Effect of post-weld heat treatment on microstructure and properties of Ti-23Al-17Nb alloy laser beam welding joints
(Key Laboratory for Advanced Materials Processing Technology of the Ministry of Education,
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China)
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China)
Abstract: The mechanical properties of Ti-23Al-17Nb (mole fraction, %) laser beam welding alloy joint at room temperature are comparable to that of the base materials. However, the strength and ductility of the as-welded joint deteriorate seriously after high temperature circulation. The effect of post-welded heat treatment on the microstructure and mechanical properties of the joint was investigated. The heat treatment was taken at 980 ℃ for 1.5 h, then furnace cooling and air cooling were performed separately. The results indicate that proper post-welded heat treatment improves the ductility of the joint at high temperature.
Key words: Ti-23Al-17Nb; Ti3Al-based alloy; laser beam welding; post-weld heat treatment; mechanical properties