Effect of various factors on solid particle erosion behavior of degraded 9Cr-1MoVNb steel with experiment design

Abstract

The experimental design method was applied to study the effects of impact velocity, impact angle, and erodent particle amount on the solid particle erosion properties of 9Cr-1MoVNb degraded at high temperatures for a long time. The microstructural degradation and surface damage were analyzed by scanning electron microscope, energy spectrum, X-ray diffraction, and three-dimensional microscope. The largest effect on the erosion behavior was an impact velocity followed by impact angle, erodent particle amount, and microstructural degradation. Despite that the surface hardness of 9Cr-1MoVNb was reduced by up to 30% due to microstructural degradation, the effect on the erosion behavior was not significant. Finally, the regression model consisting of the functions of the factors and erosion mechanism were proposed.