边培莹

• 1:西安文理学院西安市智能增材制造重点实验室

摘要(Abstract)：

对316L不锈钢粉末进行了激光选区熔化(Selective laser melting, SLM)成形,采用光学显微镜、扫描电镜和电子背散射衍射技术等研究了其热处理前后的残余应力及组织的变化。结果表明:热处理前试样的残余应力值从上表层向靠近基板的底层逐渐增大,残余应力较大;热处理后试样的残余应力降低,转变为较小压应力的稳定态;SLM直接成形试样的晶粒非常细小、晶粒尺寸为1～2μm,以月牙状铁素体组织为主,晶面位向差异与晶界间距大,相互之间形成了不平衡态的熔融热应力,导致产生了较大残余应力;固溶+时效热处理后,合金元素进行固溶重晶,晶粒长大,晶粒尺寸达到10～30μm,形成椭圆形的奥氏体组织,晶面位向差减小,为较均匀的各向同性配置,这种重晶促进了应力释放,残余应力明显降低或消除。

关键词(KeyWords)： 激光选区熔化(SLM);热处理工艺;微观组织;晶面位向差异

Abstract:

Keywords:

基金项目(Foundation): 陕西省教育厅重点科学研究计划(18JS097);; 陕西省表面工程与再制造重点实验室天元开放基金项目(tyw12019-07)

作者(Author): 边培莹

DOI: 10.13289/j.issn.1009-6264.2018-0332

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