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首页> 外文期刊>Materials Science and Engineering >Improved strength-ductility-toughness balance of a precipitation-strengthened low-carbon medium-Mn steel by adopting intercritical annealing-tempering process
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Improved strength-ductility-toughness balance of a precipitation-strengthened low-carbon medium-Mn steel by adopting intercritical annealing-tempering process

机译：通过采用跨临界退火过程改善沉淀加强的低碳介质 - Mn钢的强度 - 延展性 - 韧性平衡

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摘要

The present study on low-carbon medium-Mn steel demonstrates that the newly proposed "intercritical annealing-tempering" process led to good combination of strength, ductility and impact toughness, by simultaneously optimizing austenite reverted transformation and Cu precipitation. Intercritical annealing at high temperature accelerated the dissolution of cementite particles, promoted the formation of reverted austenite, and then increased the total elongation and impact energy. The additional tempering at 500 °C facilitated intensive precipitation of Cu-rich precipitates in secondary martensite. The precipitates were fine, uniform in size and high in density, which provided a significant strengthening effect. Strengthening by nano-scale Cu-rich precipitates compensated softening associated with high temperature annealing, and increased the yield strength of tempered medium-Mn steel by 75 MPa. In addition to facilitating Cu precipitation, the introduction of secondary martensite also promoted nucleation of reverted austenite during tempering with sufficient C and Mn concentration that stabilized austenite and further improved ductility. Excellent mechanical properties, 960 MPa yield strength, 1010 MPa tensile strength, 29.2% total elongation and 150 J impact energy at room temperature were obtained in the precipitation-strengthened low-carbon medium-Mn steel, on intercritical annealing at 645 °C, followed by tempering at 500 °C for 2 h.
机译：通过同时优化奥氏体再转化的转化和Cu沉淀，对新提出的“跨临界退火”过程导致了强度，延展性和冲击韧性的良好组合。高温下的跨临界退火加速渗碳岩颗粒的溶解，促进了再介质奥氏体的形成，然后增加了总伸长率和冲击能量。在二次马氏体中额外的500°C的额外回火促进了Cu的富含沉淀物的密集沉淀。沉淀物的尺寸细，均匀，密度高，提供了显着的强化效果。通过纳米尺寸富含量的富沉淀物加强与高温退火相关的补偿软化，并通过75MPa提高回火介质-MN钢的屈服强度。除了促进Cu沉淀之外，次级马氏体的引入还促进了在以足够的C和Mn浓度的回火过程中促进了恢复奥氏体的成核，其稳定的奥氏体和进一步改善的延展性。优异的机械性能，960MPa屈服强度，1010MPa拉伸强度，在沉淀加强的低碳介质-MN钢中获得29.2％的总伸长率和150架冲击能量，在645°C下进行临临时退火通过在500℃下回火2小时。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140636.1-140636.16|共16页
  • 作者

    Y. Zou; Y.B. Xu; G. Wang; Y. Han; H.X. Teng; D.T. Han; M.S. Qiu; F. Yang; R.D. K. Misra;

  • 作者单位

    Shougang Research Institute of Technology Yangzhuang Street 69 Beijing 100043 China State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China;

    State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China;

    Dongfeng Peugeot Citroen Automobile Co. Ltd Shenlong Street 165 Wuhan 430056 China;

    Shougang Research Institute of Technology Yangzhuang Street 69 Beijing 100043 China;

    Shougang Research Institute of Technology Yangzhuang Street 69 Beijing 100043 China;

    State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China;

    Shougang Research Institute of Technology Yangzhuang Street 69 Beijing 100043 China;

    Shougang Research Institute of Technology Yangzhuang Street 69 Beijing 100043 China;

    Laboratory for Excellence in Advanced Steel Research Department of Metallurgical Materials and Biomedical Engineering University of Texas at El Paso TX 79968 USA;

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  • 正文语种 eng
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  • 关键词

    Medium-Mn steel; Austenite reverted transformation; Cu precipitation; Strengthening and toughening; Microstnicture-properues;

    机译：中型钢;奥氏体恢复转化;Cu降水;加强和增韧;微观结构性质;

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