Microstructure and Properties of Rotating Arc TIG Welded Joint of PCrNi3MoVA/40Cr Steel

doi:10.3901/JME.260564

Abstract

Abstract: In order to improve the service performance of PCrNi3MoVA/40Cr in real working conditions, the experiments used E307T0-1 stainless steel flux-cored wire to prepare PCrNi3MoVA/40Cr dissimilar steel rotary arc TIG welded joints. With the help of scanning electron microscope(SEM), X-ray diffractor(XRD), electron backscattering diffraction(EBSD) and other means of microstructure characterisation of PCrNi3MoVA/40Cr dissimilarity steel welded joints before and after heat treatment, and combined with the mechanical properties of dissimilarity steel joints and corrosion resistance test results, systematic study of the hardness of the welded joints, weld in the distribution of elements, the physical phase characteristics, Mechanical properties, corrosion resistance and other rules of change. The results show that: the weld surface integrity is good, no defects. After heat treatment, the grain size of the welded joint was reduced from 74.57 μm to 55.71 μm, and in the tensile and impact tests, the tensile strength was increased from 587.2 MPa to 829.6 MPa, and the specimens were all broken at the weld, and there was a toughness nest at the fracture, which is a typical toughness fracture. The improved tensile strength, impact toughness, and corrosion resistance of the heat-treated joints were attributed to the reduction of residual stresses, the increase of high-angle grain boundaries, and the reduction of dislocation density.

Key words: dissimilar steels, rotating arc, post-weld heat treatment, microstructure, mechanical properties, corrosion resistance

CLC Number:

TG457

YU Dongxin, ZHAO Yuncai, LIU Jian, DU Xian, XING Zhiguo, WANG Haidou. Microstructure and Properties of Rotating Arc TIG Welded Joint of PCrNi3MoVA/40Cr Steel[J]. Journal of Mechanical Engineering, 2026, 62(12): 241-252.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260564

http://www.cjmenet.com.cn/EN/Y2026/V62/I12/241

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