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Dissertations / Theses on the topic 'Steel grain size'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Persson, Erik. "Austenite grain growth in bearing steels : An investigation on steel grades 100Cr6 and 100 CRMnMoSi8-4-6." Thesis, KTH, Materialvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140433.

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An investigation of austenite grain growth of two bearing steel grades; 100Cr6 and100CrMnMoSi8-4-6 is performed. Austenitization treatments were performed between 860°C and 1200 °C for 5 minutes to 5 hours and the grain size was determined for each sample.Grain boundary etching was carried out using a water based, picric-acid etchant. Generally,100CrMnMoSi8-4-6 was harder to etch than 100Cr6. Therefore, a precipitation heattreatment was performed in order to facilitate etching of prior austenite grain boundaries in100CrMnMoSi8-4-6. The precipitation treatment was found to be effective. However

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2

Siafakas, Dimitrios. "On deoxidation practice and grain size of austenitic manganese steel." Licentiate thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH. Forskningsmiljö Material och tillverkning – Gjutning, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-37788.

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The exceptional wear resistance and work hardenability, place Hadfield steel as one of themost important materials for manufacturing cast components used in the mining, crashing,drilling, and excavation industries. In all metallic alloys used for component casting, themechanical properties are highly influenced by the microstructure of the material. Castcomponents with finer microstructural characteristics are known to present bettermechanical properties and reduced risk of defects when compared with components witha coarser microstructure. A reduced grain size in Hadfield steel can increase t

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3

Gopalan, Sowmya. "Estimating Columnar Grain Size in Steel-Weld Images using Image Processing Techniques." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250621610.

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4

Wu, Chun-Hsien. "Microstructure of Flash processed Steel Characterized by Electron Backscatter Diffraction." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/36377.

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Flash processing is a new heat treatment process being developed to produce steel with relatively high strength and ductility. It involves rapidly heating steel sheet or strip to a temperature in the austenite range and quenching; the entire thermal cycle takes place within 15 seconds. The resulting microstructure is fine and difficult to resolve using standard metallographic techniques. In this investigation, electron backscatter diffraction was used to measure the grain size, grain orientations, and phase fractions in AISI 8620 samples flash processed to a series of different maximum tempera

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5

Bai, Yu. "Effect of Grain Size on the Hydrogen Embrittlement Behaviors in High-manganese Austenitic Steels." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/202713.

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6

Gullberg, Daniel. "Influence of composition, grain size and manufacture process on the anisotropy of tube materials." Thesis, Uppsala University, Department of Engineering Sciences, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-125336.

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<p>A problem with cold pilgered tubes for OCTG applications is that they can get anisotropic properties with regard to yield strength. One source of anisotropy is texture that is developed during the cold deformation. EBSD measurements have been made on several austenitic stainless steels with different deformations to see what influence the composition has on the texture formation. The same measurements were used to study the influence of grain size on texture formation. The conclusion was that the composition can have an impact on the texture and hence has potential to also affect the anisot

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7

Irshad, Muhammad Aatif. "The effect of prior austenite grain size on the machinability of a pre-hardened mold steel. : Measurement of average grain size using experimental methods and empirical models." Thesis, Karlstads universitet, Avdelningen för maskin- och materialteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-8777.

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The use of pre-hardened mold steels has increased appreciably over the years; more than 80% of the plastic mold steels are used in pre-hardened condition. These steels are delivered to the customer in finished state i.e. there is no need of any post treatment. With hardness around ~40HRC, they have properties such as good polishability, good weldability, corrosion resistance and thermal conductivity. Machinability is a very important parameter in pre-hardened mold steels as it has a direct impact on the cost of the mold. In normal machining operations involving intricate or near net shapes, ma

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8

Kaonda, Mususu Kosta Mpongo. "Prediction of the recrystallised grain size distribution after deformation for the Nb free and model steel." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7680/.

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Grain size refinement can be achieved by recrystallisation during hot deformation, with multiple deformation steps during rolling or forging being used to generate fine grain sizes. Whilst the mode (or average) grain size after recrystallisation can be determined from standard equations the full grain size distribution is required for predicting a range of mechanical properties. In this work an approach has been proposed to allow prediction of the full grain size distribution by varying the value of the D’ parameter value in the Dutta - Sellars equation developed to predict the recrystallised

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9

Myeong-Heom, Park. "Effect of Grain Size on Mechanical Properties of Dual Phase Steel Composed of Ferrite and Martensite." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225592.

