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

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.

Resistance of PVD Coatings to Erosive and Wear Processes: A Review

“…The phenomenon of cavitation erosion consists in the degradation of the material surface as a result of multiple impacts of micro-jets formed during the implosions of cavitation bubbles. Cavitation erosion resistance of materials is tested using mainly ultrasonic devices compliant with the ASTM G-32 standard (Figure 1) [30,53,[65][66][67][68][69]. The ASTM G-32 standard allows performing tests in the direct and indirect methods (Figure 1).…”

“…Thus, the erosion process includes such damage processes as: dynamic fracture in micro-volumes, fatigue in micro-volumes, and corrosion. Hence, erosion resistant materials should be resistant to the mentioned damage processes [29,30]. Most of the investigations prove that deposition of PVD coatings improve fatigue resistance [31][32][33][34][35][36][37][38][39][40][41][42].…”

Experimental Study of the Influence of Deposition of Multilayer CrN/CrCN PVD Coating on Austenitic Steel on Resistance to Cavitation Erosion

“…Therefore, technologies which allow increasing hardness, especially hardness of the surface layer, are used to improve the resistance of the material to cavitation erosion. Such technologies include modification of the surface layer by laser processing [13,14] as well as production of hard coatings [15][16][17]. Among the various technologies for the production of hard coatings, the PVD (physical vapour deposition) method arouses particular interest because it allows the deposition of coatings with special properties.…”

Effect of Shear Strain Rate on Microstructure and Properties of Austenitic Steel Processed by Cyclic Forward/Reverse Torsion

“…Macroscopically, the cross-sectional shrinkage of the L100 sample is significantly higher than that of the H100 sample, indicating that the L100 sample has better ductility. Generally, on the micro level, the fracture surfaces of ductile materials exhibit dimples generated by dislocation activities at the final fracture stage [39,40], while the brittle fracture surface often has cleavage planes [41], quasi-cleavage planes, or even rock-candy patterns [42]. Both the low-speed and high-speed twisted samples show dimples in the core.…”