amostras do aço AISI 4140 com diferentes microestruturas, usinado pelo processo de torneamento longitudinal. Observou-se que a lubri-refrigeração não teve efeito considerável sobre a qualidade da superfície usinada, não apresentando uma melhora significativa na rugosidade. Na questão dimensional observou-se que, em mais de 60% dos ensaios realizados, os resultados com e sem a presença da lubri-refrigeração mantiveram-se dentro da faixa de tolerância préespecificada, e na avaliação microestrutural, avaliando a deformação plástica, observou-se que houve uma queda na dureza da borda do material, em comparação com regiões mais próximas do centro do corpo-de-prova.
Submitted by Ana Guimarães Pereira (agpereir@ucs.br) on 2015-10-07T13:50:18Z No. of bitstreams: 1 Dissertacao Marcelo Evandro Tedesco.pdf: 2625254 bytes, checksum: b06979aea49156d0b72bf7d6ea7b3961 (MD5)
Made available in DSpace on 2015-10-07T13:50:18Z (GMT). No. of bitstreams: 1 Dissertacao Marcelo Evandro Tedesco.pdf: 2625254 bytes, checksum: b06979aea49156d0b72bf7d6ea7b3961 (MD5)
Dimensional deviation and surface quality are fundamental components for mechanical applications. The variables that influence these factors, the quantity of heat generated must be reduced in order to minimize their effects on tool and on the superficial and sub-superficial structure of the piece. Reducing this heat and its effects is one of the cooling functions; however, the researches trying to restrict the use of those fluids. In this work, the cooling efficiency was analyzed on the surface quality, dimensional deviation and microstructural variation of AISI 4140 steel samples machined with different microstructure by longitudinal turning process. As a result, it was found that the cooling is not a significant effect on surface quality, not improving the roughness. In regard to dimensional, it was noticed in more than 60% of tests that the results with and without the presence of cooling kept between the pre-specified tolerance ranges. In the microstructural analysis, analyzing the plastic deformation, it as noticed that the hardness decrease in the edge of the sample, comparing with the center.
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Collins, Sunniva Refsnes. "Forging effects on manganese sulfide inclusions as fatigue initiation sites in AISI 4140 steel." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1057696631.

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Qi, Qiang. "INVESTIGATION OF POLISHING METHODS AND SURFACE ANALYSIS AFTER MACHINING AISI 4140 ALLOY STEEL." UKnowledge, 2017. https://uknowledge.uky.edu/me_etds/107.

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AISI 4140 alloy steel has been a very common material to be investigated in automotive and aerospace industries for several decades. AISI 4140 alloy steel is chromium, molybdenum, and manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. The functional performance is largely determined by the surface states after machining. The aim of the present study is to explore the polishing methods and surface analysis after machining AISI 4140 alloy steel in different cutting speeds and cooling conditions. The surface analysis includes surface roughness, hardness and residual stresses. Compared to traditional polishing, an innovative experimental work was conducted on electro-polishing technology for removing surface layer before subsurface residual stress measurement. The results of this work show that the electro-polishing method is a significant approach for the residual stress analysis. High cutting speed and cooling conditions can improve the surface quality to achieve lower surface roughness, higher microhardness and more compressive residual stresses after machining AISI 4140 alloy steel.
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Aguiar, Willys Machado. "Soldagem do AÃo ABNT 4140 sem Tratamento TÃrmico Posterior." Universidade Federal do CearÃ, 2001. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7272.

