摘要
研究了激光入射角度对Ir-Rh与Ni基合金的异材焊接的影响。采用光学显微镜、扫描电镜、能谱分析等手段对焊缝的微观组织、结合机制和热疲劳性能进行了分析。焊缝主要由Ir-Ni固溶体组成。热冲击试验结果表明,热疲劳抗力受热应力和高温氧化的影响。当激光入射角度为10°时,焊接接头的最大折断力为163.3 N,同时获得了最好的热疲劳抗性;但断裂位置受激光入射角度变影响较小,均发生在Ir-Rh合金与焊缝的结合面,断裂形式以沿晶断裂为主。
Effect of laser incident angle on welding of Ir-Rh and Ni-based alloy was studied. Optical microscopy, scanning electron microscopy, and energy-dispersive spectroscopy were conducted to analyze microstructure, bonding mechanism of the weld as well as thermal fatigue. The weld mainly consisted of the Ir-Ni solid solution. Thermal fatigue experiment results indicated that the thermal fatigue resistance was affected by thermal stress and high-temperature oxidation. When the laser incidence angle was 10°, the break force of welded joint reached the maximum 163. 3 N, and the best thermal fatigue resistance was obtained. However, the fracture position was less affected by the laser incident angle, and all fracture occurred on the interface between the Ir-Rh alloy and the weld, and the fracture form was mainly intergranular fracture.
作者
杨辉睦
赵仕方
胡国义
邓钧
杜德魁
陶伟
Yang Huimu;Zhao Shifang;Hu Guoyi;Deng Jun;Du Dekui;Tao Wei(Weichai Torch Technology Co.,Ltd.,Zhuzhou 412001,Hunan,China;Central South University,Changsha 410083,China)
出处
《焊接》
北大核心
2021年第9期28-33,38,62,63,共9页
Welding & Joining
基金
湖南省创新平台与人才计划(2016TP2022)。
关键词
激光焊接
火花塞
组织演变
热疲劳
力学性能
laser welding
spark plug
microstructure evolution
thermal fatigue
mechanical properties
