Tensile Property of ANSI 304 Stainless Steel Weldments Subjected to Cavitation Erosion Based on Treatment of Laser Shock Processing.

Lei Zhang,Xu-Dong Wu,Yue-Hua Liu,Chuang Zhou,Yong Zhao,Yong-Kang Zhang,Jian-Yun Huang,Kai-Yu Luo

doi:10.3390/ma11050805

Abstract

Tensile property was one important index of mechanical properties of ANSI 304 stainless steel laser weldments subjected to cavitation erosion (CE). Laser shock processing (LSP) was utilized to strengthen the CE resistance, and the tensile property and fracture morphology were analyzed through three replicated experiment times. Results showed tensile process of treated weldments was composed of elastic deformation, plastic deformation, and fracture. The elastic limit, elastic modulus, elongation, area reduction, and ultimate tensile strength of tensile sample after CE were higher in view of LSP. In the fracture surface, the fiber zone, radiation zone and shear lip zone were generated, and those were more obvious through LSP. The number and size of pores in the fracture surface were smaller, and the fracture surface was smoother and more uniform. The dimples were elongated along the unified direction due to effects of LSP, and the elongated direction was in agreement with the crack propagation direction. Their distribution and shape were uniform with deeper depth. It could be reflected that the tensile property was improved by LSP and the CE resistance was also enhanced.

Highlights

Cavitation erosion (CE) usually appears in a flowing system, as the local pressure falls below the vapor pressure of the liquid
The mass loss of S2 is thrice as much as that of S3, which indicates that the cavitation erosion (CE) resistance of the material is improved by laser shock processing (LSP) impacts [2,3]
Based on previous studies [2,3,4], the morphology of surface and cross section was changed during CE, and surface roughness was reduced, micro-hardness was increased, and residual stress was introduced; while the major index, tensile property, has not been involved

Summary

Introduction

Cavitation erosion (CE) usually appears in a flowing system, as the local pressure falls below the vapor pressure of the liquid. During this process, the oscillation behavior of cavitation bubbles is generated. The oscillation behavior of cavitation bubbles is generated These bubbles occur at the low pressure region and subsequently collapse when the pressure above the vapor pressure. ANSI 304 stainless steel (ANSI 304 SS) is widely used in parts of water pumps, valves, and blades, due to its characteristics and cheap cost. CE can deteriorate the ANSI 304 SS components, including the welding parts, which threatens the material performance [2,3,4]

Methods

Results

Conclusion