Relevant bibliographies by topics / DP980

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Academic literature on the topic 'DP980'

Author: Grafiati
Published: 4 June 2021
Last updated: 27 April 2022

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Journal articles on the topic "DP980"

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Panich, Sansot. "Constitutive Modeling of Advanced High Strength Steels Characterized by Uniaxial and Biaxial Experiments." Advanced Materials Research 849 (November 2013): 207–11. http://dx.doi.org/10.4028/www.scientific.net/amr.849.207.

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Anisotropic plastic behavior of advanced high strength steel sheets of grade DP780 and DP980 were investigated using three different yield functions, namely, the von Mises, Hills 48 and Barlat2000 (Yld2000-2d) criteria. Uniaxial tensile and balanced biaxial (hydraulic bulge) tests were conducted for the examined steels in order to characterize flow behavior and plastic anisotropy for different stress states. Additionally, disk compression and In-plane biaxial tension tests were performed for obtaining balanced r-value of DP780 and DP980, respectively. All these data were used to determine the anisotropic coefficients. According to the different yield criteria, yield stresses and r-values for different directions were calculated corresponding to these yield criteria. The results were compared with experimental data. It was found that the Yld2000-2d model precisely predict well with experimental data than the other models.
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Phaoniam, Rittichai, Jesada Kaewwichit, and Komgrit Lawanwong. "Comparative study of dissimilar tailor-welded blanks between DP590 and DP980 dual phase steels." MATEC Web of Conferences 192 (2018): 01041. http://dx.doi.org/10.1051/matecconf/201819201041.

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This research aims to study the dissimilar tailor-welded blanks between DP590 and DP980 dual phase steels using the autonomous GTAW process. The summarized results are as follows. It was found that utilized welding parameters in DP590 and DP980 steel butt joint were able to achieve complete penetration joint and there were not any defects. Furthermore, the dissimilar weld zone produced the hardness profilevalue between the DP590 and DP980 base metal. In particularly, DP590-HAZ region resulted in harden zone. Meanwhile, DP980-HAZ region induced a soften zone. By the way, the harden DP590-HAZ exhibited fine columnar martensite with a ferrite matrix. On the other hand, the soften DP980-HAZ represented a tempered martensite structures. Comparing the tensile test was carried out in order to investigate dissimilar welded joint strength in the different rolling directions. It was suggested that the specimen welded along to rolling direction was evidently larger tensile strength (1092 MPa) than the welding transverse to rolling direction (638 MPa). Moreover, the weakest fracture occurred apparently on the region of DP590-BM rather than the HAZ region.
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Feng, Qiao Bo, Yun Feng Zhu, and He Xin Zhao. "Research on Resistance Spot Welding of DP980 Dual Phase Steel." Advanced Materials Research 860-863 (December 2013): 780–83. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.780.

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The process parameters and quality of resistance spot welding for DP980 dual phase steel were studied through the orthogonal experiment method, and the influence of welding current, welding time and electrode force on the strength of welding joint has been discussed. The results show that the welding current has the greatest influence on the quality of welding joint for DP980 dual phase steel, and it needs relatively lower welding current for the DP980 dual phase steel as it has high resistivity, and appropriate increasing of electrode force is a feasible way to avoid the defect of shrinkage and it improves the joint strength.
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Park, Namsu, and Hoon Huh. "Prediction of Fracture Strains for DP980 Steel Sheets Using a Modified Lou–Huh Ductile Fracture Criterion." Key Engineering Materials 626 (August 2014): 347–52. http://dx.doi.org/10.4028/www.scientific.net/kem.626.347.

