Important features of elevated temperature erosive wear

4 Important features of elevated temperature erosive wear 

Over the last few decades or so, a substantial amount of work on elevated temperature erosion of metals and alloys has been carried out. This work is reviewed, providing details of materials subjected to elevated temperature erosion and the test conditions, in ref. [36]. The tests were conducted over a wide range of test conditions and test materials. Based on these investigations, the important factors that govern the solid particle erosive wear of metallic materials at elevated temperature are described below. 

The velocity dependence of the erosion rate ( ) is characterized by the velocity exponent p given by 

10 (a) Variation of erosion rate with temperature for a number of alloys [37,38] (b) velocity exponent obtained by various investigators, plotted in velocity-temperature regime. 

The influence of impact angle on erosion rate at different temperatures for different test materials is presented in this section. However, most metallic materials, irrespective of temperature of erosion, exhibit a ductile behaviour, i.e. a maximum erosion rate at oblique impact angles (10° to 30°). The above observation is presented in Fig. 6.11, wherein the data from a large number of investigators have been compiled [41 6]. 

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