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10

Davut, Kemal. "Characterization Of Steel Microstructures By Magnetic Barekhausen Noise Technique." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12608103/index.pdf.

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This aim of this thesis is to examine the possibility of using Magnetic Barkhausen Noise (MBN) technique in characterizing the microstructures of quenched and tempered low alloy steels as well as annealed low carbon steels. To determine the average grain size by MBN, SAE 1010 steel consisting of dominantly ferrite was used. The specimens were slowly cooled in the furnace after austenitizing at different time and temperature variations. By metallographic examination the average ferrite grain size of specimens was determined. The magnetic parameters were measured by a commercial MBN system. Wit

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11

Härtel, Sebastian, Birgit Awiszus, Marcel Graf, et al. "Influence of Austenite Grain Size on Mechanical Properties after Quench and Partitioning Treatment of a 42SiCr Steel." MDPI AG, 2019. https://monarch.qucosa.de/id/qucosa%3A34779.

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This paper examines how the initial austenite grain size in quench and partitioning (Q-P) processes influences the final mechanical properties of Q-P steels. Differences in austenite grain size distribution may result, for example, from uneven heating rates of semi-finished products prior to a forging process. In order to quantify this influence, a carefully defined heat treatment of a cylindrical specimen made of the Q-P-capable 42SiCr steel was performed in a dilatometer. Different austenite grain sizes were adjusted by a pre-treatment before the actual Q-P process. The resulting mechanical

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Basudan, Ibrahim Basudan. "Pneumatic Polishing- New Polishing Method focusing on the effect of Abrasive Grain Size on Surface Roughness of Stainless Steel." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1511970445987042.

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13

Mathis, Tyler Alan. "Predicting Hardness of Friction Stir Processed 304L Stainless Steel using a Finite Element Model and a Random Forest Algorithm." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7591.

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Friction stir welding is an advanced welding process that is being investigated for use in many different industries. One area that has been investigated for its application is in healing critical nuclear reactor components that are developing cracks. However, friction stir welding is a complicated process and it is difficult to predict what the final properties of a set of welding parameters will be. This thesis sets forth a method using finite element analysis and a random forest model to accurately predict hardness in the welding nugget after processing. The finite element analysis code use

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14

Mao, Wenqi. "Deformation mechanism of metastable austenitic steel with TRIP effect and associated kinetics of deformation induced martensitic transformation." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263657.

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15

Janis, Jesper. "Inclusions and/or Particles Engineering for Grain Refining Purposes in Ferritic Fe-20mass%Cr alloys." Doctoral thesis, KTH, Tillämpad processmetallurgi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-13012.

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Compared to more common used austenitic stainless steels, ferritic stainless steels contain very low amounts of the expensive alloying element Ni. In addition, they have good corrosion properties, but are sometimes suffering from poor weldability and bad mechanical properties. This is mainly due to the presence of large grains after casting and large grain growth during heat treatment or welding. Processes for reducing the grain size (grain refining) of metal alloys are widely known and proven before to be suitable for many alloys. A successful grain refining process can increase the strength

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16

Silvério, Valdir Anderson. "Estudo da evolução do tamanho de grão na laminação a quente de barras de aço médio carbono microligado ao vanádio - 38MnSiV5." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-02062008-172934/.

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Os aços microligados ao vanádio são usados em peças automotivas forjadas, tais como virabrequins e bielas. Através de equações matemáticas que descrevem a cinética de recristalização e de crescimento de grão, foi desenvolvida uma rotina em planilha para simular a evolução dos tamanhos de grão austeníticos durante os passes de laminação em função da temperatura, taxa de deformação, tempo entre passes e características do material. O resultado do tamanho de grão ferrítico calculado final, foi comparado com os tamanhos de grãos de amostras retiradas da laminação e de amostras realizadas por simul

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17

Järvenpää, A. (Antti). "Microstructures, mechanical stability and strength of low-temperature reversion-treated AISI 301LN stainless steel under monotonic and dynamic loading." Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526221700.

