Relevant bibliographies by topics / Advanced high strength steel; Quenching and partitioning

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Advanced high strength steel; Quenching and partitioning'

Author: Grafiati
Published: 4 June 2025
Last updated: 14 July 2025

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Journal articles on the topic "Advanced high strength steel; Quenching and partitioning"

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Kučerová, L., H. Jirková, and B. Mašek. "The Effect of Alloying on Mechanical Properties of Advanced High Strength Steels." Archives of Metallurgy and Materials 59, no. 3 (2014): 1189–92. http://dx.doi.org/10.2478/amm-2014-0206.

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Abstract Quenching and partitioning process with incorporated incremental deformation was optimized for six high strength steels with various contents of carbon (0.4-0.6%), manganese (0.6-1.2), silicon (2-2.6%) and chromium (0.8-1.3%). The optimization was gradually done for each steel with respect to the final microstructures and properties. The effect of cooling rate, quenching and partitioning temperature on microstructure development was further investigated. Interesting combinations of mechanical properties were obtained, with tensile strength in the region of 1600-2400 MPa and ductility of 6-20%.
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Wang, Yilin, Huicheng Geng, Bin Zhu, Zijian Wang, and Yisheng Zhang. "Carbon Redistribution and Microstructural Evolution Study during Two-Stage Quenching and Partitioning Process of High-Strength Steels by Modeling." Materials 11, no. 11 (2018): 2302. http://dx.doi.org/10.3390/ma11112302.

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The application of the quenching and partitioning (Q-P) process on advanced high-strength steels improves part ductility significantly with little decrease in strength. Moreover, the mechanical properties of high-strength steels can be further enhanced by the stepping-quenching-partitioning (S-Q-P) process. In this study, a two-stage quenching and partitioning (two-stage Q-P) process originating from the S-Q-P process of an advanced high-strength steel 30CrMnSi2Nb was analyzed by the simulation method, which consisted of two quenching processes and two partitioning processes. The carbon redistribution, interface migration, and phase transition during the two-stage Q-P process were investigated with different temperatures and partitioning times. The final microstructure of the material formed after the two-stage Q-P process was studied, as well as the volume fraction of the retained austenite. The simulation results indicate that a special microstructure can be obtained by appropriate parameters of the two-stage Q-P process. A mixed microstructure, characterized by alternating distribution of low carbon martensite laths, small-sized low-carbon martensite plates, retained austenite and high-carbon martensite plates, can be obtained. In addition, a peak value of the volume fraction of the stable retained austenite after the final quenching is obtained with proper partitioning time.
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Penha, Renata Neves, and Yago Francisco Soares Marins. "Quenching and partitioning heat treatment: the third generation of advanced high-strength steel." Research, Society and Development 11, no. 10 (2022): e346111031903. http://dx.doi.org/10.33448/rsd-v11i10.31903.

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This manuscript aims to present an overview of quenching and partitioning (Q&P) heat treatment usually applied to transformation-induced plasticity (TRIP) and duplex steels (DP). TRIP and DP are the first generations of advanced high-strength steels (AHSS). AHSSs present multiphase microstructures that ensure an advantageous combination of strength and ductility. The Q&P heat treatment process aims to obtain a mixed microstructure with martensite and retained austenite and improve the relation strength/ductility of common AHSS. The retained austenite of Q&P steels is rich in carbon and stable at room temperature. The heat treatment process implicates quenching the steel between the martensite-start (Ms) and martensite-finish (Mf) temperatures, followed by partitioning. Partitioning is an isothermal heat treatment that occurs above the Ms temperature. A diffusion process enriches the remaining austenite with carbon that migrates from martensite. The stability of retained austenite at room temperature improves the mechanical performance of steel, once it increases the material’s toughness and elongation. The optimal control of microstructure originates the third generation of AHSS and enables to reduce of weight and improved mechanical response of automotive parts made of the TRIP and DP steels.
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Zhang, Kai, Shang Wen Lu, Yao Hui Ou, Xiao Dong Wang, and Ning Zhong. "Microstructure and Mechanical Properties of a Nb-Microalloyed Medium Carbon Steel Treated by Quenching-Partitioning Process." Key Engineering Materials 531-532 (December 2012): 596–99. http://dx.doi.org/10.4028/www.scientific.net/kem.531-532.596.

