The effect of heat treatment temperature on welding joint cracking of steel 12Cr1MoV
DU Jinfeng
QIAO Zhan
LIU Fuguang
ZHANG Zhoubo
LIN He
CHENG Xiaole
Abstract：12Cr1MoV steel is widely used in superheater tubes of subcritical and thermal power units,and is often used as the material for main steam pipes.Fatigue cracking at the welded joints is the main cause of their failure.To address the issue of local cracking at the welds under service loads,three-point bending tests and ABAQUS simulations were conducted on samples heat treated at 730℃and 660℃respectively.The research results show that compared with heat treatment at 730℃,isothermal treatment at 660℃is more likely to enhance the brittleness of the weld microstructure,causing cracking to occur preferentially at the fusion line.The research results are greatly significance for optimizing the welding process of 12Cr1MoV steel and preventing failure risks.
Keywords：12Cr1MoV steelwelded jointsthree-point bending testcrackingweld-fusion line
Publication Date：2025-11-20
Online Publishing Date：2026-01-06(First online date of this platform, not the publication date of the document)
Pages：6( 63-68 )