焊后热处理对Alloy33堆焊层耐蚀性的影响OA北大核心CSTPCD

To investigate the effect of post-weld heat treatment(PWHT)on the corrosion resistance of the Alloy33 overlay,automatic tungsten inert gas welding(TIG)was used to weld the corrosion-resistant layer of Alloy33 onto a 2.25Cr-1Mo base material.The microstructure and mechanical properties of the weld layer were analyzed,revealing that the microstructure of the corrosion-resistant layer in the as-welded state is austenite with a small amount of carbides,while the heat-treated state contains more carbides.The corrosion performance of the corrosion-resistant layer was evaluated using four corrosion standards:ASTM G28-2024 A,ASTM A262-2015 C,ASTM A262-2015 E and GB/T 15260-2016 C.The results indicate that Alloy33 exhibits excellent corrosion resistance in weakly oxidizing media under both as-welded and heat-treated conditions.However,when used in containers with strong oxidizing media,the heat treatment state of the Alloy33 corrosion-resistant layer should be carefully selected according to specific operating conditions.For containers in strongly reducing media,Alloy33 should be avoided.This study provides strong references for improving the design of Alloy33 welding processes and mitigating intergranular corrosion on the inner walls of containers.