佟开开,韩国峰,许景伟,史程程,王文宇,朱胜,牛宗伟

• 1:山东理工大学机械工程学院
• 2:陆军装甲兵学院再制造技术国家重点实验室
• 3:中国人民解放军92853部队

摘要(Abstract)：

电弧增材制造(WAAM)在镍基高温合金零件的生产制造中具有自由度高、生产速度快和材料利用率高的优势，但由于增材成形过程中的高热输入容易造成合金的组织粗大和Laves相大量析出，大大降低了其力学性能。基于此，提出了一种在钨极气体保护焊的基值电流上施加超音频脉冲电流的方法来调控电弧热分布以及焊接熔池。采用光学显微镜、扫描电镜和电子万能试验机等对不同电流模式下增材制造的Inconel 718合金微观组织和力学性能进行了分析和研究。结果表明：超音频脉冲电流的加入使电弧热源更加集中，熔池的流动性增强，促进了强化元素中Nb和Mo等难溶元素在基体中的溶解扩散，从而抑制了Laves相的析出；施加超音频脉冲电流后Inconel 718合金的组织为较为细小的枝晶结构，Laves相的尺寸减小、分布的连续性降低；当施加的超音频脉冲电流大小为20 A,脉冲频率为50 kHz,占空比为20%时，合金的屈服强度为506 MPa、抗拉强度为821 MPa,伸长率降低至26.5%。

关键词(KeyWords)： Inconel 718合金;电弧增材制造;超音频脉冲电流;微观组织;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 佟开开,韩国峰,许景伟,史程程,王文宇,朱胜,牛宗伟

DOI: 10.13289/j.issn.1009-6264.2024-0314

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