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Cr-alloyed novel press-hardening steel with superior combination of strength and ductility

机译：CR合金新型压力硬化钢，具有优异的强度和延展性的组合

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摘要

A novel press-hardening steel (PHS) with an ultra-high tensile strength of 1680 MPa and an excellent total elongation of 9.2% has been developed and produced at an industrial scale. In addition to high strength, the new PHS showed significantly improved ductility as compared to the baseline PHS grade 22MnB5 (～7.0%) mainly because of its nano-sized retained austenite (RA), which was formed as a result of dynamic carbon partitioning after the martensitic transformation during the hot forming process. Dynamic carbon partitioning from the martensite to austenite during cooling and RA stabilization was achieved by adding optimum amounts of Si and Cr to the novel PHS without alternating the industrial hot forming process. To investigate the effect of the RA on the mechanical performance of the new PHS, microstructure without RA was prepared for comparison by direct water quenching after the austenitization to suppress the carbon migration. Detailed characterization revealed that the RA was beneficial for improving both the uniform and post-uniform elongation of the novel PHS. The effects of Si and Cr on the formation of the RA were investigated with the aid of thermo-kinetic calculations. The excellent combination of strength and ductility of the novel PHS will enable a significant weight reduction when it replaces the current PHS grade 22MnB5 for a variety of vehicle body structure components.
机译：具有1680MPa的超高拉伸强度的新型压力硬化钢（PHS）和优异的总伸长率为9.2％，并以工业规模生产。除了高强度之外，与基线pHS级22MnB5（〜7.0％）相比，新的pHS显示出显着提高的延展性，主要是因为其纳米大小的保留奥氏体（RA），其是由于动态碳分配而形成的热成型过程中的马氏体转化。通过将最佳量的Si和Cr添加到新型pHs而不交替工业热成型过程，通过在新型pH中添加最佳的Si和Cr，从冷却过程中从马氏体到奥氏体到奥氏体的动态碳划分。为了探讨RA对新pHS的机械性能的影响，制备无RA的微观结构，以便通过奥氏体化后的直接水猝灭来抑制碳迁移。详细表征揭示了RA有益于改善新型pHs的均匀和后均匀伸长率。借助热动力学计算研究了Si和Cr对Ra形成的影响。当新的PHS的强度和延展性的优异组合将使当它取代各种车身结构部件的当前PHS级22MnB5时，可以显着减少。

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  • 来源
    《Materials Science and Engineering》 |2021年第5期|141461.1-141461.9|共9页
  • 作者

    Xiaolu Wei; Zhisong Chai; Qi Lu; Jun Hu; Zhongyi Liu; Qingquan Lai; Jianfeng Wang; Wei Xu;

  • 作者单位

    The State Key Laboratory of Rolling and Automation Northeastern University Shenyang China;

    The State Key Laboratory of Rolling and Automation Northeastern University Shenyang China;

    The State Key Laboratory of Rolling and Automation Northeastern University Shenyang China China Science Lab General Motors Global Research & Development Shanghai China;

    The State Key Laboratory of Rolling and Automation Northeastern University Shenyang China;

    Chemical and Materials System Lab General Motors Global Research & Development Warren USA;

    Herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology Nanjing China;

    China Science Lab General Motors Global Research & Development Shanghai China;

    The State Key Laboratory of Rolling and Automation Northeastern University Shenyang China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Press-hardening steel; Mechanical property; Retained austenite; Ductility;

    机译：压紧钢;机械性质;保留奥氏体;延展性;

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