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首页> 外文期刊>Materials Science and Engineering >Fatigue and fracture behaviour of laser powder bed fusion stainless steel 316L: Influence of processing parameters
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Fatigue and fracture behaviour of laser powder bed fusion stainless steel 316L: Influence of processing parameters

机译：316L激光粉末床熔合不锈钢的疲劳和断裂行为：加工参数的影响

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摘要

The laser powder bed fusion (L-PBF) process involves a large number of processing parameters. Extending the intricate relationship between processing and structure to mechanical performance is essential for structural L-PBF materials. The high cycle fatigue properties of L-PBF parts are very sensitive to process-induced porosities which promote premature failure through the crack initiation mechanisms. Results from this work show that for stainless steel 316 L, porosity does not impinge on the high cycle fatigue properties when processing is kept within a ± 30% tolerance band. In this 'optimum' processing region, crack initiation takes place due to defects at the solidification microstructure level. Beyond the 'optimum' processing region, over-melting and under-melting can lead to porosity-driven cracking and inferior fatigue resistance. In addition, regardless of the processing condition, fatigue resistance was found to follow a direct linear relationship with ductility and tensile strength in the low and high stress fatigue regimes respectively.
机译：激光粉末床熔合（L-PBF）工艺涉及大量加工参数。将加工和结构之间的复杂关系扩展到机械性能对于结构L-PBF材料至关重要。 L-PBF零件的高循环疲劳特性对加工引起的孔隙非常敏感，这些孔隙通过裂纹引发机制促进过早失效。这项工作的结果表明，对于316 L不锈钢，当加工保持在±30％的公差范围内时，孔隙率不会影响高循环疲劳性能。在此“最佳”加工区域中，由于凝固微观结构级别的缺陷而发生了裂纹萌生。在“最佳”加工区域之外，过度熔融和熔融不足会导致孔隙驱动的裂纹和较差的耐疲劳性。另外，无论加工条件如何，在低应力和高应力疲劳状态下，其抗疲劳性均与延性和拉伸强度呈直接线性关系。

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  • 来源
    《Materials Science and Engineering》 |2017年第4期|251-261|共11页
  • 作者

    Meng Zhang; Chen-Nan Sun; Xiang Zhang; Phoi Chin Goh; Jun Wei; David Hardacre; Hua Li;

  • 作者单位

    Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798,Singapore,Lloyd's Register Global Technology Centre, I Fusionopolis Place, #09-11 Galaxis, Singapore 13852, Singapore;

    Singapore Institute of Manufacturing Technology, 73 Nanyang Drive, Singapore 637662, Singapore;

    Faculty of Engineering & Computing, Coventry University, Coventry CV1 5FB, UK;

    Lloyd's Register Global Technology Centre, I Fusionopolis Place, #09-11 Galaxis, Singapore 13852, Singapore;

    Singapore Institute of Manufacturing Technology, 73 Nanyang Drive, Singapore 637662, Singapore;

    Faculty of Engineering & Computing, Coventry University, Coventry CV1 5FB, UK;

    Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798,Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Selective laser melting; Laser powder bed fusion; Stainless steel 316L; Porosity; Fatigue property; Process window;

    机译：选择性激光熔化;激光粉末床熔合;316L不锈钢;孔隙率疲劳特性;处理窗口;

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