Fatigue and creep damage behavior of aerospace-grade austenitic stainless steel GTAW joints:An X-ray diffraction residual stress analysis-based study
简介：With the continuous advancement of aerospace technology,ensuring the reliability of aerospace engines after testing is critical.While various methods exist for assessing fatigue life,non-destructive prediction based on in-situ X-ray diffraction(XRD)residual stress analysis remains underexplored—particularly for low-cycle fatigue in welded joints.This study proposes a novel approach that uses in-situ XRD to monitor residual stress evolution under fatigue and creep loading in gas tungsten arc welding(GTAW)joints of aerospace-grade austenitic stainless steel SUS321.Through metallographic observation,scanning electron microscopy(SEM),electron backscatter diffraction(EBSD),and in-situ XRD measurements,we demonstrate a strong correlation between longitudinal residual stress at the weld center and fatigue life.Under fatigue loading at 60%of the ultimate tensile strength(UTS),longitudinal residual stress transitions from tensile to compressive with increasing cycles,and fatigue fracture occurs once residual stress approaches base metal levels(∼0 MPa).In contrast,under creep loading,no clear trend in Y-direction residual stress was observed,limiting its utility for creep life prediction.This work establishes a reliable,non-destructive framework for evaluating the service life of welded aerospace components,offering a new methodology beyond conventional practices.展开
学者：JianLIDanqiZhangHaijingZhouChenShen
关键词：SUS321 stainless steelFatiguecreepresidual stressAerospace-grade metal
在线出版日期：2026-04-10 （网站首发日期）
