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Microstructural changes in the wear surface of high strength stainless austenitic steels

High strength CrMn steels alloyed with C or N or C+N were subjected to grooving or impact wear. The interstitial content ranged from 0.44 to 0.87 mass%. The bulk structure was characterized by internal friction and TEM, while the wear surface was inspected by TEM, XRD and magnetic response. The bulk is fully austenitic and the Snoek‐like relaxation reveals a “frozen splitting” caused by interstitial / substitutional complexes. Deformation induced ε‐martensite is found in the grooving wear surface, but traces of α‐martensite are present only in the specimen of lowest interstial content corresponding to the lowest stability of austenite. Neither XRD nor the magnetic response give evidence of α‐martensite in the impact wear surface.