曾强,吴颖,夏林,朱绍维

• 1:四川文理学院智能制造学院
• 2:成都飞机工业(集团)有限责任公司

摘要(Abstract)：

后热处理可以有效改善选区激光熔化(SLM)制造的Inconel 718合金的强塑性匹配，但其氢脆断裂行为目前还尚不明确。为此，对SLM制造的Inconel 718合金进行了高温固溶+单级时效热处理，并采用扫描电镜的电子背散射衍射(EBSD)和背散射电子(BSE)成像对其显微组织进行了分析，通过预充氢前后的拉伸实验对合金的氢脆敏感性进行了评估，并采用EBSD和BSE对拉伸试样的断口表面形貌和裂纹扩展路径进行了分析。结果表明：热处理后，SLM制造的Inconel 718合金的抗拉强度可达1341 MPa,并保持24.5%的断后伸长率，但也具有较高的氢脆敏感性，充氢96 h后合金的强度损伤和塑性损失分别达到18.5%和52.3%。拉伸过程中晶界上由于δ相以及滑移带引起的应力集中促进了晶界上氢的局部富集，从而诱发沿晶氢脆裂纹的萌生及扩展。

关键词(KeyWords)： Inconel 718合金;选区激光熔化;氢脆;裂纹扩展路径

Abstract:

Keywords:

基金项目(Foundation): 达州市智能制造产业技术研究院2022年度开放基金项目(ZNZZ2214)

作者(Author): 曾强,吴颖,夏林,朱绍维

DOI: 10.13289/j.issn.1009-6264.2023-0596

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