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首页> 外文期刊>Materials Science and Engineering >The study on martensite morphology in the stir zone and its influence to impact toughness during friction stir welding medium-Mn ultrahigh strength steel
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The study on martensite morphology in the stir zone and its influence to impact toughness during friction stir welding medium-Mn ultrahigh strength steel

机译：搅拌区马氏体形态的研究及其影响摩擦搅拌焊接介质 - Mn超高强度钢中的冲击韧性

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摘要

A 6 mm thickness medium-Mn ultrahigh strength steel was friction stir welded (FSW) with various rotation speed at constant of welding speed in this study. The microstructural evolution and impact toughness of the stir zone were investigated in a systematic manner. The microstructural observation results suggested that the metastable austenite in base metal disappeared after FSW, and the stir zone of FSW samples contained various morphology of martensite (i.e., well tempered martensite, less tempered martensite and common martensite). The content of well tempered martensite and less tempered martensite in the stir zone was decreased with the increase of rotation speed, and the martensite blocks and prior austenite grain size were gradually coarsened. It is suggested that the plastic deformation and the small prior austenite grain size promoted the formation of well tempered martensite in the stir zone at low rotation speed. The well tempered martensite could effectively release the stress concentration by interfaces separation with other martensite of different morphology during impact test, which greatly benefited the impact toughness. Furthermore, the small martensite blocks could also improve the impact toughness. The impact toughness of the stir zone was decided by the martensite blocks size and the content of different morphology of martensite phase.
机译：在本研究中，具有6毫米厚度的中Mn超高强度钢被摩擦搅拌焊接（FSW），各种转速，焊接速度恒定。以系统的方式研究搅拌区的微观结构演化和冲击韧性。微观结构观察结果表明，FSW后亚稳奥氏体在基础金属中消失，FSW样品的搅拌区含有各种Martensite的形态（即，良好的钢制马氏体，较少的锻炼马氏体和常见的马氏体）。随着旋转速度的增加，搅拌区中较良好的磨料马氏体和较小的回火马氏体的含量，并且马氏体块和先前奥氏体晶粒尺寸逐渐粗糙。建议塑性变形和小先奥氏体晶粒尺寸促进搅拌区中的良好升温马氏体的形成。良好的锻炼马氏体可以通过在冲击试验期间与不同形态的其他马氏体分离的界面有效地释放应力浓度，这极大地利用了冲击韧性。此外，小马氏体块也可以改善冲击韧性。搅拌区的冲击韧性由马氏体嵌段尺寸和马氏体相的不同形态的含量决定。

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  • 来源
    《Materials Science and Engineering》 |2020年第4期|140102.1-140102.12|共12页
  • 作者

    H.B. Cui; Y. Lu; G.M. Xie; Z.A. Luo; C.X. Wang; F.B. Kabwe; Z.G. Liu; X. Tang;

  • 作者单位

    Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education College of Materials Science & Engineering Guilin University of Technology No 12 Jiangan Road Guilin 541004 China State Key Laboratory of Rolling and Automation Northeastern University No.3 Wenhua Road Shenyang 110819 China;

    Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education College of Materials Science & Engineering Guilin University of Technology No 12 Jiangan Road Guilin 541004 China;

    State Key Laboratory of Rolling and Automation Northeastern University No.3 Wenhua Road Shenyang 110819 China;

    State Key Laboratory of Rolling and Automation Northeastern University No.3 Wenhua Road Shenyang 110819 China;

    Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education College of Materials Science & Engineering Guilin University of Technology No 12 Jiangan Road Guilin 541004 China;

    State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology College of Chemical Engineering Zhejiang University of Technology Hangzhou 310032 China;

    School of Material Science and Engineering Jiangsu University of Science and Technology Zhenjiang 212003 China;

    Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education College of Materials Science & Engineering Guilin University of Technology No 12 Jiangan Road Guilin 541004 China;

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  • 正文语种 eng
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  • 关键词

    Medium-Mn ultrahigh Strength steel; Friction stir welding; Well tempered martensite; Martensitic block; Impact toughness;

    机译：中型MN超高强度钢;摩擦搅拌焊接;锻炼马氏体良好;马氏体块;冲击韧性;

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