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Abstract Refining grain size is known to enhance mechanical properties also in austenitic stainless steels. To better understand the background of these properties, various reversion-treated structures were created in AISI 301LN (18Cr-7Ni-0.15N) steel and the microstructural features affecting flow behaviour and strength under monotonic and cyclic straining were investigated. Fully and partially reversed microstructures were produced using prior cold rolling thickness reductions in the range of 32–63% and both resistant and induction heating. Some selected reversed structures were also strengt

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Wei, Lingyun. "Investigate Correlations of Microstructures, Mechanical Properties and FSW Process Variables in Friction Stir Welded High Strength Low Alloy 65 Steel." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2032.

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The present study focuses on developing a relationship between process variables, mechanical properties and post weld microstructure in Friction Stir Welded HSLA 65 steel. Fully consolidated welds can be produced in HSLA 65 steel by PCBN Convex-Scrolled-Shoulder-Step-Spiral (CS4) tool over a wide range of parameters. Microstructures in the nugget center (NC) are dominated by lath bainite and a few polygonal/allotriomorphic grain boundary ferrites. FSW dependent variables are related to FSW independent variables by non-linear relationship. Heat input is identified to be the best parameter index

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Souza, Filho Valter de. "Estudo do comportamento microestrutural de aços forjados a quente em condições de alta taxa de deformação." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264496.

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Orientadores: Sergio Tonini Button, Mauro Moraes de Souza<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-11T13:19:22Z (GMT). No. of bitstreams: 1 SouzaFilho_Valterde_M.pdf: 4133313 bytes, checksum: a0db5181ce553fa4a0c17b20db4a876b (MD5) Previous issue date: 2008<br>Resumo: A conformação a quente, especificamente em prensa horizontal, é um tema de pouco estudo no meio acadêmico, mas interessante pelo emprego da alta taxa de deformação que alcança 90s-1. A microestrutura resultante desse processo é influenc

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20

Kisko, A. (Anna). "Microstructure and properties of reversion treated low-Ni high-Mn austenitic stainless steels." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212159.

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Abstract In this thesis, the influence of reversion and recrystallization annealing on microstructure and mechanical properties was studied in metastable austenitic low-Ni high-Mn stainless steels, some alloyed with up to 0.45 wt.% Nb. Further, the effect of the various microstructures created by reversion and recrystallization on strain-induced martensite transformation in tensile testing was investigated. The aim was to achieve excellent combinations of strength and ductility in the steels and to improve understanding of the behaviour of ultrafine-grained austenitic stainless steels during d

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Piao, Kun. "An Elevated-Temperature Tension-Compression Test and Its Application to Mg AZ31B." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316096630.

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22

Leguen, Claire. "Precipitation controlled prior austenite grain size in steels." Lyon, INSA, 2010. http://theses.insa-lyon.fr/publication/2010ISAL0018/these.pdf.

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Au cours de cette étude nous présentons la corrélation existant entre l’évolution de la croissance des grains austénitiques et celle de l’état de précipitation au cours de traitements thermiques d’aciers. Pour cela, nous avons, dans un premier temps, caractérisé l’état de précipitation expérimentalement. Les fractions volumiques précipitées sont mesurées par dissolution électrolytique. La Microscopie Electronique en Transmission (MET) permet d’obtenir les distributions de taille (imagerie HAADF) et la composition chimique des précipités (EDX, EELS pour le carbone et l’azote). Afin de traiter l

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Almeida, Adriano Alex de. "Influência do tamanho de grão, teor de silício e frequência de excitação nas perdas anômalas do aço GNO." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-19092014-102156/.

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Este trabalho discute o efeito do tamanho de grão, frequência de excitação e resistividade elétrica nas perdas magnéticas, destacando-se a perda anômala. Também é proposto um método de sobreposição de histereses onde é revelada a região de ocorrência da perda anômala durante o ciclo de magnetização e desmagnetização, e posteriormente a curva de histerese da perda anômala é construída. Para tal, três ligas de aço de grão não orientado, com teor de silício de 2,05%, 2,45%, 3,3%, foram tratadas termicamente para aumento do tamanho de grão por crescimento. Cada liga foi tratada sobre a mesma sequê

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Le, Marion. "Influence des liserés de carbures induits par la nitruration gazeuse sur les mécanismes de fissuration de fatigue de contacts roulants." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0102/document.