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The recently developed “quenching and partitioning” heat treatment and “quenching-partitioning-tempering” heat treatment are novel processing technologies, which are designed for achieving advanced high strength steels (AHSS) with combination of high strength and adequate ductility. In present study, a medium carbon steel containing Nb was subjected to the Q-P-T process, and both the microstructure and mechanical properties was studied. The experimental results show that the Nb-microalloyed steel demonstrates high tensile strength and relatively high elongation. The microstructure of the steel was investigated in terms of scanning electron microscope and transmission electron microscope, and the results indicate that the Q-P-T steel consist of fine martensite laths with dispersive carbide precipitates and the film-like interlath retained austenite. The orientation relationships between martensite and retained austenite is as well-known Kurdjurmov-Sachs relationship and Nishiyama-Wasserman relationship.
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Zhong, Ning, Songpu Yang, Tao Liu, et al. "Effects of Compositional Inhomogeneity on the Microstructures and Mechanical Properties of a Low Carbon Steel Processed by Quenching-Partitioning-Tempering Treatment." Crystals 13, no. 1 (2022): 23. http://dx.doi.org/10.3390/cryst13010023.

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Quenching-partitioning-tempering (Q-P-T) heat treatment is a relatively novel approach to attain excellent ductility in high-strength steels. In the present work, the microstructural evolution and the mechanical properties of a low carbon microalloyed advanced steel were systematically investigated after the Q-P-T process. The microstructural evolution was explored by employing X-ray diffraction, transmission electron microscopy and scanning electron microscopy. The results indicate that the multiphase microstructures strongly depend on both the initial microstructure and the processing parameters of the quenching and partitioning process, especially the quenching temperature. Compositional inhomogeneity during the Q-P-T process results in multiphase microstructures, in which the mechanical properties of the quenching and partitioning steels may be strongly impacted by the distribution of heterogeneous austenite phase in the steel matrix.
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Sabirov, Ilchat, María J. Santofimia, and Roumen H. Petrov. "Advanced High-Strength Steels by Quenching and Partitioning." Metals 11, no. 9 (2021): 1419. http://dx.doi.org/10.3390/met11091419.

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Quenched and partitioned (Q&P) steels are recently developed materials with carefully selected chemical compositions and multiphase microstructures resulting from precisely controlled heating and cooling processes [...]
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Rizzo, F. C., A. R. Martins, John G. Speer, David K. Matlock, A. Clarke, and Bruno C. De Cooman. "Quenching and Partitioning of Ni-Added High Strength Steels." Materials Science Forum 539-543 (March 2007): 4476–81. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.4476.

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High strength steels containing significant fractions of retained austenite have been developed in recent years, and are the subject of growing commercial interest when associated with the TRIP phenomenon during deformation. A new process concept “quenching and partitioning” (Q&P) has been proposed by CSM/USA, and the results show the potential to create a new kind of steel microstructure with controlled amounts of retained austenite, enriched by carbon partitioning. Four steels containing C, Si, Mn, Ni, Cr and Mo, were designed with variation in the Ni and C content, aiming to decrease Bs temperature and to suppress carbide formation during the partitioning treatment. Several heat-treatment procedures were performed in specimens previously machined for tensile testing, while x-ray diffraction was used to determine the fraction of retained austenite. The tensile test results showed that except for the high C high Ni alloy, most of the processing conditions resulted in strengths superior to those of advanced high strength steels (AHSS), although it is importantly recognized that higher alloy additions were used in this study, in comparison with conventional AHSS grades.. A variety of strength and ductility combinations were observed, confirming the potential of the Q&P process and illustrating the strong influence of the final microstructure on the mechanical properties. Experimental results for samples partitioned at 400 °C indicate that higher ultimate tensile strength is associated with higher fraction of retained austenite for multiple heat treatments of each alloy investigated. The amount of retained austenite obtained was generally lower than that predicted by the model. Further studies are in progress to understand the influence of alloying and processing parameters (time/temperature) on the partitioning of carbon and precipitation of transition carbides.
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Wang, Ying, Shu Zhou, Zheng Hong Guo, and Yong Hua Rong. "Study of a Novel Ultra-High Strength Steel with Adequate Ductility and Toughness by Quenching-Partitioning-Tempering Process." Materials Science Forum 654-656 (June 2010): 37–40. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.37.