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This paper is concerned with the prediction of fracture strains for DP980 steel sheets using a modified Lou–Huh ductile fracture criterion. The usage of DP980 steel is significantly increasing in the automotive industry for weight reduction, enhancement of crashworthiness and safety of car body. The material behavior of AHSS show unpredictable and sudden fracture during sheet metal forming process. A modified Lou–Huh ductile fracture criterion is utilized to predict the formability of AHSS because the conventional FLD constructed based on necking is unable to evaluate the formability of AHSS. Fracture loci were extracted from 3D fracture envelopes by assuming the plane stress condition to evaluate equivalent plastic strain up to the point of fracture at a wide range of loading paths. Three different types of specimens such as pure shear, dog-bone and plane strain grooved specimens were used for tensile tests to construct 3D fracture envelopes of DP980. Fracture strain of each loading path was evaluated to show that there is little deviation between predicted fracture strains and experimentally acquired ones. From the comparison, it is concluded that the 3D fracture envelopes can accurately predict the onset of the fracture of DP980 steel sheets in complicated loading conditions including the pure shear condition.
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Zhumagulov, Amir, Armin Abedini, Taamjeed Rahmaann, José Imbert, Clifford Butcher, Michael Worswick, Skye Malcolm, Jim Dykeman, and Hesham Ezzat. "High Rate Characterization of Three DP980 Steels." EPJ Web of Conferences 183 (2018): 02060. http://dx.doi.org/10.1051/epjconf/201818302060.

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Advanced high strength steels (AHSS) are used extensively in the automotive industry in the ongoing effort to reduce vehicle weight. Their increased strength allows for the reduction of sheet thickness, and thus a reduction in mass, while offering formability and cost advantages when compared to other metal alloys typically considered for lightweight applications. DP980 steels are AHSS being considered for structural energy absorbing components; however, there is a lack of published information on their high rate behaviour. This paper presents the results of an experimental program that characterized three production DP980 steels from three different manufacturers at strain rates of 0.001, 1, 10, 100 and 1,000 s-1. An electro-mechanical frame was used for the quasi-static tests, the 1, 10, and 100 s-1 tests were carried out using a fast hydraulic apparatus and the 1,000 s-1 experiments were carried out using a tensile split Hopkinson bar. The quasi-static hardening response at strains higher than the uniform elongation of about 7% was obtained by using a shear test, thus avoiding the use of inverse modelling techniques. The results indicate that the DP980 steels are moderately rate sensitive, with one of the materials showing higher sensitivity than the others. One of the materials exhibited a yield point phenomenon that appears to affect the behaviour of the material at 100 and 1,000 s-1, however, the reasons for this behaviour remain an open question. The data was fit to modified Johnson-Cook and Cowper-Symonds model to account for rate sensitivity. The results presented in this paper provide a tool for modelling the dynamic behaviour of DP980 steels.
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Gao, Shuling, Yuntao Li, Lijun Yang, and Wencong Qiu. "Microstructure and mechanical properties of laser-welded dissimilar DP780 and DP980 high-strength steel joints." Materials Science and Engineering: A 720 (March 2018): 117–29. http://dx.doi.org/10.1016/j.msea.2018.02.057.

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Rosado-Carrasco, Juliana G., Walter F. González-Zapatero, Christian J. García, César M. Gómora, David Jaramillo, and Ricardo R. Ambriz. "Analysis of the Low Cycle Fatigue Behavior of DP980 Steel Gas Metal Arc Welded Joints." Metals 12, no. 3 (February 27, 2022): 419. http://dx.doi.org/10.3390/met12030419.

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Dual phase (DP) steels have high strength, while maintaining outstanding elongation capacities. This is possible using a well-controlled thermomechanical process that produces a perfect phase combination in the DP microstructures. However, automotive makers are required to weld the DP steels, which generates a soft zone in the microstructure. In this work, 1.6 mm-thick DP980 steel sheets were welded by gas metal arc welding process to analyze the response of the welded soft zone to cyclic loading conditions. Conducted macrographic and metallography analyses revealed good quality in the appearance of the welded joints, with a complete fusion of the DP980 joint and without the presence of discontinuities. Low cycle fatigue tests of the DP welded joints were conducted under a constant amplitude strain control mode. The welded joints experienced a fatigue life reduction with respect to the DP980 steel of ~16% at strain amplitudes of 0.2, 0.3, and 0.4%. For strain amplitudes larger than 0.6%, the fatigue life of the welded joint was reduced by 39%. Weld thermal cycles combined with metallography analysis indicated that a tempered process of the martensite during the welding was responsible for the soft-zone formation and the poor fatigue response.
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Li, Haijun, Tianxiang Li, Chaofei Li, Zhaodong Wang, and Guodong Wang. "Improvement of Longitudinal Performance Uniformity of Hot-Rolled Coils for Cold-Rolled DP980 Steel." Metals 10, no. 3 (March 17, 2020): 382. http://dx.doi.org/10.3390/met10030382.

