Effect of laser incident angle on microstructure and mechanical properties of Ir-Rh alloy and Ni-based alloy by laser welding
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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。Abstract: 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.
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Keywords:
- laser welding /
- spark plug /
- microstructure evolution /
- thermal fatigue /
- mechanical properties
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