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La nitruration gazeuse est utilisée par les fabricants d’engrenages pour traiter la surface des dentures. En effet, l’augmentation de la dureté et l’introduction de contraintes résiduelles de compression contribuent à retarder voire inhiber l’initiation et la propagation des fissures superficielles de fatigue de contact. Cependant la majorité des aciers alliés présentent des réseaux de précipités de carbures dans la couche nitrurée. Ceux-ci ont la particularité de se retrouver aux joints de grains relativement parallèles à la surface, ce qui leurs ont attribué les surnoms de «liserés de carbur

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Hawkins, Caleb M. "The Recovery of an AMD-impacted Stream Treated by Steel Slag Leach Beds: A Case Study in the East Branch of Raccoon Creek, Ohio." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1429784673.

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Kalinowski, Piotr. "Recrystallisation and grain size development during forging in power generation steels." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7921/.

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Martensitic 9-12%Cr-based creep-resistant steels are currently employed in a number of power generation applications as a cheaper substitute for the more expensive Ni-based superalloys. A tempered martensite microstructure with a uniform, fine prior austenite grain size is desired to give the required strength and creep-resistant properties at service entry. Refinement of austenite grain size can be achieved via recrystallisation. During hot opendie forging of high-volume rotor discs utilised in power plants non-uniformities of parameters determining austenite grain size, such as temperature,

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Poole, Warren J., Matthias Militzer, and Hamid Azizi-Alizamini. "A novel technique for developing bimodal grain size distributions in low carbon steels." Elsevier, 2007. http://hdl.handle.net/2429/395.

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In this study a new method is introduced to produce bimodal grain structures in low carbon steels. This method is based on cold rolling of dual phase structures and appropriate annealing treatments. The difference in the recrystallization behaviour of ferrite and martensite yields a heterogeneous microstructure with a distribution of coarse and fine grains. These types of microstructures are of interest for optimizing the balance of strength and uniform elongation in ultra-fine grained low carbon steels.

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Flipon, Baptiste. "Alliages à grains ultrafins et bimodaux : approche couplée expérience-modélisation basée sur la microstructure." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMIR06/document.

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Ce travail porte sur l'élaboration et l'analyse du comportement mécanique d'alliages à distribution bimodale de taille de grains. Les applications concernent les aciers inoxydables austénitiques 304L et 316L. Une approche couplée expérience-modélisation est menée pour comprendre les réponses mécaniques macroscopiques et locales de ces nouveaux alliages en se basant notamment sur l'étude des mécanismes de déformation associés. L'utilisation de deux voies d'élaboration et l'optimisation de leurs paramètres a conduit à l'obtention d'un large choix d'échantillons avec différentes distributions bim

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Tunnicliffe, M. C. "The fracture toughness of low carbon steels : the effects of grain size and temperature." Thesis, University of Canterbury. Mechanical Engineering, 1991. http://hdl.handle.net/10092/8327.

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For materials that exhibit a fracture mode transition as temperature is lowered one of the important criteria for material performance is the material's fracture mode transition temperature and not necessarily the specific fracture toughness at any temperature. Therefore, it is important to establish whether operating conditions place a structure below the selected material's transition temperature or that a material is selected with a transition below that of the structure's operating conditions. Quantitative design processes, based on linear elastic (KIC) and elastic-plastic (CTOD) fracture

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Cain, Victoria. "Influence of grain size and niobium content on the creep resistance of ferritic stainless steels." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/5563.

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Includes abstract.<br>Includes bibliographical references (leaves 98-102).<br>Type 441 ferritic stainless steel is used for the production of catalytic converter housings. As the housing is subjected to high temperatures it is necessary that the material offers creep resistance. Type 441 is dual stabilised with Ti and Nb to provide improved weldability; however, Nb addition also enhances the hot strength and creep resistance by means of precipitation and solid solution strengthening. Notwithstanding the Nb strengthening effect, the strong dependence of creep resistance on grain size also means

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Venturelli, Bianka Nani. "Efeito do refino do tamanho de grão pela adição de Hf nas propriedades mecânicas de tração e impacto do aço Hadfield." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-04052018-094951/.