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Cold-rolled DP980 steel is widely used in the automobile industry. Hot-rolled coil is the raw material of cold-rolled DP980 steel, the head and tail parts of which are usually obviously stronger than the body part. The objective of this study is to improve the longitudinal performance uniformity of hot-rolled coils. The material properties of this steel, such as the dynamic continuous cooling transformation, the influence of the cooling mode before coiling, the cooling rate during coil cooling on the microstructure, and mechanical properties of cold-rolled DP980 steel were investigated through thermal simulation experiments and hot rolling experiments. Meanwhile, the temperature field of hot-rolled coil was analyzed using ABAQUS software, which was used to survey the cause of the longitudinal performance fluctuations of hot-rolled coils, combined with an investigation of the aforementioned material properties. The results illustrate that the average cooling rate of the head and tail parts are higher than that of the body part during coil cooling, which causes the longitudinal performance fluctuation of hot-rolled coils. Based on the temperature field of hot-rolled coil, obtained by FEM, the parameters of the U-shaped cooling process were optimized and used in industrial applications.
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Marya, Manuel, Kathy Wang, Louis G. Hector, and Xiaohong Gayden. "Tensile-Shear Forces and Fracture Modes in Single and Multiple Weld Specimens in Dual-Phase Steels." Journal of Manufacturing Science and Engineering 128, no. 1 (August 30, 2005): 287–98. http://dx.doi.org/10.1115/1.2137751.

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In this article, weld fracture criteria based upon low strain rate (i.e., ε̇∼10−3-10−2s−1) tensile-shear tests of spot welds in dual-phase (DP) steels DP600, DP780, and DP980 are developed. Three empirical equations are inferred from least-squares root-fitting analyses of tensile-shear testing data. Building upon existing results in the literature, the first equation relates the tensile-shear force to the weld diameter. The second and third equations relate, respectively, a critical weld diameter and a critical tensile-shear force for interfacial fracture to the sheet thickness and hardness extrema in the heat-affected zone. These idealized equations can serve as the basis for further development of fracture criteria resembling material flow laws that account for higher strain rates and more complicated deformation paths. The effect of spot-weld placement in specific patterns or arrays on deformation and fracture behavior was also investigated to explore underlying effects from deformation field interactions between adjacent spot welds.
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Pan, Libo, Wen Tan, Wenqiang Zhou, and Junlin Wang. "Development of a DP980 steel with low cooling rate requirement." E3S Web of Conferences 245 (2021): 01003. http://dx.doi.org/10.1051/e3sconf/202124501003.

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DP980 is a promising light-weightening material in car body. To avoid high investment of strong cooling system, a new DP980 steel with low cooling rate requirement was developed. The mechanical properties and microstructure were analyzed under different manufacturing process. It could be concluded that the chemical composition design should be reasonable and of low cost to achieve both high strength and also austenite to martensite transformation at low cooling rate. Strength increased with coiling temperature decreasing during hot rolling, and higher annealing temperature and lower over aging temperature were favourable to higher strength. The austenite-martensite transforming could be completed at even lower rapid cooling rate of 20°C/s. Through optimized manufacturing process parameters, the new DP steel product with good mechanical properties could be obtained successfully, which provided a new option for normal production line to produce ultra high strength steel.
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Dissertations / Theses on the topic "DP980"

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Ridges, Christopher Shane. "Tool Life of Various Tool Materials When Friction Spot Welding DP980 Steel." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2502.

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In this study, friction spot welding was used to join DP980 steel sheet. Four different ultra-hard tool materials were used with the objective of determining which tool material produced the highest number of acceptable-strength welds. Three of the tools were composed of various mixtures of polycrystalline cubic Boron Nitride (PCBN), Tungsten, and Rhenium. These materials are referred to herein as Q60, Q70, and Q80, the "Qxx" designation denoting the percentage of the volume of the tool material composed of PCBN. The fourth tool tested was composed entirely of PCBN. The Q70 tool produced approximately 1100 welds of acceptable strength before average weld strength decreased below the acceptable value, and the Q60 tool produced approximately 600 welds of acceptable strength. The Q80 material did not produce any welds with strengths above the acceptable value. However, Q80 produced the greatest number of welds of consistent strength. The PCBN tool, being the hardest, also did not produce any welds of acceptable strength, and failed at 257 welds. This failure is presumed to be a result of a tool/parameter mismatch which caused excessive loads on the tool. This research revealed that the weld parameters and tool materials used in this study will not generally provide for feasibility of implementation in industry. Further advances in weld parameter selection, tool geometry, and tool materials will be necessary in order to make friction spot joining of high strength steels an economically viable option.
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Montesano, João Augusto. "Caracterização mecânica e microestrutural de um aço bifásico DP980 empregado na indústria automobilística. /." Guaratinguetá, 2019. http://hdl.handle.net/11449/181690.

