Characterization of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Titanium Alloy by Laser Shock Peening

Abstract

In this paper, the microstructure and microhardness of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy with and without laser shock peening (LSP) were examined and compared. The titanium alloy samples were treated with different layers, at the same power density. X-ray diffraction (XRD), Transmission Electron Microscope (TEM) and microhardness techniques were used to analyse microstructure and mechanical. X-ray diffraction analysis shows that there was not any phase transformation and no new crystalline phases have been formed. TEM studies demonstrate that both α and β phase can been refined in the surface layer with LSP. The microhardness measurements with LSP demonstrate that Hardness of crystallization surface is high up to 418MPa, which is more than the sample without LSP, the shock wave improved the microhardness for about 8%, and the affected depth is about 400 microns from the surface.

Effect of Residual Stress and Microstructures on 316 Stainless Steel Treated by LSP

“…The strain rate caused by LSP is very high, and can make residual compressive stress and a series of changes, such as grain refinement. The use of shock waves is very effective to improve the mechanical properties of metallic materials, such as fatigue, corrosion and wear resistance [6][7][8][9][10][11]. Kumagai et al discussed the microstructures of AISI316 stainless steel treated by shoting/laser-peening [12].…”