Abstract

Abstract

In power generation industry, inlet fog cooling is used for the turbine inlet cooling (TIC). However, this approach also leads to liquid impingement erosion (LIE) of the rotating blades in the compressor, resulting in performance degradation and reduction of service life of gas turbines.
Previous studies have introduced Laser shock peening (LSP) and shot peening (SP) as potential solutions for LIE of Ti64. However, no study has been done on the LIE performance of the low plasticity burnished Ti64.
Full factorial design of experiments was conducted to investigate the effects of LPB process parameters (Feed Rate, Spindle Velocity, Number of Passes, Pressure) on the residual stress distribution, microhardness and surface roughness of Ti64. The surface microhardness and the surface roughness of the Ti64 were improved after the LPB treatment. Moreover, a large magnitude of compressive residual stress layer was induced by LPB treatment on the surface of the Ti64. However, the results of the LIE tests showed that LPB treatment has little or no effect on the LIE performance of Ti64.