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Orientador: Marcelo dos Santos Pereira
Resumo: O desenvolvimento dos aços avançados de alta resistência tem sido a principal estratégia por parte das siderúrgicas para atenderem às demandas das indústrias automobilísticas por um material que permita a redução de peso, diminuição do consumo de combustível e, simultaneamente, que possibilite uma melhora na resistência ao impacto e na segurança dos passageiros. Neste contexto, o aço bifásico apresenta grande potencial tecnológico de aplicação, principalmente em componentes estruturais, em virtude de suas propriedades mecânicas especiais, como alta resistência à tração, alta taxa de encruamento e muito boa ductilidade. No entanto, é necessário minimizar os problemas dimensionais provocados pelo efeito do retorno elástico (springback) durante a estampagem, assim como, as falhas durante o processamento. Este trabalho tem por objetivo caracterizar um aço bifásico da classe 1000 MPa (DP980), quanto à microestrutura e propriedades mecânicas. A caracterização microestrutural, por meio de técnicas de microscopia óptica e eletrônica de varredura, determinaram as fases presentes de maneira qualitativa e quantitativa, assim como suas morfologias, com o objetivo de correlacionar a microestrutura com as propriedades mecânicas. Evidenciou-se a presença de grãos alongados, acompanhando o sentido de laminação da chapa e uma fração volumétrica de martensita de 51,4%. As características em relação aos processos de estampagem foram estudadas por meio do ensaio de dobramento para determinar o r... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The development of advanced high strength steels (AHSS) has been the main strategy for steelmakers to meet the demands of the automotive industry for a material that reduces weight and fuel consumption, provides shock resistance and vehicle safety. Within this context, dual-phase steel (DP) shows great technological potential, mainly in structural parts, due to its special mechanical properties, such as high tensile strength, work hardening, and ductility. However, it is necessary to minimize the dimensional problems caused by springback during stamping, along with the processing failures. This work aims to characterize a 1000 MPa (DP980) dual-phase steel regarding its microstructure and mechanical properties. The microstructural characterization, through optical microscopy and scanning electron microscopy, determined the present phases in a qualitative and quantitative manner, as well as their morphologies, in order to correlate microstructure with mechanical properties. The presence of elongated grains, following the direction of lamination of the sheet, as well as a volumetric fraction of martensite of 51.4% were observed. Features of the stamping processes were examined through a bending test to determine the springback in samples submitted to bending punches with radii of 5 mm and 0.3 mm. The samples tested with the 5 mm radius punch show a strong springback in function of the high strength of the steel. With the 0.3 mm radius punch, the springback decreases significantl... (Complete abstract click electronic access below)
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Weickum, Britney. "Friction Bit Joining of 5754 Aluminum to DP980 Ultra-High Strength Steel: A Feasibility Study." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2789.

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In this study, the dissimilar metals 5754 aluminum and DP980 ultra-high strength steel were joined using the friction bit joining (FBJ) process. The friction bits were made using one of three steels: 4140, 4340, or H13. Experiments were performed in lap shear, T-peel, and cross tension configurations, with the 0.070" thick 5754 aluminum alloy as the top layer through which the friction bit cut, and the 0.065" thick DP980 as the bottom layer to which the friction bit welded. All experiments were performed using a computer controlled welding machine that was purpose-built and provided by MegaStir Technologies. Through a series of designed experiments (DOE), weld processing parameters were varied and controlled to determine which parameters had a significant effect on weld strength at a 95% confidence level. The parameters that were varied included spindle rotational speeds, Z-command depths, Z-velocity plunge rates, dwell times, and friction bit geometry. Maximum lap shear weld strengths were calculated to be 1425.4lbf and were to be obtained using a bit tip length at 0.175", tip diameter at 0.245", neck diameter at 0.198", cutting and welding z-velocities at 2.6"/min, cutting and welding RPMs at 550 and 2160 respectively, cutting and welding z-commands at -0.07" and -0.12" respectively, cooling dwell at 500 ms, and welding dwell at 1133.8 ms. These parameters were further refined to reduce the weld creation time to 1.66 seconds. These parameters also worked well in conjunction with an adhesive to form weld bonded samples. The uncured adhesive had no effect on the lap shear strengths of the samples. Using the parameters described above, it was discovered that cross tension and T-peel samples suffered from shearing within the bit that caused the samples to break underneath the flange of the bit during testing. Visual inspection of sectioned welds indicated the presence of cracking and void zones within the bit.
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Sederstrom, Jack H. "Spot Friction Welding of Ultra High-Strength Automotive Sheet Steel." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/842.

