摘要
研究了焊后真空热处理对BT2 0钛合金CO2 激光和YAG激光焊接接头性能的影响。研究结果表明 :真空热处理前 ,BT2 0钛合金激光焊接接头的抗拉强度和延伸率基本与母材相当 ,而接头各区域的显微硬度高于母材。焊后真空热处理能显著降低激光焊接接头中的残余应力并改善其分布状态 ,同时对焊接接头的性能影响不大。焊后真空热处理对YAG激光焊接接头性能的影响较CO2 激光焊接接头敏感 。
In this paper, the effects of postweld heat treatment in vacuum on properties of laser welded joint of BT20 titanium alloy were studied. It showed that the tensile strength and the elongation of CO 2 laser and YAG laser welded joint of BT20 titanium alloy without heat treatment were equivalent to those of the base metal respectively, but the microhardness was higher than that of the base metal. Postweld heat treatment in vacuum could obviously decrease the residual stress and improve the distribution of the residual stress of laser welded joint, and the effects on properties of welded joint were not obvious. In addition, the effects of postweld heat treatment on properties of YAG laser welded joint were more sensitive than that of CO 2 laser welded joint because of greater effect on acicular martensite α′ in YAG laser weld.
出处
《焊接》
2003年第6期21-24,共4页
Welding & Joining
