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首页> 外文期刊>Materials Science and Engineering >Dependence of austenite stability and deformation behavior on tempering time in an ultrahigh strength medium Mn TRIP steel
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Dependence of austenite stability and deformation behavior on tempering time in an ultrahigh strength medium Mn TRIP steel

机译：奥氏体稳定性和变形行为对超高强度中等Mn TRIP钢回火时间的影响

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摘要

In the present study, the microstructure, tensile property and deformation behavior were investigated in Fe-8Mn-8Al-0.8C steel after quenching and tempering treatment (Q&T). The steel exhibited a ferrite-austenite-martensite mixed microstructure, and a good combination of ultrahigh ultimate tensile strength (UTS) of similar to 1500 MPa and total elongation (TE) of similar to 30%. The tensile property was improved after tempering at 200 degrees C, which is mainly due to an improvement of austenite stability. Tempering process promoted the uniform distribution of carbon element in austenite, resulting in an elimination of the serrated behavior in the strain hardening rate curve. The element partitioning from the supersaturated martensite and delta-ferrite to austenite during tempering, as well as its contributing effects to austenite stability, was also discussed. Two methods were used to quantitatively monitor austenite stability as a function of tempering time with regard to transformation-induced plasticity (TRIP) effect. After an optimal tempering treatment at 200 degrees C for 60 min, the continuous strain-induced martensite transformation resulting from an optimized austenite stability led to an ultrahigh tensile strength and a product of strength and elongation (PSE) of 41 GPa%. A fracture transition from brittle cleavage to ductile fracture was observed, which is due to variation of the local stress distribution between coarse delta-ferrite and adjacent austenite.
机译：在本研究中，研究了淬火和回火处理（Q＆T）后的Fe-8Mn-8Al-0.8C钢的组织，拉伸性能和变形行为。该钢具有铁素体-奥氏体-马氏体混合微观结构，并且具有类似于1500 MPa的超高极限抗拉强度（UTS）和相似于30％的总伸长率（TE）的良好组合。在200℃下回火后，拉伸性能提高，这主要是由于奥氏体稳定性的提高。回火过程促进了碳元素在奥氏体中的均匀分布，从而消除了应变硬化速率曲线中的锯齿状行为。还讨论了元素在回火过程中从过饱和马氏体和δ铁素体到奥氏体的分配及其对奥氏体稳定性的影响。关于相变诱导可塑性（TRIP）效应，使用两种方法来定量监测作为回火时间的函数的奥氏体稳定性。经过200℃的最佳回火处理60分钟后，由优化的奥氏体稳定性产生的连续应变诱发的马氏体相变导致了超高的拉伸强度以及41 GPa％的强度和伸长率（PSE）的乘积。观察到从脆性断裂到韧性断裂的断裂过渡，这是由于粗三角铁素体与相邻奥氏体之间局部应力分布的变化所致。

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  • 来源
    《Materials Science and Engineering》 |2018年第19期|153-162|共10页
  • 作者

    Zhou Naipeng; Song Renbo; Li Xuan; Li Jiajia;

  • 作者单位

    Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Xueyuan Rd 30, Beijing 100083, Peoples R China;

    Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Xueyuan Rd 30, Beijing 100083, Peoples R China;

    Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Xueyuan Rd 30, Beijing 100083, Peoples R China;

    Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Xueyuan Rd 30, Beijing 100083, Peoples R China;

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

    Tensile property; Deformation behavior; Austenite stability; Element partitioning;

    机译：拉伸性能;变形行为;奥氏体稳定性;元素划分;
  • 入库时间 2022-08-18 04:07:54

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