材料期刊网

HAZ CRACKING AND HOT DUCTILITY OF Ni_3AI CONTAINING Zr ALLOY

B. N. Qian , J. L. Li , J. T. Guo and B. Z. Wei (1)Institute of Metal Research , The Chinese Academy of Sciences , Shenyang 110015 , China 2)Shanghai University , Shanghai 200072 , China)

金属学报(英文版)

The HAZ cracking test in EB welding condition and hot ductility test show that the cracking mechanism is the formation of Ni - Ni5Zr eutectic which is resulting from the enrichment of Zr in grain boundaries during welding.In order to eliminate HAZ cracks the diffusion and recrystalization anealing treatment after cast and during cold rolling should be conducted in vacuum or protecting atmosphere and at the same time a slow welding speed is necessary.

关键词: Ni_3Al bearing Zr alloy , null , null