摘要
通过单向拉伸试验、自由胀形试验和硬度试验,研究了Ti-6Al-4V等离子弧焊焊缝的室温和高温力学性能。结果表明,在室温下,焊接接头的强度降低,塑性下降;同时焊缝区硬度提高,热影响区的硬度下降。在Ti-6Al-4V超塑成形温度925℃,单向热拉伸试验表明,焊缝的屈服强度相当于基体的一倍半,而断后伸长率为59%,不具有超塑性能。自由胀形试验表明,等离子弧焊对接板的极限胀形高度可超过所用凹模的半径。
The mechanical properties at room and elevated temperature were studied for butt joint of Ti-6Al-4V titanium alloy welded metal by plasma arc welding(PAW).Compared to the base metal,the strength and hardness,and ductility of the fusion zone decreased,and the strength and hardness of the heat affected zone decreased.Whereas the hot tensile test indicated that the weld metal of PAW doesn't possesses superplasticity and the hot biaxial tensile test demonstrated that the same weld metal possesses good superplastic bulging ability.
出处
《焊接》
北大核心
2009年第1期41-45,共5页
Welding & Joining
