Study on Softening Resistance of Overlay Welding Layer on Iron-based Multiple Alloying
The softening resistance of overlay welding layer on iron-based multiple alloying after heat treating at 200～600 ℃for various times was studied using microstructure observation and hardness testing.The results show that the overlay welding layer has good softening resistance and secondary hardening phenomenon,after heat treating at 500 ℃ for 2 h,its hardness has a high peak value 51.5 HRC,and after heat treating at 500 ℃ for 20 h,the hardness decreases slightly,which is close to that of as-welded samples.