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Este trabalho consiste no estudo das propriedades mecânicas de tração e impacto do aço Hadfield refinado com Hf em relação ao aço Hadfield sem refino. Foram realizadas simulações no software Thermo-Calc para caracterizar o caminho de solidificação e a evolução microestrutural do aço Hadfield (composição química de 13% de Mn, 1,2% de C e 0,65% de Si). Foram fundidos os corpos de prova de aço Hadfield sem refino e refinado pela adição de Hf, ambos com a composição química de acordo com a norma ASTM A128 - grau B2. Os corpos de prova foram submetidos ao tratamento térmico de solubilização à tempe

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Hedman, Daniel. "Casting and Characterization of Advanced High Strength Steels." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81098.

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The Latin American steel making company Ternium S.A. aims to develop and produce a new type of advanced high strength steel (AHSS) in which the main alloying elements are carbon, aluminium, manganese, and silicon. The present work is the first phase of the development project and it involves casting and characterization of four steel compositions with varying amounts of the aforementioned elements. The results revealed that the Mn-content had a large impact on the development of hard phases during solidification. A steel with a Mn-content of 2 %wt. had almost completely transformed to pearlite

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Pan, L. (Longxiu). "Two methods for processing an ultrafine ferritic grain size in steels and the thermal stability of the structure." Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:951427489X.

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Abstract In this thesis, methods to process ultrafine ferritic (UFF) structures in steels, i.e. grain sizes below about 3 μm have been investigated. It is shown here, in accordance with the results in the literature, that a steel with a UFF grain size can be obtained by two methods, more or less convenient to mass production: deformation-induced ferrite transformation from fine-grained austenite (the DIF route) and the static recrystallization of various heavily cold-worked initial microstructures (the SRF/SRM route). In the present work, the influencing factors in the processing of UFF stru

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Silveira, João Ricardo Filipini da. "Modelamento do efeito do tamanho de grão sobre o campo coercivo de aços elétricos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-26082011-140213/.

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Chapas de aço elétrico (0,7% Si e 0,3% Al) foram laminadas a diferentes graus de deformação e recozidas (760º C, 2h) de modo a obter diferentes tamanhos de grão por recristalização. Um outro conjunto de chapas do mesmo material foi recozido a tempos e temperaturas diferentes de modo a obter tamanho de grão variado por crescimento de grão. Os tamanhos de grão foram medidos pelo método dos interceptos e os parâmetros da distribuições de tamanho de grão determinados por um método semi-analítico que se baseia na medição das áreas individuais de cada grão na micrografia. A partir do ensaio quase-es

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RODRIGUES, VICENE A. "Estudo da precipitacao de particulas de MnS no aco Fe-3 porcento Si apos ensaio de compressao a quente." reponame:Repositório Institucional do IPEN, 1996. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10443.

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SANTOS, HAMILTA de O. "Estudo de orientacoes cristalograficas de acos ao silicio utilizando tecnicas de difracao de raios X, difracao de eletrons e metodo ETCH PIT." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10783.

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ALÉCIO, Roberto de Araújo. "Estudo da Relação Microestrutura/Propriedades Mecânicas de Sub-Regiões de Zonas Termicamente Afetadas - ZTAs do Aço API 5L X80." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16856.

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Submitted by Haroudo Xavier Filho (haroudo.xavierfo@ufpe.br) on 2016-04-28T15:47:19Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese_RobertoAlécio_Digital.pdf: 2746118 bytes, checksum: 727a29b8a8ea3f688e67892861afbb5b (MD5)<br>Made available in DSpace on 2016-04-28T15:47:19Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese_RobertoAlécio_Digital.pdf: 2746118 bytes, checksum: 727a29b8a8ea3f688e67892861afbb5b (MD5) Previous issue date: 2015-11-13<br>Uma previsão das propriedades mecânic

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Melquíades, Sérgio dos Reis. "O efeito do carbono no aumento do tamanho de grão e nas propriedades magnéticas de aços elétricos semiprocessados após o recozimento final." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-22072007-204504/.