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According to the design principle of microstructures for high strength steel and a new quenching-partitioning-tempering (Q-P-T) process recently proposed by Hsu, a microalloying Fe-Mn-Si base steel by the Q-P-T process has been designed. The results indicate that the Q-P-T steel exhibits ultra-high tensile strength combining with good ductility and toughness, and it is a new family of advanced high-strength steels. The microstructures of samples by different Q-P-T processes were characterized by means of optical microscopy, scanning electron microscopy, X-ray diffraction and transmission electron microscopy, and the relation between microstructures and mechanical properties was analyzed
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Carpio, Marcel, Jessica Calvo, Omar García, Juan Pablo Pedraza, and José María Cabrera. "Heat Treatment Design for a QP Steel: Effect of Partitioning Temperature." Metals 11, no. 7 (2021): 1136. http://dx.doi.org/10.3390/met11071136.

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Designing a new family of advanced high-strength steels (AHSSs) to develop automotive parts that cover early industry needs is the aim of many investigations. One of the candidates in the 3rd family of AHSS are the quenching and partitioning (QP) steels. These steels display an excellent relationship between strength and formability, making them able to fulfill the requirements of safety, while reducing automobile weight to enhance the performance during service. The main attribute of QP steels is the TRIP effect that retained austenite possesses, which allows a significant energy absorption during deformation. The present study is focused on evaluating some process parameters, especially the partitioning temperature, in the microstructures and mechanical properties attained during a QP process. An experimental steel (0.2C-3.5Mn-1.5Si (wt%)) was selected and heated according to the theoretical optimum quenching temperature. For this purpose, heat treatments in a quenching dilatometry and further microstructural and mechanical characterization were carried out by SEM, XRD, EBSD, and hardness and tensile tests, respectively. The samples showed a significant increment in the retained austenite at an increasing partitioning temperature, but with strong penalization on the final ductility due to the large amount of fresh martensite obtained as well.
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Paul, Georg, and Richard G. Thiessen. "Modeling and Simulation of Q&P Steels." Materials Science Forum 879 (November 2016): 1454–58. http://dx.doi.org/10.4028/www.scientific.net/msf.879.1454.

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Two important objectives of the automotive industry are the decrease of the body-in-white weight and the improvement of the passenger safety. High strength steels (HSS) are widely used to achieve these objectives. Quenching and partitioning (Q&P) has recently been proposed to achieve high strength steel grades for the third generation of advanced high strength steels (AHSS), which contain a considerable amount of retained austenite. Due to their microstructure these new steel grades combine a high tensile strength with good elongation values, as long as cementite precipitation is avoided. A model describing the involved phase transformations is presented. Special focus is put on the cementite precipitation and how it is influenced by silicon and aluminum additions.
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Dissertations / Theses on the topic "Advanced high strength steel; Quenching and partitioning"

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Laarich, Abdellatif. "Designing a Heat Treatment to Achieve Ductile Advanced High Strength Steels." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79754.

