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中文摘要：
对某1 000 MW超超临界发电机组屏式过热器管屏进口段T23/12Cr1 MoV异种钢焊接接头的失效进行了试验分析.宏观与微观检查表明,裂纹沿管子焊缝周向分布,开裂起始于12Cr 1MoV管内壁粗晶粒热影响区,扩展至1/3厚度处进入焊缝,在焊缝中继续扩展至管子外壁.通过力学性能试验得出失效的主要原因是热影响区及焊缝的硬度高而塑韧性低,建议进行焊后热处理,以改善接头塑韧性和消除焊接残余应力.
英文摘要：
In this paper the experimental analysis is conducted regarding the failure of the T23/12Cr1MoV dissimilar steel welded joints on the specimen of the platen superheater in a 1 000-MW ultra supercritical （USC） boiler.Macroscopic and microscopic examinations indicate that the crack is distributed along the fusion line and occurs in the heat affected zone of the 12Cr1MoV steel.The crack initiates in the coarse grained heat affected zone （CGHAZ） of the tube inner wall,propagates into the weld metal at the 1/3 thickness of the wall,and terminates at the tube outer wall.Mechanical performance tests conclude that the higher hardness and lower ductility in the heat affected zone （HAZ） and weld metal are the major reasons for cracking.Post welding heat treatment（PWHT） is suggested to improve the ductility and reduce the welding residual stress for the welded joints.
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