薛行雁,程东海,张冠星,常云峰,刘付丽

• 1:郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室
• 2:南昌航空大学航空制造工程学院

摘要(Abstract)：

通过在TC4钛合金激光焊缝中添加Yb_2O_3,以提高接头超塑性变形均匀性，观察Yb_2O_3对焊缝超塑性变形前后组织的影响，并以等轴化系数表征组织在超塑变形中的演变进程。结果表明，Yb_2O_3的加入能够提高焊缝的超塑性能，从而提高接头的变形均匀性。加入Yb_2O_3后能够降低焊缝原始β晶粒尺寸，并推动焊缝针状组织的等轴化进程，促进超塑性变形。随着Yb_2O_3含量的升高，其作用效果呈现先增加后减小的趋势，当Yb_2O_3含量为6 mass%时效果最佳，焊缝伸长率达到最大54.8%,变形协调系数K最大为0.21;β晶粒尺寸最小为308μm,等轴化系数J达到最大0.26。

关键词(KeyWords)： 钛合金;Yb_2O_3;超塑性变形;变形协调系数K;等轴化系数J

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2022YFB3402204)

作者(Author): 薛行雁,程东海,张冠星,常云峰,刘付丽

DOI: 10.13289/j.issn.1009-6264.2023-0527

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