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Heat treatment is a way to significantly change materials properties. When presented with materials that lack certain mechanical properties, it is possible to change its chemical properties and microstructures by applying heat. This can help achieve better yield strength, ductility and toughness. This project discusses the effects of multiple distinct heat treatment methods for several materials in order to improve ductility and elongation without diminishing strength. The materials in question are High Aluminum Steel and Strenx 700MC steel, the first being under development and the second being a commercially available steel. These steels show promise to be used as high ductility, high strength, and 3rd generation steels. The heat treatments can change the mechanical proprieties of the base materials in order to optimize these steels for applications in vertical access solutions. The heat treatments in this project were Quenching and Partitioning (QP), Quenching and Tempering (QT), Austempering (AUST), Intercritical Heat Treatment (IHT) and other usual heat treatments such as Double normalizing (D-Norm). First, the most beneficial type of the above mentioned heat treatments was selected for each steel and series of heat treatments were performed in order to identify and optimize the best method for each steel. Then, heat treated samples underwent a series of tests to numerically quantify their properties and compare them to the existing steels in Alimak’s applications. The results show that Quenching and Partitioning is the most promising heat treatment for optimizing strength and ductility in High Aluminum Steel, with elongation values up to 19% together with yield strengths of 700 MPa. For Strenx 700MC a combination of temperature and time was found that gave an elongation of above 25% with a yield strength of 450 MPa. The explanation for the good properties was partly grain refinement and phase transformations during heat treatments.
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Kroll, Martin, Peter Birnbaum, Josephine Zeisig, Verena Kraeusel, and Martin Franz-Xaver Wagner. "Manufacturing of 42SiCr-Pipes for Quenching and Partitioning by Longitudinal HFI-Welding." MDPI AG, 2019. https://monarch.qucosa.de/id/qucosa%3A34778.

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In the pipe manufacturing and pipe processing industry, the demand for cost-effective pipes with high strength and good ductility is increasing. In the present study, the inductive longitudinal welding process was combined with a Quenching and Partitioning (Q&P) treatment to manufacture pipes with enhanced mechanical properties. The aim of the Q&P process is to establish a martensitic structure with increased retained austenite content. This allows for the beneficial use of both phases: the strength of martensite as well as the ductility of retained austenite. A 42SiCr steel, developed for Q&P processes, was joined at the longitudinal seam by a high-frequency induction (HFI) welding process and was subsequently heat-treated. The applied heat treatments included normalizing, austenitizing, quenching, and two Q&P strategies (Q&P-A/Q&P-B) with distinct quenching (Tq = 200/150 °C) and partitioning temperatures (Tp = 300/250 °C). Investigations of the microstructures revealed that Q&P tubes exhibit increased amounts of retained austenite in the martensitic matrix. Differences between the weld junction and the base material occurred, especially regarding the morphology of the martensite; the martensite found in the weld junction is finer and corresponds more to the lath-type morphology, compared to the base material in the circumference. In all zones of the welded tube circumference, retained austenite has been found in similar distributions. The mechanical testing of the individual tubes demonstrated that the Q&P treatments offer increased strength compared to all other states and significantly improved ductility compared to the quenched condition. Therefore, the approach of Q&P treatment of HFI-welded tubes represents a route for the mass production of high-strength tubular products with improved ductility.
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Qu, Hao. "ADVANCED HIGH STRENGTH STEEL THROUGH PARAEQUILIBRIUM CARBON PARTITIONING AND AUSTENITE STABILIZATION." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1346250505.

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Qu, Hao. "Advanced High Strength Steel Through Paraequilibrium Carbon Partitioning and Austenite Stabilization." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1283353953.

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Book chapters on the topic "Advanced high strength steel; Quenching and partitioning"

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Hsu, T. Y., and Xuejun Jin. "Ultra-high Strength Steel Treated by Using Quenching–Partitioning–Tempering Process." In Advanced Steels. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17665-4_8.

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Shen, Fuhui, Yannik Sparrer, Guijia Li, and Sebastian Münstermann. "Prediction of Fracture Behavior in a Quenching and Partitioning Steel Under Different Stress States." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-58006-2_23.

