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首页> 外文期刊>Materials Science and Engineering >Improved impact toughness by multi-step heat treatment in a 1400 MPa low carbon precipitation-strengthened steel
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Improved impact toughness by multi-step heat treatment in a 1400 MPa low carbon precipitation-strengthened steel

机译：通过在1400MPa低碳沉淀 - 强化钢中通过多步热处理改善冲击韧性

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摘要

Multi-step heat treatment including intercritical treatment plus traditional tempering is proposed to tailor strength and toughness in a low carbon precipitation-strengthened steel. Microstructure and mechanical properties has been systemically studied. Result shows that multi-step heat treatment is effective to improve the toughness (from ～8 J to ～38 J) with limited sacrifice of yield strength (from -1429 MPa to -1311 MPa). Nano-sized retained austenite was obtained located at boundaries, and its volume fraction is -6.1 pct. after multi-step heat treatment, which is thought to be responsible to the improvement of toughness. Meanwhile, high angle boundary (>15 deg.) length increases from 0.7959 μm to 0.9157 μm per square micron. Increased boundary length results in equivalent grain size decreases from ～1.11 μm to -0.61 um. The decreased equivalent grain size is beneficial to the increment of strength and toughness. Moreover, reduced Cu segregation is also responsible to the increment of toughness, and slightly decrease in strength could come from decreased dislocation density, coarsening precipitates and reduced solute content in tempered martensite.
机译：包括跨临界处理加上传统回火的多步热处理，以在低碳沉淀加强钢中量裁强度和韧性。微观结构和机械性能已经全系统研究。结果表明，多步热处理是有效改善韧性（从〜8J至〜38J），屈服强度有限的牺牲（从-1429MPa至-1311MPa）。在边界处获得纳米大小的奥氏体，其体积分数为-6.1pct。经过多步热处理后，被认为是对韧性的提高负责。同时，高角度边界（> 15°）长度从0.7959μm增加到每平方微米0.9157μm。增加的边界长度导致等效的晶粒尺寸从〜1.11μm降低至-0.61μm。减少的等效晶粒尺寸有利于强度和韧性的增量。此外，还原的Cu偏析也负责韧性的增量，并且强度略微降低可能来自降低的位错密度，粗化沉淀物和钢制马氏体中的溶质含量降低。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140077.1-140077.11|共11页
  • 作者

    Wei Hou; Qingdong Liu; Jianfeng Gu;

  • 作者单位

    Institute of Materials Modification and Modelling School of Materials Science and Engineering Shanghai Jiao Tong University 200240 Shanghai PR China;

    Institute of Materials Modification and Modelling School of Materials Science and Engineering Shanghai Jiao Tong University 200240 Shanghai PR China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong University 200240 Shanghai PR China;

    Institute of Materials Modification and Modelling School of Materials Science and Engineering Shanghai Jiao Tong University 200240 Shanghai PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    High strength steel; Impact toughness; Retained austenite; Intercritical heat treatment; Reverse transformation; Grain refine;

    机译：高强度钢;冲击韧性;保留奥氏体;跨临界热处理;逆转变换;谷物精炼;

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