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Spot friction welding (SFW) was performed on ultra high strength steel (UHSS) steel sheet commonly used in automobile manufacturing. Alloys studied included DP780, DP780EG, DP980, and DF140T sheet steel of varying thickness from 1.2 mm to 1.4 mm. Welding was accomplished using a PCBN standard tool. Weld strengths were then compared to a proposed AWS standard. Initial hardness readings were taken in cross sectioned samples. Grain structure in a SFW is presented. Resistance spot welds were created in three steels. This study focuses on the strength of SFW joints as compared to traditional resistance spot welding (RSW) in welding like materials to one another. Cycle times of SFW were also evaluated and compared to production rate cycle times of RSW.
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Peterson, Rebecca Hilary. "Friction Bit Joining of Dissimilar Combinations of DP 980 Steel and AA 7075." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/6030.

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Friction Bit Joining (FBJ) is a new technology that allows lightweight metals to be joined to advanced high-strength steels (AHSS). Joining of dissimilar metals is especially beneficial to the automotive industry because of the desire to use materials such as aluminum and AHSS in order to reduce weight and increase fuel efficiency. In this study, FBJ was used to join 7075 aluminum and DP980 ultra-high-strength steel. FBJ is a two-stage process using a consumable bit. In the first stage, the bit cuts through the top material (aluminum), and in the second stage the bit is friction welded to the base material (steel). The purpose of the research was to examine the impact a solid head bit design would have on joint strength, manufacturability, and ease of automation. The solid head design was driven externally. This design was compared to a previous internally driven head design. Joint strength was assessed according to an automotive standard established by Honda. Joints were mechanically tested in lap-shear tension, cross-tension, and peel configurations. Joints were also fatigue tested, cycling between loads of 100 N and 750 N. The failure modes that joints could experience during testing include: head, nugget, material, or interfacial failure. All tested specimens in this research experienced interfacial failure. Welds were also created and examined under a microscope in order to validate a simulation model of the FBJ process. The simulation model predicted a similar weld shape and bond length with 5 percent accuracy. Joints made with external bits demonstrated comparable joint strength to internal bits in lap-shear tension and cross-tension testing. Only external bits were tested after lap-shear tension, because it was determined that external bits would perform comparably to internal bits. Joints made with external bits also exceeded the standard for failure during fatigue testing. Peel tested specimens did not meet the required strength for the automotive standard. Examining specimens under a microscope revealed micro-cracks in the weld. These defects have been shown to decrease joint strength. Joint strength, especially during peel testing, could be increased by reducing the presence of micro-cracks. The external bit design is an improvement from the internal bits for manufacturability and ability to be automated, because of the less-expensive processes used to form the bit heads and the design that lends to ease of alignment.
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Hartman, Trent J. "Friction Stir Spot Welding of Ultra-High Strength Steel." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3302.

