Rolling contact fatigue property and failure mechanism of carburized 30CrSiMoVM steel at elevated temperature

摘要

Rolling contact fatigue (RCF) behavior of carburized 30CrSiMoVM steel was experimentally investigated at elevated temperature. The results show that RCF crack was drive by asperity contact rather than the orthogonal shear stress or the maximum shear stress. The value of L-10, L-50, La life at 100 degrees C decreased by 48.3%, 44.1%, 43.2%, respectively, compared with that at 40 degrees C, which was attributed to lubrication status changing from mixed lubrication regime to boundary lubrication regime. The formation of the synergistic tribofilm containing Fe2O3, FeS, ZnS, FePO4 and Ca-3(PO4)(2) around the center of the contact area effectively prevented initiation and propagation of RCF crack under boundary lubrication status, resulting in the obvious variation of the failure mode of the carburized layer. (C) 2016 Elsevier Ltd. All rights reserved.