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AbstractIncreasing research efforts have been devoted to the development of quenching and partitioning (Q&P) steel, which is considered to be a very promising representative of the third generation of advanced high-strength steel (AHSS). The excellent tensile properties achieved by the novel Q&P treatment make it a potential material to manufacture structural components in automotive industries. In addition to tensile strength and ductility, the formability and fracture properties of Q&P steels shall be thoroughly investigated under different stress states. Therefore, the deformation and fracture properties of a laboratory Q&P steel have been investigated by conducting a comprehensive experimental program and the corresponding finite element simulations. Tensile tests have been performed using flat specimens with different notch configurations to achieve a very wide range of loading conditions. In addition, the deformation and fracture behavior during different experiments have been simulated using finite element methods and damage mechanics approaches. After collecting the critical stress and strain variables from simulation results, a stress state-dependent fracture criterion has been calibrated and validated to characterize the fracture resistance of the Q&P steel in this study.
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Zhong, Ning, Xiaodong Wang, and Na Min. "Microstructual Evolution of a Medium Carbon Advanced High Strength Steel Heat-Treated by Quenching-Partitioning Process." In Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing. Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48764-9_109.

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Zhong, Ning, Xiaodong Wang, and Na Min. "Microstructual Evolution of a Medium Carbon Advanced High Strength Steel Heat-Treated by Quenching-Partitioning Process." In PRICM. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118792148.ch109.

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Edmonds, David, David Matlock, and John Speer. "Developments in High Strength Steels with Duplex Microstructures of Bainite or Martensite with Retained Austenite: Progress with Quenching and Partitioning Heat Treatment." In Advanced Steels. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17665-4_24.

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Dieck, Sebastian, Martin Ecke, Paul Rosemann, Sebastian Fritsch, Martin Franz-Xaver Wagner, and Thorsten Halle. "Strength Differential Effect in Martensitic Stainless Steel Under Quenching and Partitioning Heat Treatment Condition." In Plasticity, Damage and Fracture in Advanced Materials. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-34851-9_3.

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Driver, Robert G., Gilbert Y. Grondin, and Colin MacDougall. "Fatigue Research on High-Performance Steels in Canada." In Use and Application of High-Performance Steels for Steel Structures. International Association for Bridge and Structural Engineering (IABSE), 2005. http://dx.doi.org/10.2749/sed008.045.

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<p>Compared to conventional structural grade steels, high-performance steel (HPS) pro­vides higher strength, improved weldability, greatly enhanced fracture toughness, and comparable ductility, as well as having "weathering" properties. The improved char­acteristics of HPS are achieved through lower levels of carbon and other elements, in conjunction with advanced steel-making practices using either quenching and tem­pering or thermo-mechanical controlled processing. All of these properties make HPS highly desirable for bridge applications. Indeed, although its development spans only the past decade, it is rapidly gaining popularity for use in highway bridges and is be­coming more widely available. Although many highway bridges have already been put into service in the United States, Canada has yet to implement this technology in bridges. Nevertheless, it is anticipated that the use ofHPS will become common in the Canadian market in the near future.</p>
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"Evolving Grades of Advanced High-Strength Steels." In Advanced High-Strength Steels: Science, Technology, and Applications, Second Edition. ASM International, 2024. http://dx.doi.org/10.31399/asm.tb.ahsssta2.t59410293.

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Abstract This chapter summarizes the microstructural basis of conventional high-strength steels (HSS) and the three generations of advanced high-strength steels (AHSS). It presents the requirements of a third generation advanced high-strength steel and its microstructural design. The chapter also includes a discussion about novel AHSS processing routes: quenching, partitioning, and double-stabilization thermal cycling.
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Jin, Xuejun. "Quenching and Partitioning Heat Treatment: High-Strength, Low-Alloy." In Encyclopedia of Iron, Steel, and Their Alloys. CRC Press, 2016. http://dx.doi.org/10.1081/e-eisa-120051355.

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"Martensitic Steels." In Advanced High-Strength Steels: Science, Technology, and Applications, Second Edition. ASM International, 2024. http://dx.doi.org/10.31399/asm.tb.ahsssta2.t59410139.