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Friction stir spot welding (FSSW) is quickly becoming a method of interest for welding of high strength steel (HSS) and ultra high strength steel (UHSS). FSSW has been shown to produce high quality welds in these materials, without the drawbacks associated with fusion welding. Tool grade for polycrystalline cubic boron nitride (PCBN) tools has a significant impact on wear resistance, weld quality, and tool failure in FSSW of DP 980 steel sheet. More specifically, for a nominal composition of 90% CBN, the grain size has a significant impact on the wear resistance of the tool. A-type tools performed the best, of the three grades that were tested in this work, because the grain size of this grade was the finest, measuring from 3-6 microns. The effect of fine grain size was less adhesion of DP 980 on the tool surface over time, less abrasive wear, and better lap shear fracture loads of the welds that were produced, compared to the other grades. This is explained by less exposure of the binder phase to wear by both adhesion and abrasion during welding of DP 980. A-type tools were the most consistent in both the number of welds per tool, and the number of welds that reached acceptable lap shear fracture loads. B-type tools, with a bimodal grain size distribution (grain size of 4 – 40 microns) did a little bit better than C-type tools (grain size of 12-15 microns) in terms of wear, but neither of them were able to achieve consistent acceptable lap shear fracture load values after the first 200 welds. In fact only one out of five C-type tools was able to produce acceptable lap shear fracture loads after the first 100 welds.
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Squires, Lile P. "Friction Bit Joining of Dissimilar Combinations of Advanced High-Strength Steel and Aluminum Alloys." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4104.

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Friction bit joining (FBJ) is a new method that enables lightweight metal to be joined to advanced high-strength steels. Weight reduction through the use of advanced high-strength materials is necessary in the automotive industry, as well as other markets, where weight savings are increasingly emphasized in pursuit of fuel efficiency. The purpose of this research is twofold: (1) to understand the influence that process parameters such as bit design, material type and machine commands have on the consistency and strength of friction bit joints in dissimilar metal alloys; and (2) to pioneer machine and bit configurations that would aid commercial, automated application of the system. Rotary broaching was established as an effective bit production method, pointing towards cold heading and other forming methods in commercial production. Bit hardness equal to the base material was found to be highly critical for strong welds. Bit geometry was found to contribute significantly as well, with weld strength increasing with larger bit shaft diameter. Solid bit heads are also desirable from both a metallurgical and industry standpoint. Cutting features are necessary for flat welds and allow multiple material types to be joined to advanced high-strength steel. Parameters for driving the bit were established and relationships identified. Greater surface area of contact between the bit and the driver was shown to aid in weld consistency. Microstructure changes resulting from the weld process were characterized and showed a transition zone between the bit head and the bit shaft where bit hardness was significantly increased. This zone is frequently the location of fracture modes. Fatigue testing showed the ability of FBJ to resist constant stress cycles, with the joined aluminum failing prior to the FBJ fusion bond in all cases. Corrosion testing established the use of adhesive to be an effective method for reducing galvanic corrosion and also for protecting the weld from oxidation reactions.
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Srinivasan, Ganapathy. "Flanging and Bending of Advanced High Strength Steels." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408716079.

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Caetano, Rodrigo Alves. "Avaliação da conformabilidade do Aço Transformation Induced Plasticity (TRIP780) eletrogalvanizado e Dual Phase (DP780) galvanizado por imersão a quente." Universidade Federal de Minas Gerais, 2015. http://hdl.handle.net/1843/BUBD-9WUJJS.

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The Usiminas, largest Latin American steel supplier of flat steel, has dedicated great efforts for different demands of the market, investing in production facilities and developing new steels for use in vehicles body. The present study has the objective to evaluate the metallurgical behavior of high-strength steels, DP780 hot dip galvanized and TRIP780 electrogalvanized, based on their mechanical properties, metallographic constitution, formability, hole expansion, bake hardening and aging index. The TRIP780 steel showed an excellent formability. The tests results showed a significantly superior performance to the DP780 steel, with the same strength class and thickness in every modes of stamping evaluated, and excellent bake hardening effect, which can providing a further increase in the mechanical strength of the final manufactured components. It is therefore an excellent choice for use in body parts, especially in components requiring higher strength.
A Usiminas, maior siderúrgica latino-americana fornecedora de aços planos, tem dedicado grandes esforços para oferecer materiais mais adequados para as diferentes demandas do mercado, desenvolvendo novos tipos de aços para utilização em carrocerias veiculares. O objetivo deste estudo foi caracterizar o comportamento metalúrgico do aço DP780 Galvanizado por Imersão a Quente com revestimento de zinco puro e do aço TRIP780 Eletrogalvanizado, com base em análises metalográficas, ensaios de tração, ensaios de estampagem, ensaios Bake Hardening (BH) e Aging Index (AI). Ambos os aços possuem espessura nominal de 1,50 mm. Os resultados dos ensaios realizados mostraram que o aço TRIP780 apresenta desempenho significativamente superior ao do aço DP780 em todos os modos de estampagem avaliados, além de boa capacidade de endurecimento após pintura (efeito BH), o que proporciona um aumento na resistência mecânica final dos componentes fabricados. Tanto o aço TRIP780 como o DP780 são opções para aplicação em peças da carroceria, principalmente em componentes que requeiram elevada resistência mecânica. A influência do revestimento não foi abordada nesse estudo.
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Hsu, Kai-Chieh, and 許凱傑. "Distortion Reduction for Curved Hat Channel of AHSS(DP980)." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5cvj99.