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O procedimento de soldagem convencional do aÃo ABNT 4140, devido à formaÃÃo de martensita na zona termicamente afetada pelo calor (ZAC), contempla um tratamento tÃrmico pÃs-soldagem para aliviar as tensÃes e melhorar a tenacidade desta zona. Esse tratamento tÃrmico, muitas vezes, se torna impraticÃvel devido a alguns fatores como tamanho da peÃa, reparo no campo e custo. A tÃcnica da dupla-camada tem sido pesquisada no sentido de se evitar este tratamento tÃrmico e garantir boas propriedades mecÃnicas da peÃa soldada. O emprego da tÃcnica da dupla-camada exige uma relaÃÃo adequada entre as energias de soldagem das camadas, para que a segunda refina e revina a ZAC grosseria da primeira, pois, nesta regiÃo a possibilidade de formaÃÃo de martensita à grande devido a sua maior temperabilidade. Neste trabalho, foi utilizado um ensaio preliminar chamado de teste de Higuchi que permitiu a escolha das energias. Em seguida foram realizadas soldagens em simples depÃsito e camada Ãnica em corpos de prova temperados e revenidos com o objetivo de avaliar o grau de refino e revenimento proporcionado pelos passes laterais. ApÃs este ensaio, foram soldados corpos de prova temperados e revenidos utilizando-se a dupla-camada para depois, atravÃs do ensaio de microdureza e metalografia, avaliar o grau de refino e revenimento porporcionados pelo uso da tÃcnica de dupla camada. A soldagem de uma junta semi-V permitiu a avaliaÃÃo da tenacidade da ZAC da primeira camada atravÃs da realizaÃÃo do ensaio Charpy. Os resultados deste ensaio mostraram que as energias absorvidas por corpos de prova soldados, com as relaÃÃes de energias de soldagem (KJ/cm) da primeira e segunda camada de 5/5 e 5/10, sÃo semelhantes as dos corpos de prova com o tratamento tÃrmico pÃs-soldagem e superior a do metal base temperado e revendido, mostrando a viabilidade de tÃcnica.
The welding procedure of the conventional steel AISI 4140 due to the formation of martensite in the heat affected zone by heat (HAZ), comprises a post-welding heat treatment to relieve stresses and improve the toughness of this zone. This thermal treatment often becomes impractical due to factors such as part size, and field repair cost. The technique of double-layer has been studied in order to avoid this thermal treatment and to ensure good mechanical properties of the welded part. The use of the technique of double-layer requires an appropriate relationship between the energy of welding of the layers, so that the second and refines the HAZ revina coarseness of the first, since in this region the possibility of formation of martensite is large because of its higher hardenability . In this work, we used a preliminary test called Higuchi allowing the choice of energy. Then welds were carried out in simple deposit and single layer in specimens quenched and tempered in order to assess the degree of refining and tempering provided by lateral passes. After this test, the specimens were welded and tempered using the double-layer and then through metallography and microhardness testing, evaluate the degree of refining and tempering porporcionados to use the technique of double layer. The welding together of a semi-V allowed the evaluation of the toughness of HAZ of the first layer by conducting the Charpy test. The results of this test showed that the energy absorbed by welded specimens, with the relations of welding energy (KJ / cm) of the first and second layer of 5/5 and 5/10, are similar to those of specimens with post-weld heat treatment and superior to the base metal and tempered resold, demonstrating the feasibility of the technique.
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Evins, Joseph Lee. "Dependence of Strength on Corrosion-Fatigue Resistance of AISI 4130 Steel." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5265.

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Automobile components are often exposed to aggressive environments as a result of aqueous salts from the road coming into contact with unprotected steel. This situation greatly reduces both the life and the appearance of the affected parts. Ultra-high strength steel parts are suspected to exhibit poor corrosion-fatigue properties and be more susceptible to corrosion in general. In this study, the effect of strength level on the decrease in fatigue life of AISI 4130 steel when exposed to an aqueous salt solution is quantified. The observed mechanical properties including corrosion-fatigue behavior are examined with consideration to different microstructural characteristics resulting from heat treatments to the steel. The hardness and tensile properties of the test material were characterized before fatigue testing. Fatigue tests were completed in both air and salt solution to determine the effect on fatigue life of the latter environment. Following fatigue testing, the fracture surface was examined using a scanning electron microscope (SEM) to determine the failure mode. Six strength levels of AISI 4130 steel were investigated ranging from 837 to 1846 MPa (121 268 ksi). The frequency of loading used for corrosion-fatigue tests was 1 Hz and the stress ratio for each test was constant at R = 0.1. The corrosion-fatigue tests consisted of the specimen being submerged in an aqueous solution of sodium chloride, calcium chloride, and sodium bicarbonate and fatigued until failure. The solution was maintained at room temperature with constant aeration to ensure constant oxygen levels. The parameters of interest were the applied loads and the cycles to failure. There were four primary findings of the study. First, decreases in fatigue life of the material caused by the corrosive environment ranged from 100% in the lowest strength level to 190% in the higher strength levels. This result showed that higher strength in this steel corresponds to increasing detriment to fatigue life when the material is exposed to an aqueous salt environment. Second, evidence was found that the salt solution lowered the fatigue limit for each strength level studied in this material. All specimens that were tested in the corrosive environment failed in less than 150,000 cycles, while some specimens fatigued in the air environment experienced run-outs at over 106 cycles. Third, the decrease in fatigue life was attributed to the presence of martensite in the structure of the steel. It was noted that the higher the martensite content, the larger the decrease in fatigue life when exposed to the corrosive environment. Finally, the fracture surfaces of fatigued specimens revealed that a similar cracking mode was present for each strength level in both environments. Enhanced crack initiation was, therefore, assumed to be the cause of the decrease in fatigue life between the air and aqueous salt environments.
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Coletta, Marcus Alberto Della. "Comparação do desempenho à abrasão dos aços AISI 4340, 4140, 5140 e 300M nitretados por plasma em diferentes condições." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-14092016-120013/.

