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Effect of microstructure on the fatigue crack growth behavior of laser solid formed 300M steel

机译：显微组织对激光固态成形300M钢疲劳裂纹扩展行为的影响

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摘要

In this research, the effect of microstructure on the fatigue crack growth rate (FCGR) of laser solid formed (LSFed) 300M steel was investigated. The results showed that the as-deposited microstructure of LSFed 300M steel consisted of martensite and coarse bainite. After heat treatment, the microstructure became homogeneous and was primarily composed of tempered martensite, bainite and a small amount of retained austenite. The FCGR of LSFed 300M steel gradually increases with increasing stress ratio (for a given stress intensity factor range and stress ratios between 0.1 and 0.5). The refined austenite grain of heat-treated LSFed 300M steel reduced the fatigue crack growth threshold (FCGT) and the FCGR. The fractography of as-deposited LSFed 300M steel was different from that of heat-treated LSFed 300M steel.
机译：在这项研究中，研究了微观结构对300M激光固态成形（LSFed）钢的疲劳裂纹扩展速率（FCGR）的影响。结果表明，LSFed 300M钢的初生组织由马氏体和粗贝氏体组成。热处理后，显微组织变得均匀，主要由回火马氏体，贝氏体和少量残余奥氏体组成。 LSFed 300M钢的FCGR随着应力比的增加而逐渐增加（对于给定的应力强度因子范围以及应力比在0.1和0.5之间）。经过热处理的LSFed 300M钢的精炼奥氏体晶粒降低了疲劳裂纹扩展阈值（FCGT）和FCGR。沉积后的LSFed 300M钢的形貌不同于热处理的LSFed 300M钢。

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  • 来源
    《Materials Science and Engineering》 |2017年第may17期|258-264|共7页
  • 作者

    Fenggang Liu; Xin Lin; Haiou Yang; Xiaoli Wen; Qiuge Li; Fencheng Liu; Weidong Huang;

  • 作者单位

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China ,Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MOT China, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China ,Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MOT China, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China ,Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MOT China, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China ,Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MOT China, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China ,Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MOT China, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China;

    National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, PR China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China ,Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MOT China, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China;

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

    Laser solid forming; Additive manufacturing; 300M steel; Microstructure; Stress ratio; Fatigue crack growth behavior;

    机译：激光固体成型;添加剂制造;300M钢;微观结构应力比疲劳裂纹扩展行为;

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