摘要
The microstructure of lneonel 601 nickel-based superalloy after gas tungsten arc welding and its transformation at different solution temperatures are studied. The results show that the original microstructure of weld seam is characterized coarsened austenitic granular crystal, there are a large amount of dispersed carbide and γ＇ phase with carbide as the core in the boundary of grains. Grain of heat-affected zone grows up severely with very little precipitated carbide. The carbide and γ＇ phase are gradually solved into the austenite matrix with the increase of solution treatment temperature. Especicdly solution treated at 1 150 ℃, the carbide and γ＇ phase are completely solved into the austenite matrix, the coarsened equiaxed anstenite grain sizes are refined.
The microstructure of lneonel 601 nickel-based superalloy after gas tungsten arc welding and its transformation at different solution temperatures are studied. The results show that the original microstructure of weld seam is characterized coarsened austenitic granular crystal, there are a large amount of dispersed carbide and γ＇ phase with carbide as the core in the boundary of grains. Grain of heat-affected zone grows up severely with very little precipitated carbide. The carbide and γ＇ phase are gradually solved into the austenite matrix with the increase of solution treatment temperature. Especicdly solution treated at 1 150 ℃, the carbide and γ＇ phase are completely solved into the austenite matrix, the coarsened equiaxed anstenite grain sizes are refined.
基金
The work was supported by the National High Technology Research and Development Program of China （ No. 2008AAO4Z136 ）, National Natural Science Foundation of China （50975197）, Tianjin Municipal Science and Technology Commission of China （09JCZDJC24000）.