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Os aços de ultra resistência com médio carbono e baixa liga apresentam excelentes propriedades de resistência mecânica e à fadiga além de uma elevada temperabilidade. No entanto, tais aços apresentam o fenômeno da têmpera ou de tratamentos superficiais. O aço 300M foi desenvolvido visando a ampliação desta faixa, permitindo tratamentos em temperaturas em torno de 350ºC viabilizando o emprego da técnica de nitretação do mesmo por plasma sem a consequente fragilização. Neste trabalho comparou-se as características e propriedades do aço 300M nitretado por plasma à 350ºC e 550ºC com os aços de alta-resistência AISI 4340, 4140 e 5140 nitretados à 550ºC. Variou-se as condições de tratamento de forma a verificar a influência do tempo de nitretação e de frequência de pulso nas camadas nitretadas. Verificou-se que a nitretação por plasma demostrou ser bastante efetiva para conferir resistência ao desgaste abrasivo para todos os aços nitretados. O aço 300M nitretado em 350ºC apresentou no ensaio de desgaste abrasivo comportamento similar aos demais aços nitretados em 550ºC, enquanto que o melhor resultado geral foi alcançado pelo 300M nitretado à 550ºC em CC durante 6 horas, devido à formação de uma camada dupla de levada dureza e espessura.
The ultrahigh-strength steels with medium carbon and low alloy, like AISI 4340, show excellent tensile strength and fatigue properties further higher hardenability. However, these steels have the phenomenon of tempering embrittlement, that restrict the temperature of treatments after quench or surfaces treatments. The 300M steel was developed aiming the enlargement this area of application, this steel permits treatments in temperatures about 350°C what allowed to use the plasma nitriding without problems with the embrittlement. In this production were compared the properties of the nitrited layers of the 300M nitriding by plasma in 350°C and 550°C with the steels AISI 4340, AISI 4140, AISI 5140 nitriding in 550°C. Plasma nitriding conditions like time and pulse frequency were varied. It was checked that the plasma nitriding showed good performance to improve the resistance to the abrasive wear in ali the steels tested. The 300M steel nitrited in 350°C showed results similar to the others in the pin-on-disk test and the better result occurred to the 300M steel nitrited in 550°C in dC plasma during 6 hours, because of a duble compound lawyer that arouse with a high thickness and high hardness.
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Chattoraj, Indranil. "The effect of shot peening on hydrogen entry into and hydrogen embrittlement of AISI 4130 steels /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487687115924379.

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Claesson, Erik. "Development of a heat treatment method to form a duplex microstructure of lower bainite and martensite in AISI 4140 stee." Thesis, KTH, Materialvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-165084.

