High temperature wear performance of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy subjected to laser shock peening

Abstract

This paper investigates the influence of laser shock peening (LSP) parameters on surface integrities and high temperature wear performances of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy. Surface integrities include surface roughness, residual stress and micro-hardness are measured. High temperature wear performance of TC11 alloy with and without LSP are investigated. The results indicate that multiple LSP impacts can improve surface micro-hardness and induce compressive residual stress in the surface layer. Moreover, the friction coefficient and wear rate of TC11 alloy significantly decrease after LSP with optimised parameters. The improved wear performance is ascribed to the low surface roughness, higher surface micro-hardness and compressive residual stress induced by multiple LSP impacts in the surface layer.

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Superalloy GH4169 Subjected to Warm Laser Shock Peening

“…The vacancy–Nb pair diffused towards the defect and reduced the system energy, resulting in the Nb nonequilibrium. Because the driving force of this concentration gradient would lead to the movement of the γ”/δ interface, heat treatment at a lower temperature would promote the expansion and spheroidization of the decomposed α phase [ 18 , 19 ].…”

“…The dislocations in the elongated grains were clustered near the phases. The small-angle grain boundaries in the elongated grains formed new large-angle grain boundaries through migration and rotation, and the original elongated grains were divided into several smaller equiaxed grains [ 14 , 16 , 17 , 18 ]. Thus, the finely dispersed and dispersed γ″ phase was interspersed with a large number of dislocations in the δ phase, forming a structure similar to reinforced concrete.…”

“…The laser shock temperature was decided based on the formula of “qian–xiaoli model” proposed by Qian [ 18 ]. According to his theory, the temperature range of the dynamic strain aging of alloy is approximately 0.2–0.5 Tm (Tm is the melting point temperature of an alloy).…”

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Super-Alloy GH4169 Subjected to Warm Laser Shock Peening

“…Therefore, WLSP is a preferred technology to improve properties of GH4169. To our knowledge, few efforts were put on investigations on improving the surface structure stability and high temperature service performance of GH4169 superalloy by WLSP technique [15][16][17].…”