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Recozimentos realizados nos aços elétricos semiprocessados pelos fabricantes de motores sem um controle adequado da descarbonetação pode resultar em regiões das läminas com pequeno tamanho de grão e consequentemente aumento das perdas magnéticas com queda no rendimento dos motores elétricos. A maioria dos fabricantes de motores nacionais utilizam este tipo de aço e fazem internamente o recozimento final em fornos contínuos com atmosfera à base de nitrogênio com cerca de 5 a 10% de H2 e uma pequena fração de vapor dágua suficiente para gerar uma atmosfera que reaja com o carbono do aço, removen

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Pallaspuro, S. (Sakari). "On the factors affecting the ductile-brittle transition in as-quenched fully and partially martensitic low-carbon steels." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526218977.

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Abstract From the largest discontinuities to the smallest of the elements, various factors can threaten structural integrity. Susceptibility to these factors elevates with higher yield strengths. As-quenched low-carbon steels with a martensitic or martensitic-bainitic microstructure are modern ultra-high-strength structural steels. They can possess sufficient toughness, formability, and weldability, and are typically used in weight-critical and high-performance structures. Common problems with as-quenched steels with a yield strength of 900 MPa or more are that they do not obey the conventiona

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Sapezanskaia, Ina. "Deformation mechanisms of metastable stainless steels accessed locally by monotonic and cyclic nanoindentation." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/398401.

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Metastable austenitic stainless steels feature an abundance of different deformation mechanisms, which contribute to the distinguished mechanical properties of these alloys. However, these properties are known to depend on the local microstructure and also are highly anisotropic. Furthermore, deformation is expected to be different for the bulk and the surface of a sample. In this sense, a discrete study is not trivial. The present work aims at investigation of the main deformation mechanisms and their gradual evolution, by employing controlled deformation of individual austenite grains

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Nassar, Hani. "On Peritectic Reactions and Transformations and Hot Forming of Cast Structures." Doctoral thesis, Stockholm : Royal Institute of Technology, Department of Material Science and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10006.

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Lin, Li-Yi, and 林儷伊. "Effect of Grain Size on Micro Bulging of SUS304 Stainless Steel." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/29392544825743664059.

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碩士<br>國立高雄應用科技大學<br>模具工程系<br>99<br>This study uses commercial simulation package and Nomalized Cockcroft and Latham fracture theory to presict the micro bulging tests and to investigate the effect of grain size on the formability of SUS 304 stainless steel. The study employed annealing treatments in order to alter the microstructures of the stainless steel sheets with three thicknesses of 0.05 mm, 0.1 mm and 0.2 mm and prepare the sheets with four grain sizes. Tensile tests at different strain rates were performed in order to obtain the stress-strain curves for the use in the numerical simulat

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Yeh, Kuo-Liang, and 葉國良. "Effect of Grain Size on Micro Deep Drawing of SUS304 Stainless Steel." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/34380875071706012694.

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碩士<br>國立高雄應用科技大學<br>模具系碩士在職專班<br>101<br>Effect of Grain Size on Micro Deep Drawing of SUS304 Stainless Steel Student：Kuo-LiangYeh Advisor：Dr. Chao-Cheng Chang Institute of Mold and Die Engineering National Kaohsiung University of Applied Sciences Abstract Micro metal parts have been widely used in electronics products which are in great demand in our daily lives. The development of manufacturing technologies of the parts is thus broadly attracted. Micro metal forming processes have characteristics of high product rate, good quality of products and improvement on mechan

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Tsai, Cheng-Han, and 蔡承翰. "Grain Size Effect on Flaring Limit of SUS 304 Stainless Steel Microtube." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/ma93w4.

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碩士<br>國立虎尾科技大學<br>機械與機電工程研究所<br>98<br>Owing to the miniaturization tendency of products, “Micro-forming” is widely used in various fields. Especially micro-tube is a kind of micro-parts, however, the researches in failure mechanism is still not clear. The objective of this study is to investigate the behavior of plastic deformation of micro-tube, such as fracture, necking, bending and buckling. Stainless steel SUS-304 is used in the experiments. Tube thickness is 0.15, 0.3, 0.45 and 0.6 mm respectively. Firstly, to ensure the mechanical properties of SUS-304 tube, tensile test was carried out.