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Research on bainite and martensite structures has indicated that lower bainite needles have a refining effect on the lath martensitic structure. Lower bainte needles partitions prior austenite grains and will consequently have a refining effect on the subsequent formed lath martensite. Smaller austenite grains will result in smaller lath martensitic packets and blocks and will result in enhanced mechanical properties.   In order to create a variation of lower bainte structure in a matrix of martensite, two different heat treating methods were tested. The work was focused towards the formation of lower bainite during isothermal heat treating in molten salt, above and below the MS-temperature. Both un-tempered and tempered samples were analyzed .Two different materials were tested, both were AISI 4140 but with a slightly difference in hardenability. The material provided by Ovako Steel is 326C and 326F the later had a higher hardenability. In order to better distinguish the two structures from each other when studied under a microscope, a variation of etching methods were tested.  It was possible to create a variation of lower bainite structures in a matrix of martensite.  326F shows less amount of lower bainite and provides a higher average surface hardness before tempering.
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Book chapters on the topic "AISI 4140 Steel"

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Bryson, William E. "Heat Treating AISI 4140 Medium Alloy Steel." In Heat Treatment, Selection, and Application of Tool Steels, 83–87. München: Carl Hanser Verlag GmbH & Co. KG, 2005. http://dx.doi.org/10.3139/9783446436701.011.

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Demirkol, Mehmet, and Doǧan E. Gucer. "Low Cycle Fatigue of Martensitic AISI 4140 Steel at Low Temperatures." In Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials, 693–701. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3459-7_107.

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Meysami, A. H., R. Ghasemzadeh, H. Seyedyn, M. R. Aboutalebi, and R. Rezaei. "The Microstructure and Mechanical Properties of Direct-Quenched and Tempered AISI 4140 Steel." In Supplemental Proceedings, 745–53. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062142.ch90.

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Meysami, A. H., R. Ghasemzadeh, H. Seyedyn, M. R. Aboutalebi, and R. Rezaei. "The Microstructure and Mechanical Properties of Direct-Quenched and Tempered AISI 4140 Steel." In Supplemental Proceedings, 245–53. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062173.ch31.

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Meysami, A. H., R. Ghasemzadeh, H. Seyedyn, M. R. Aboutalebi, and R. Rezaei. "The Microstructure and Mechanical Properties of Direct-Quenched and Tempered AISI 4140 Steel." In Supplemental Proceedings, 509–17. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062173.ch64.

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Filho, Marco Stipkovic, Marco Antônio Stipkovic, Éd Cláudio Bordinassi, Sérgio Delijaicov, and Sérgio Luis Rabelo de Almeida. "Experimental Numerical Model of Roughness in Finishing Face Milling of AISI 4140 Hardened Steel." In Improved Performance of Materials, 83–91. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59590-0_8.

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Abdul Khadeer, S. K., P. Ramesh Babu, K. Surender Rao, and A. Seshu Kumar. "Evaluation of Microstructural and Mechanical Properties of Friction Welded AISI 4140 Grade Steel Pipes." In Learning and Analytics in Intelligent Systems, 673–81. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-24314-2_79.

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Ağdaş, Gencer, A. Şükran Demirkıran, and Yıldız Yaralı Özbek. "The Effect of Pulse Plasma Treatment on the Corrosion Resistance of AISI 4140 Steel." In International Multidisciplinary Microscopy Congress, 19–25. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04639-6_3.

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Bechouel, Rafik, Nabil Laalai, and Mohamed Ali Terres. "Influence of the Nitrided Layers Microstructure on the Fatigue Life Improvements of AISI 4140 Steel." In Lecture Notes in Mechanical Engineering, 614–23. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-27146-6_66.

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Utrata, D., and M. Namkung. "Effects of Grain Size and Cooling Rate on Magnetoacoustic Stress Measurement in AISI 4140 Steel." In Nondestructive Characterization of Materials II, 605–13. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-5338-6_62.

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Conference papers on the topic "AISI 4140 Steel"

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Torres, Ricardo, Paulo Soares, Andressa Almeida, and Steffen Aichholz. "Tribological Properties of Boronized AISI 4140 Steel." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-0939.

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Espíndola, Eric, Mateus José Araújo de Souza, BEATRIZ SEABRA MELO, Vinicius Silva dos Reis, Clóvis Santana, Carlos Vinícius de Paes Santos, Emerson Prazeres, and JOSÉ MARIA DO VALE QUARESMA. "AISI 4140 X H13 STEEL SLIDING WEAR BEHAVIOR." In 25th International Congress of Mechanical Engineering. ABCM, 2019. http://dx.doi.org/10.26678/abcm.cobem2019.cob2019-2276.