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Abstract Martensitic (MS) steel is produced by quenching carbon steel from the austenitic phase into martensite. This chapter presents the compositions, microstructures, processing, deformation mechanism, mechanical properties, hot forming process, and attributes of MS steels.
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Conference papers on the topic "Advanced high strength steel; Quenching and partitioning"

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Wang, Z. J., H. C. Geng, S. Q. Li, et al. "Effect of Load Histories on the Quenching and Partitioning Process." In 4th International Conference on Advanced High Strength Steel and Press Hardening (ICHSU2018). WORLD SCIENTIFIC, 2018. http://dx.doi.org/10.1142/9789813277984_0028.

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Gruttadauria, A., C. Liu, C. Mapelli, et al. "Comprehensive Analysis on Quenching and Partitioning on a 30MnV6 Microalloyed Steel." In International Symposium on New Developments in Advanced High-Strength Sheet Steels. Association for Iron & Steel Technology, 2023. http://dx.doi.org/10.33313/298/005.

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Jing, C. N., Z. H. Xing, Y. M. Tu, X. Y. Ding, and F. Guo. "Theoretical Study of the Carbon Content of Retained Austenite After Quenching-partitioning." In 4th International Conference on Advanced High Strength Steel and Press Hardening (ICHSU2018). WORLD SCIENTIFIC, 2018. http://dx.doi.org/10.1142/9789813277984_0029.

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Dong, Z. D., P. X. Liu, B. Zhu, Y. L. Wang, and Y. S. Zhang. "Making Uniform Quenching and Partitioning Treatment During Hot Stamping Process." In The 2nd International Conference on Advanced High Strength Steel and Press Hardening (ICHSU 2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813140622_0074.

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Liu, P. X., Z. D. Dong, K. Wang, B. Zhu, Y. L. Wang, and Y. S. Zhang. "Key Problem of Hot Stamping Process with Quenching and Partitioning Treatment." In The 2nd International Conference on Advanced High Strength Steel and Press Hardening (ICHSU 2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813140622_0073.

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Gruttadauria, A., C. Mapelli, E. Castrodeza, et al. "Application of Quenching and Partitioning Treatment and Its Effect on Initiation Fracture Toughness in AISI 4140 Steel." In International Symposium on New Developments in Advanced High-Strength Sheet Steels. Association for Iron & Steel Technology, 2023. http://dx.doi.org/10.33313/298/007.

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Ding, W., Y. Gong, J. Y. Hong, X. J. Jin, X. F. Ding, and L. Wang. "The Influence of Vanadium on the Mechanical Properties of Ultra-high Strength Boron Steel Treated by Quenching and Partitioning Process." In 4th International Conference on Advanced High Strength Steel and Press Hardening (ICHSU2018). WORLD SCIENTIFIC, 2018. http://dx.doi.org/10.1142/9789813277984_0049.

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GRIFÉ, Laura. "Influence of pre-strain on fracture toughness of 3rd generation advanced high strength steels." In Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-134.

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Abstract. The present work investigates the influence of pre-strain on the fracture toughness of 3rd Generation Advanced High Strength Steels (AHSS). Specifically, a Carbide Free Bainitic (CFB) and a Quenching and Partitioning (Q&P) steel have been studied, the properties of which are crucial for lightweight vehicle construction. Fracture toughness, which is a key parameter for crash performance applications, is assessed using the Essential Work of Fracture methodology. The study investigates the pre-straining states of uniaxial tension, plane strain, and equibiaxial tension in 1.5 mm Q&P and 1.4 mm CFB sheet-form steels of 1180 MPa tensile strength. Overall, Q&P steel demonstrates superior fracture toughness compared to CFB steel. Remarkably, the specific essential work of fracture (we) remains unaffected by pre-straining across different strain states. Nevertheless, pre-straining exerts a notable influence on the non-essential plastic work (βwp) due to the plastic energy consumed during pre-deformation. These results suggest that pre-strain has little or no influence on the fracture properties of AHSS, which is relevant for the design and manufacturing of high crash-performance and safety-related components.
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de Oliveira, Pedro Gabriel Bonella, Ricardo Tadeu Junior Aureliano, Luiz Carlos Casteletti, André Itman Filho, Amadeu Lombardi Neto, and George Edward Totten. "Adhesive Wear Resistance of Low Temperature Austempered and Quenched and Partitioned Niobium Alloyed Steels." In HT2019. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.ht2019p0193.

