Abstract
Know-how of microstructural developments during erosion of 52100 and M50 tribological steels and associated erosion resistance knowledge are required for enhancement of properties. Erosion induced microstructural features such as disintegration of martensite boundaries, normal growth of martensite lath, low angle grain boundaries, shear bands, dislocation cell structure and independent recovery islets. Fraction of low angle grain boundary was larger after oblique erosion of 52100 steel while less shear bands were produced after oblique erosion compared to normal erosion. 52100 steel also developed independent recovery islets with tight packed dislocation wall and recovered cell interior. M50 ferrite developed dislocation cell structure during normal erosion. In general normal impact has been associated with greater erosion resistance. Comparatively less ploughing has increased erosion resistance of M50 ferrite than that of M50 martensite. Normal erosion resistance of 52100 and M50 martensite has been observed to be equal.
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