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碩士
國立臺灣大學
機械工程學研究所
105
As the global warming becomes worse and the environmental consciousness rises, AHSS has been widely used as the material of automobile structural parts. However, as the strength of steels increases, stamping defects such as sidewall curl and distortion become worse. This study investigates the distortion in sheet metal forming. A-pillar is an automobile structural part. Among all automobile structural parts, A-pillar is most likely to be distorted. This study induces the geometric parameters of A-pillar. This study also establishes a model for curved hat channel which has similar geometry with the A-pillar and uses PAM-STAMP to simulate the stamping process with the established model. This study investigates the formability influenced by different geometric parameters. The result can be the reference for A-pillar design. Next, this study simulates the distortion defects influenced by different geometric parameters. By studying the stress distribution on different cases, the mechanism of distortion can be discussed. Furthermore, strategies, like drawbead and die compensation, are used to reduce distortion. This study proposes two die compensation methods for distortion which solve the problem that punch have no space to stamp after compensation. The result in reducing distortion is significant, from 9 degrees to 1.5 degrees. At last, a curved hat channel die has been designed.
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Book chapters on the topic "DP980"

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Cho, K., K. V. Redkin, M. Hua, C. I. Garcia, and A. J. DeArdo. "Recent Development of Nb-Containing DP590, DP780 and DP980 Steels for Production on Continuous Galvanizing Lines." In Advanced Steels, 177–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17665-4_19.

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Han, Yun, Shuang Kuang, Xiumei Qi, Chunqian Xie, and Guanghui Liu. "Research on the Microstructures and Mechanical Properties of Ti Micro-Alloyed Cold Rolled Hot-Dip Galvanizing Dp980 Steel." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 565–70. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119223399.ch68.

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Han, Yun, Shuang Kuang, Xiumei Qi, Chunqian Xie, and Guanghui Liu. "Research on the Microstructures and Mechanical Properties of Ti Micro-Alloyed Cold Rolled Hot-Dip Galvanizing DP980 Steel." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 565–70. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48767-0_68.

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Conference papers on the topic "DP980"

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Chen, X. M., M. F. Shi, G. Chen, M. Kamura, K. Watanabe, and Y. Omiya. "Crash Performances of Advanced High Strength Steels of DP780, TRIP780 and DP980." In SAE 2005 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-01-0354.

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Shih, Hua-Chu, Changqing Du, and Dajun Zhou. "Die Wear and Galling in Stamping DP980 Steel." 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/msec2013-1142.

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Stamping of dual phase (DP) 980 steel creates higher deformation heat, contact pressure and friction force between the tooling and sheet steel. These, in turn, cause higher die wear and galling. Although various countermeasures have been adopted in production to prevent excessive wear associated with forming DP980 steel, the stamping die tryout process has not been revised accordingly to ensure that the die surfaces in contact with sheet metal have been hardened and coated. The effects of die hardness and lubrication conditions on die wear and galling in stamping DP980 steel during the die tryout process were evaluated at different contact pressures using the bending under tension (BUT) tester. A reciprocal cyclic bend test system (CBTS) of modifying bending under tension test was used to investigate wear and galling between a die in the tryout phase and in a production condition. The results indicate that the hardness of the die material dominates the galling and wear behavior in the die tryout phase. A better surface treated die material and an anti-galling strategy was also identified to decrease galling and wear in both die tryout and production.
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Choi, Kyoo Sil, Ayoub Soulami, Dongsheng Li, Xin Sun, Moe Khaleel, Le Xu, and Frederic Barlat. "Relationship between Material Properties and Local Formability of DP980 Steels." In SAE 2012 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2012. http://dx.doi.org/10.4271/2012-01-0042.