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Aziz, Saad, Ahmet Eren, and Muhammad A. Wahab. "Frequency Effect of Torsion on Rotating Bending Fatigue Behavior of Gas Tungsten Arc (GTA) Welded AISI 1018 and AISI 4140 Welded Joints." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88338.

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Fatigue failures of welded structure are subjected to occur due to multiaxial fatigue load and torsion. In the current research work, the frequency effect of torsion on rotating bending fatigue load is analyzed on AISI 1018 steel and AISI 4140 steel. To perform rotating bending torsional fatigue test of welded and un-welded specimens, a unit was designed and manufactured. Gas Tungsten Arc (GTA) welding was carried out on round bar of AISI 1018 steel and AISI 4140 steel welded using ER70-S2 filler metal for welded specimen. Later, the influence of torsional frequency on rotating bending with torsion is analyzed on both base metal and welded structures. The frequency of torsion was applied on the specimens were - 500 cycle, 1000 cycle, 1500 cycle, 2000 cycle and 2500 cycle. From the analysis, fatigue life of AISI 1018 and AISI 4140 base metal specimens (rotating bending and torsion) were not affected when torsion was applied at different frequencies. However, fatigue behavior of welded AISI 1018 and AISI 4140 specimens were highly affected by the frequency of torsion. For torsion applied at every 500 cycles, 83.8% reduction of fatigue life was observed for AISI 1018 welded specimen with respect to AISI 1018 base metal specimens. In addition, torsion applied for every 1000, 1500, 2000, and 2500 cycles; 81.9%, 80%, 77.1%, and 72.4% reduction on fatigue life were observed for AISI 1018 welded specimen compare to AISI 1018 base metal specimens, respectively. Welded AISI 4140 specimens experienced less change in fatigue life compare to welded AISI 1018 specimens. For torsion applied at every 500 cycles, 73.9% fatigue life reduction was observed for welded AISI 4140 specimens compare to AISI 4140 base metal specimens. For torsion applied at every 1000, 1500, 2000, and 2500 cycles; 65.2%, 60.8%, 50%, and 43.5% fatigue life reduction occurred on welded AISI 1018 specimen. Moreover, hardness measurements for welded specimens of AISI 4140 and AISI 1018 were performed longitudinally. For welded AISI 1018 specimen, 14.8% and 9.7% hardness decrease was observed longitudinally compare to AISI 1018 base metal specimen at heat-affected zone (HAZ) and from heat-affected zone through weld zone, respectively. For welded AISI 4140 specimen, 26.3% reduction of hardness value was observed compare to AISI 4140 base metal through heat-affected zone for longitudinal analysis. Moreover, fracture surface analysis was performed on the welded and non-welded specimens to understand the fracture behavior.
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Santos, Rogério Felício dos, Ernane Rodrigues da Silva, André Rezende Figueiredo Oliveira, Henara Lillian Costa, and Alberto Arnaldo Raslan. "SURFACE MICROHARDNESS OF AISI 4140 STEEL NITRIDED DURING ELECTRIC DISCHARGE MACHINING." In 2nd International Brazilian Conference on Tribology. São Paulo: Editora Blucher, 2014. http://dx.doi.org/10.5151/1472-5836-25756.

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Ren, Zhencheng, Xiaoning Hou, Yalin Dong, and Chang Ye. "Effect of Nanocrystallization-Assisted Nitriding on the Corrosion Behavior of AISI 4140 Steel." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8705.

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In this study, an innovative process called nanocrystallization-assisted nitriding was used to process 4140 steels. First, a nanocrystalline surface layer was induced in 4140 steel by ultrasonic nanocrystal surface modification (UNSM). The abundant nanoscale grain boundaries provide micro-channels for efficient nitrogen diffusion during nitriding at relatively low temperature (450 °C) and short duration (4 hours). The samples were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The hardness and corrosion resistance were examined and compared for samples after different processing conditions. It has been demonstrated that the sample processed by nanocrystallization-assisted nitriding has much higher hardness and corrosion resistance compared with the samples processed by nitriding only.
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Rowan, Olga K., and Michael A. Pershing. "Alloying Effect on Nitrided Case Characteristics of Nitralloy 135M and AISI 4140 Steel." In HT2021. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.ht2021p0117.

