吴昌毅,舒登威,商文学,郭乾应

• 1:海装沈阳局
• 2:天津大学材料科学与工程学院
• 3:中国航发沈阳黎明航空发动机有限责任公司

摘要(Abstract)：

首先采用激光选区熔化(SLM)技术制备了GH4099合金，并对其进行了不同工艺的激光焊接及焊后时效处理，研究了焊接热输入与焊后时效处理对接头微观组织和力学性能的影响，分析了接头焊缝和热影响区中的强化相析出行为与硬度的变化规律。结果表明：采用激光焊接SLM GH4099合金可得到成型良好，无可视宏观缺陷，仅存在极少量微观缺陷的焊接接头；焊接接头中γ′相的平均尺寸随焊后时效处理的进行而逐渐增大，导致显微硬度增加，时效2 h后γ′相粗化速度和显微硬度提升程度放缓，时效10 h后，焊缝中的γ′相尺寸从0～10 nm增大到20～30 nm,热影响区中的γ′相呈现双峰分布特征，由小尺寸γ′相为主导转变为大尺寸γ′相为主导，同时焊缝和热影响区显微硬度均从时效前的约200 HV提升至约400 HV;焊接热输入会影响焊接接头在后续时效过程中的γ′相析出行为及力学性能，时效过程中低热输入样品的接头具有更快的γ′相长大速率；时效2和10 h后，低热输入样品的接头焊缝/热影响区均具有更大的γ′相尺寸，并且显微硬度均高于高热输入的接头。

关键词(KeyWords)： GH4099高温合金;激光焊接;γ′相;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家高层次青年人才项目

作者(Author): 吴昌毅,舒登威,商文学,郭乾应

DOI: 10.13289/j.issn.1009-6264.2025-0389

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