Abstract
When metallic materials are severely deformed only on its surface, deformation-induced layer is often formed. The deformation layer has very fine microstructure and high hardness. In this study, formation behavior of deformation-induced layer in Fe-Ni alloy by shot peening and sliding wear was investigated. The deformation-induced layer formed by sliding wear has only austenite phase and fine microstructure. On the other hand, the deformation layer induced by shot peening has small grains and consists of both austenite and martensite phases. It is considered that the difference of these microstructures between shot-peened specimen and worn specimen comes from surface temperature generated during deformation. Moreover, there is no dependence of initial microstructure on the microstructure of deformation-induced layer. From the obtained results, it is found that the microstructure of the deformation-induced layer depends on the deformation method.