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Abstract The quest for safety improvement with weight reduction of vehicles and consequently lower fuel consumption, led the automotive industry to begin research into the third generation of advanced high strength steels. These steels present complex microstructures, composed of martensite, bainite and stable retained austenite. Two of the main treatments for obtaining these microstructures are the low temperature austempering and Quenching and Partitioning (Q&P). The objective of this work is to evaluate the microhardness and adhesive wear performance of a high silicon steel alloyed with niobium submitted to the treatments mentioned above. The austempering treatment was conducted at 340 °C for 1 and 3 hours. Partitioning steps in Q&P were performed at 250 °C for 10, 30 and 60 minutes. Results shows that niobium addition promotes changes in the bainite morphology which improved the wear resistance.
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Sato, Kentaro, Tomohiro Sakaidani, Yuki Toji, et al. "Effect of Local Ductility of Advanced High Strength Steels in 980MPa and 1180MPa Grades on Crash Performance of Automotive Structures." In WCX SAE World Congress Experience. SAE International, 2023. http://dx.doi.org/10.4271/2023-01-0081.

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<div class="section abstract"><div class="htmlview paragraph">A fundamental study on the ductility of high strength steels under impact deformation is carried out to investigate the effect of the local ductility of various materials on crash performance. In this study, newly developed 980 and 1180 MPa grade steels are investigated to clarify their advantages in term of crash performance compared to conventional DP (Dual Phase) steels. The features of the developed steel, named as jetQ are higher yield strength and higher local ductility due to an optimized microstructure by the quenching and partitioning process (QP) [<span class="xref">1</span>, <span class="xref">2</span>]. The bending test according to VDA 238-100 is performed while observing the fracture propagation during the bending test. Fracture strain in the tensile tests is evaluated by a three-dimensional shape measurement technique for the fracture surface.</div><div class="htmlview paragraph">Both three-point bending tests and axial impact tests are performed to evaluate the crashworthiness of different types of steel. The three-point bending test simulates the “structural bending and intrusive deformation” that occur in the automotive side impact test. In the axial impact test, the “folding deformation” and energy absorption during the automotive front crash test are simulated in a laboratory testing machine. In this study, the fracture behavior and energy absorption performance of the high strength steels are investigated under both deformation modes.</div><div class="htmlview paragraph">Based on the experimental results, the effect of the local ductility of the high strength steel on the risk of material fracture is discussed. The experimental results show that high strength steels with higher ductility of thickness strain can improve crash deformation with lower risk of crash fracture. The jetQ steels of grades over 980 MPa have excellent local ductility compared to conventional DP sheets. The jetQ steel also shows higher crash performance due to its higher yield strength. Considering these advantages, the applicability of the jetQ steel to automobile body structures is discussed from the viewpoint of light weight body structures.</div></div>
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Reports on the topic "Advanced high strength steel; Quenching and partitioning"

1

Groeneveld. L51676 Evaluation of Modern X70 and X80 Line Pipe Steels. Pipeline Research Council International, Inc. (PRCI), 1992. http://dx.doi.org/10.55274/r0010158.

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Nine sections of advanced high strength line pipes, Grades X70 and X80 have been evaluated during this study. Six of those pipes were Grade X70 and three were Grade X80. Four of the X70 pipes were fabricated from microalloyed steels that were controlled rolled; the other two X70 pipes were controlled rolled plus accelerated cooled. Two of the controlled-rolled X70 pipes were produced from plates from the same slab of continuously cast steel; one was fabricated by the pyramid-rolling process and the other was fabricated by the U-O-E process. Two of the Grade X80 steels were produced from plate that was controlled rolled; one of those was accelerated cooled after controlled rolling. The third X80 pipe was produced from a microalloyed steel plate that was fabricated into pipe, ERW welded, and then heat treated by austenitizing, spray quenching, and tempering. The information obtained from the evaluations of these pipes is summarized in the following sections.
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