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采用X射线衍射技术对2205双相不锈钢焊接界面残余应力进行测试,同时利用光学显微镜及电子背散射衍射技术(EBSD)对接头旋合区(RZ)、热机影响区(TMAZ)及热影响区(HAZ)微观组织进行分析。结果表明:接头轴向、径向残余应力均表现为压应力状态,呈单边V形分布,其中轴向残余应力峰值(-287 MPa)位于热机影响区(TMAZ)边缘,该区域α相和γ相在焊接过程中,在剪切及摩擦作用下,发生剧烈扭曲;而焊缝中心旋合区具有明显的动态再结晶特征,呈细小等轴晶状(3~4μm),残余应力仅为-15~-54 MPa。
The residual stress of 2205 duplex stainless steel welding interface was measured by X-ray diffraction (XRD), and the microstructure of the joint was analyzed by optical microscopy and electron backscatter diffraction (EBSD). The RZ, TMAZ and HAZ HAZ) microstructure analysis. The results show that the axial and radial residual stress of the joint are all compressive, with a unilateral V-shaped distribution. The peak axial residual stress (-287 MPa) is located at the edge of the TMAZ. The α and In the process of welding, γ phase is severely distorted under the effect of shear and friction. However, the spinodal zone has obvious dynamic recrystallization features with fine equiaxed crystal (3 ~ 4μm) and the residual stress is only -15 ~ -54 MPa.