唱丽丽,汪涛,申赛刚,马岳,邢月华

• 1:南京航空航天大学材料科学与工程学院
• 2:南京中科煜宸激光技术有限公司
• 3:江苏大学材料科学与工程学院

摘要(Abstract)：

采用光学显微镜、扫描电镜、显微硬度计和力学性能试验等研究了选区激光熔化(SLM)In718合金的激光焊接接头的组织和性能。结果表明:SLM In718合金的激光焊接接头的宏观质量较好,没有发现冶金缺陷的存在。未热处理时,In718合金的SLM构件的组织主要由奥氏体柱状晶及奥氏体柱状晶之间的共晶组织构成,柱状晶的平均尺寸约为5μm×2μm;激光焊接SLM构件的焊缝组织主要由奥氏体柱状晶及奥氏体柱状晶之间的共晶组织构成,柱状晶的平均尺寸约为25μm×5μm;焊缝区显微硬度均值约282 HV,是SLM母材均值335 HV的84.2%;不同厚度焊接试样的抗拉强度为970～983 MPa(均达到SLM母材95%以上),伸长率为20.2%～22.6%(为SLM母材65%以上);固溶+时效处理后,焊接试样抗拉强度均值为1412 MPa(约为SLM母材的98.9%),伸长率均值为13.5%(约为SLM母材的93.7%),与未热处理相比,SLM母材和焊缝显微硬度值分别提高了55.2%和77.3%。

关键词(KeyWords)： In718镍基合金;激光焊接;选区激光熔化;性能

Abstract:

Keywords:

基金项目(Foundation): 南京市优势产业关键技术突破招标项目(2018003)

作者(Author): 唱丽丽,汪涛,申赛刚,马岳,邢月华

DOI: 10.13289/j.issn.1009-6264.2019-0425

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