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Yao, Z. Connie. "Die Wear Evaluation for Stamping TRIP700 and DP980 B-Pillar." In SAE 2011 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2011. http://dx.doi.org/10.4271/2011-01-0038.

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Jiao, Yuqin, Hongxin Zhang, and Wei Xu. "Study of fiber laser welding for DP980 high strength steel." In 5th International Conference on Advanced Design and Manufacturing Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icadme-15.2015.98.

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Bhattacharya, S., D. E. Green, R. Sohmshetty, and A. T. Alpas. "Microstructural investigations of the trimmed edge of DP980 steel sheets." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF GLOBAL NETWORK FOR INNOVATIVE TECHNOLOGY AND AWAM INTERNATIONAL CONFERENCE IN CIVIL ENGINEERING (IGNITE-AICCE’17): Sustainable Technology And Practice For Infrastructure and Community Resilience. Author(s), 2017. http://dx.doi.org/10.1063/1.5008113.

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Verma, Rahul K., Nobuyasu Noma, Kwansoo Chung, and Toshihiko Kuwabara. "Draw-Bending Analysis of a Cold Rolled DP980 Steel Sheet." In THE 14TH INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2011. AIP, 2011. http://dx.doi.org/10.1063/1.3589713.

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Koganti, Ramakrishna, Sergio Angotti, Arnon Wexler, and Donald F. Maatz. "Resistance Spot Welding (RSW) Process Optimization for Uncoated 2.0mm Dual Phase 780 to 2.0 mm Uncoated 2.0 mm Dual Phase 780 (DP780) Steel for Automotive Applications." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68579.

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There has been a substantial increase in the use of advanced high strength steel in automotive structures in the last few years. The usage of these materials is projected to grow significantly in the next 5–10 years with new safety and fuel economy regulations. Advanced High Strength Steels (AHSS) are getting popular with superior mechanical properties and weight advantages compared to mild steel materials. These new materials have significant manufacturing challenges, particularly for welding and stamping. Proper understanding of the weldability of these materials is critical for successful application in future vehicle programs. Due to high strength nature of AHSS materials, higher weld forces and longer weld times are needed to weld AHSS materials. This work is in support of lightweight structures development and during the weld development phase various gages of coated and uncoated AHSS materials (DP780, DP980, TRIP780, Boron, Algoma 700B) were investigated. Both 2T and 3T stack-up conditions were investigated. Also, some combination of AHSS materials with High Strength Low Alloy (HSLA) and Bake Hardenable 210 (BH210) electro galvanized (EG) steels were also investigated. In this paper, weld lobe development for 2.0 mm DP780 bare to 2.0 mm DP780 bare 2T stack-up combination is discussed. Weld lobes were developed with Mid Frequency Direct Current (MFDC) equipment, ISO type B-20 tip, constant weld force of 6.36 kN (1430 lbf), hold time of 5 cycles and the weld times were varied 21, 24 and 27 cycles. Based on the tensile, cross-tension and nugget data, there were no correlations were observed between tensile load and button size and also between cross-tension and button size. Weld cross section data indicated heat affected zone (HAZ) at the weld nugget area and hardness drop of 17% was observed at the HAZ area. Irrespective of weld cycles, similar HAZ was observed close to the weld nugget. The weld lobes, mechanical properties (tensile shear and cross tension), cross-section examination, and microhardness of 2.0 mm DP780 bare to 2.0 mm DP780 bare weld 2T stack-up results are discussed.
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Drumond, Juliovany, Flávio José Saraiva Rodrigues, Gabriel Godinho Alves, Gladistone de Souza Guerra, and Fabrício Moreira Cerqueira. "EFEITO DA ADIÇÃO DE BORO NO AÇO BIFÁSICO DP980 NA ARCELORMITTAL BRASIL." In 51º Seminário de Laminação - Processos e Produtos Laminados e Revestidos - Internacional. São Paulo: Editora Blucher, 2014. http://dx.doi.org/10.5151/1983-4764-25247.

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Xia, Mingsheng, Michael L. Kuntz, Zhiling Tian, and Y. Norman Zhou. "Failure mechanism of laser welds of DP980 and HSLA450 steels in formability testing." In PICALO 2008: 3rd Pacific International Conference on Laser Materials Processing, Micro, Nano and Ultrafast Fabrication. Laser Institute of America, 2008. http://dx.doi.org/10.2351/1.5056991.

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