陈伟,侯娟,黄爱军

• 1:上海理工大学材料科学与工程学院

摘要(Abstract)：

采用光学显微镜(OM), X射线衍射仪(XRD),扫描电镜(SEM),透射电镜(TEM)等研究了热处理工艺对选区激光熔化(SLM)制备的304L不锈钢微观组织结构与力学性能的影响。结果表明:SLM制备的304L不锈钢的组织结构细小,组织中存在高密度位错、δ铁素体与σ相析出物,其强度和塑性均远高于传统304L不锈钢。对SLM制备的304L不锈钢分别进行1050℃×30 min和1000℃×2 h固溶处理后,其微观组织结构发生了变化,观察到了晶内胞状亚晶组织的长大和析出相的固溶,强度和塑性均有所降低。SLM制备过程产生的大量纳米级胞状亚晶结构,是304L不锈钢具有高强高韧性能的主要原因,析出强化和加工硬化可进一步提高其强度。

关键词(KeyWords)： 选区激光熔化;304L不锈钢;热处理;组织结构;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 陈伟,侯娟,黄爱军

DOI: 10.13289/j.issn.1009-6264.2019-0392

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