Abstract
Nanocrystalline structures in the worn surfaces of quenched and tempered steels were obtained in a dry sliding friction process. The ultrafine and even nano grains with sizes about 50nm and 200nm were observed in the sliding friction-induced deformation layers (SFIDLs) of 20CrMnTi disc and T10 steel pin. The mechanism of forming nanocrystalline structure in SFIDLs was elucidated as the result of severe shear deformation induced by dry sliding friction. Two methods for estimating shear stain as proposed by Douthwaite and Sato, respectively, were used to evaluate their induced equivalent strains and to obtain the critical shear strains for ultra-refined or nanocrystalline structures formation in the worn surfaces.
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