Effects of cavitation jet peening treatment on the residual stress and fatigue properties of SAF2205 cruciform welded joints

Abstract

The cruciform welded joint is a weak position of filter press to cause fatigue failure under cyclic conditions. In this study, cavitation jet peening (CJP) treatment is proposed to improve the fatigue life of SAF2205 cruciform welded joints. The effects of different CJP treatment positions on the residual stress, microstructure, and microhardness were studied. The results show that different CJP treatment positions have different on residual stresses and fatigue life. The order of the residual stress in fracture position from large to small is the fully treated specimen, untreated specimen, one-sided treated specimen, and diagonal treated specimen, which is exactly opposite to the order of fatigue life from large to small. After the diagonal CJP treatment, the fatigue life is increased by up to 242.19%, and the residual stress at the weld toe is reduced by more than 80%. A strengthening layer with thicknesses of about 400 μm is formed.

Fatigue reliability assessment of load‐carrying cruciform welded joints with undercuts and misalignments

“…The variation may come from material properties, welding process, welding types, et al The compressive residual stress weakens the crack propagation rate, and some researchers study it as a parameter under some post-welding treatments. 55, 56 Bussu and Irving 57 concluded that higher FCG resistance of HAZ compared to other welding zones due to the compressive residual stress for the Al alloy welded specimens. In addition, the hardness distribution tends to exhibit a positive correlation with the rate of crack propagation.…”

Guest editorial of virtual special issue: Structural integrity in the context of carbon neutrality

“…To improve the fatigue life of welded joints, Zheng et al 12 proposed a cavitation jet peening (CJP) treatment and studied the effects of different treatment positions on residual stress, microstructure, and microhardness. It is shown that the residual stress of the diagonal treated specimen is the least and the fatigue life is the longest.…”