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Abstract Nitriding surface hardening is commonly used on steel components for high wear, fatigue and corrosion applications. Case hardening results from white layer formation and coherent alloy nitride precipitates in the diffusion zone. This paper evaluates the microstructure development in the nitrided case and its effects on the hardness in both the white layer and the substrate for two industry nitriding materials, Nitralloy 135M and AISI 4140. Computational thermodynamic calculations were used to identify the type and amount of stable alloy nitrides precipitation and helped explain the differences in the white layer hardness, degree of porosity at the surface, and the hardening effect within the substrate. Some initial insights toward designing nitriding alloys are shown.
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Bandyopadhyay, B. P., and Kalyan R. Endapally. "Experimental evaluation of the effect of minimum quantity lubrication in turning AISI-4140 steel." In Industrial Engineering (CIE39). IEEE, 2009. http://dx.doi.org/10.1109/iccie.2009.5223692.

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Roy, Sougata, and Amitava Ghosh. "High Speed Turning of AISI 4140 Steel Using Nanofluid Through Twin Jet SQL System." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1067.

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Application of small quantity lubrication (SQL) technology in high speed machining is being recognized as a sustainable approach for achieving suitable cooling/lubrication in machining zone. Present investigation focused on effectiveness of SQL with nanofluids in high speed turning of AISI 4140 steel with a TiN-top coated multilayered carbide insert and explored the advantages of using a twin-jet SQL system instead of a single jet one. SQL system was developed in-house with external-mix nozzles. The experiment was conducted varying the cutting velocity at two different feed rates (0.05mm/rev and 0.10mm/rev) with conventional coolant and nanofluids. Immediate improvement in machinability and the quality of turned surface was observed with twin-jet nanofluid SQL. A significant reduction of force and specific energy could be achieved by using 3vol% alumina and 1vol% multi walled carbon nano tube (MWCNT) nanofluid instead of soluble oil. The MWCNT nanofluid was found to be superior to alumina nanofluid in reduction of tensile residual stress. Such a reduction is typically an indirect indication of reduction of cutting zone temperature, which could be achieved due to enhanced level of lubricity at chip-tool interface and enhanced level of heat dissipation ability of the nanofluids. Improvement in retention of sharpness of tool cutting edges was also observed under nanofluid-SQL environment, which could have played important role in improvement of surface quality.
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Pfennig, A., and A. Kranzmann. "Influence of CO2on the corrosion behaviour of 13Cr martensitic stainless steel AISI 420 and low-alloyed steel AISI 4140 exposed to saline aquifer water environment." In AIR POLLUTION 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/air090371.

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Mendieta, Rodrigo Maldonado, and Juan de Dios Calderón Nájera. "Analysis of MQL Effect on Forces, Friction, and Surface Roughness in Turning of AISI 4140 Steel." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6344.

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Minimum Quantity Lubrication or MQL is an increasingly used technique for metal cutting operations and it has become an attractive alternative for machining parts at big scale production. However, fully lubricated conditions are still in use for machining special materials so that surface finish, tool wear, and temperature distribution levels remain at optimum levels. On the other hand, dry condition machining is in use as well although with some restraint due to issues with material burr, surface roughness, and tool wear. The main purpose of this work is to analyze the effects of cutting fluid flow rate, its application mechanisms, and cutting speed on surface roughness and establish the lowest possible cutting fluid flow rate that yields to minimum surface roughness (Ra). To achieve the objective, a set of experiments was performed using a Computer Numerical Control (CNC) lathe instrumented with a Kistler 9121 dynamometer and a customized cutting fluid application system to obtain coefficients of friction and cutting forces. Finally, a previously 2D finite element analysis (FEA) simulation from Akbar et al. [1] is applied and compared to experimental results to find out if the cutting force can be predicted. A first regression model that correlates cutting force and surface roughness is posed, so that FEA simulation can be implemented to predict the final surface roughness. AISI 4140 machinery steel in annealed condition is used to carry out the simulated and experimental work.
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