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Hong, Cheng-You, and 洪丞祐. "Effect of Prior Austenite Grain Size on Bainite Sheaf in Silicon Steel." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/51601892278801146166.

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碩士<br>國立臺灣大學<br>材料科學與工程學研究所<br>102<br>Adding about 2wt% silicon to the carbon steel can produce carbide free bainite under the proper heat treatment. This kind of structure is different from normal bainite which consists of a mixture of bainitic ferrite and carbon-enriched residual austenite. Therefore, carbide free bainite has more toughness and strength compared with the normal bainite. However, the development of this microstructure in silicon steel is still not well understood and need further study. The present study attempts to control the austenitizing temperature to explore the micros

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Chen, Han-Sheng, and 陳漢生. "Effect of Grain Size on Micro Square Deep Drawing of SUS304 Stainless Steel." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/11217536938502515014.

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碩士<br>國立高雄應用科技大學<br>模具工程系碩士班<br>102<br>The study investigated the grain size of the SUS 304 stainless steel on the micro square deep drawing. The stainless steel sheets with different thicknesses of 0.05, 0.1 and 0.2 mm were treated by annealing techniques to adjust the grain size and were used in the micro deep drawing process for producing the square cups with 3 mm side length. The study used a finite element package, DEFORM 3D, to simulate the micro square drawing process. According to the design rules from references, punch corner radius, punch section radius, die corner radius and die sec

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Lan, Yuan-Shiau, and 藍元孝. "Effects of Grain Size on the Mechanical Strength of the Precipitated-Harden Stainless Steel." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/19629430527585322226.

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碩士<br>國立屏東科技大學<br>機械工程系所<br>104<br>The characteristic time (CT) of Fairway wood is not restriction resulting to thinning design. In addition, the Fairway wood would be usually producted by use of the pecipitated-harden stainless steel such as Custom 455, Custom 465 and 17-4PH. However, the grain sizes of the alloys would play an improtant role on the thinning design, of which being various high- temperature heated treatment. Therefore, the purposes of the present studies are focused on the effects of Grain Size on the Mechanical Strength of the Precipitated-Harden Stainless Steel. Some results

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Chang, Hsuan-Tsung, and 張玄聰. "Ultrasonic Nondestructive Inspection on the grain size of steel SK-2 with different heat treatment." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/53628099235915230673.

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碩士<br>元智大學<br>機械工程學系<br>95<br>Ultrasonics is one of the most widely used nondestructive inspection technique. It is well known that the grain size of the metal is heavily dependent on the heat treatment. In this study, the grain size of the steel SK2 with different heat treatments is determined by ultrasonic technique. As the ultrasonic waves propagate in the metal, the grain boundary caused the refraction, diffraction and scattering results of the attenuation of the ultrasonic waves and the chauge of the velocity. The relationships between the grain size of SK2 and the ultrasonic attenuation

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Ming-ChiLu and 呂名祺. "The Influence of Grain Size on the Plastic Deformation and Microstructure of Nanostructured 316LVM Stainless Steel." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/qau4yv.

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碩士<br>國立成功大學<br>機械工程學系<br>105<br>In this study, 316LVM stainless steel was examined under different strain rates and grain sizes by using split-Hopkinson pressure bar to investigate its dynamic deformation behaviors and microstructure characteristics. Impact tests were performed under different strain rates ranging from 3×103 s-1 to 7×103 s-1 and different grain sizes of 32μm and 64μm at room temperature. The results reveal that the mechanical properties are greatly affected by strain rates and grain sizes and the Hall-Petch equation can describe the relationship between flow stress and grain

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Man-YenYen and 顏嫚言. "The effects of grain size on the quasi-static deformation behaviour of biomedical 316LVM stainless steel." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/m9gbq7.

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碩士<br>國立成功大學<br>機械工程學系<br>105<br>The purpose of this study is to investigate the effects of grain size and strain rate on the quasi-static deformation behaviour of biomedical 316LVM stainless steel by using compression tests.The tests were performed at room temperature under constant strain rates of 0.001s-1, 0.01s-1, 0.1s-1 at the different grain size of 32μm and 64μm, using the compression test. The results indicate that mechanical properties of 316LVM stainless steel are sensitive to strain rate and grain size. At the constant grain size, flow stress, work hardening rate and strain rate sen

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