Characterization on Mechanical Properties of Carburized Layer at Gear Root Based on Nano-Indentation Technology
XIE Zhiyong1, XIE Lijing1, GAO Feinong1, WANG Xibin1, REN Yan2, LI Hongwei2
1. Key Laboratory of Fundamental Science for Advanced Machining, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;
2. NORINCO Group Beijing North Vehicle Group Corporation, Beijing 100072, China
The carburized layer at 18Cr2Ni4WA steel gear root has mechanical behavior different from the substrate. Its accurate characterization is important for the analysis on the crack initiation and fatigue properties of the gear root. The nano-indentation test is taken as the test measure for the characterization of the local mechanical behavior in the carburized layer. Nano-indentation tests are carried out within the carburized layer. The finite element simulations of nano-indentation tests with different sets of constitutive model parameters combination are performed. Based on the simulated and the experimental load-displacement curves, the combined prediction errors of curvature, residual depth and the ratio of plastic deformation work to total deformation work are calculated. In result, the constitutive model parameters are defined for the carburized layer. It is verified that the constitutive model derived by this method can reflect the mechanical behavior of the
carburized layer.
2023, 
