Improving Structure Integrity and Fatigue Properties of 316L Welded Joint by Water Jet Peening Treatment
Source abstract
Abstract
Applying surface treatment on welded joints is an important method for improving the surface integrity and service life of welded structures under a cyclic load condition. Water jet peening (WJP) is a new surface strengthening technology with environmental and economic benefits. In this paper, the effects of WJP treatment on the microstructure, microhardness, residual stress, and tensile and fatigue properties of 316L stainless steel welded joints were investigated, and the effect of WJP pressure was discussed. Results show that under a WJP pressure of below 200 MPa, the microstructure was refined and the residual stresses in the surface layer were reduced from tensile stress to compressive stress, thereby enhancing the fatigue strength and fatigue life of the welded structure. The strengthening effect of WJP treatment in the high cycle regime is greater than that in the low cycle regime. In addition, the microhardness, surface roughness, and mechanical strength all increased as a result of the WJP treatment. The treatment also inhibited the initiation of cracks and reduced the crack propagation rate. The microhardness, compressive residual stress, and tensile strength all increased along with WJP pressure. An appropriate WJP pressure should be set because a too high WJP pressure can reduce its strengthening effect on welded structures due to surface erosion and damage.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Surface Treatment and Residual Stress · Erosion and Abrasive Machining · Metal Alloys Wear and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (34)
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