Experiment and Simulation on Temperature Field of 40Cr Steel Surface Layer in Grind-Hardening

摘要

The grinding heat is utilized to induce martensitic phase transformation and strengthen the surface layer of 40Cr steel by raising surface temperature higher than austenitic temperature and cooling quickly. Experiment was performed with the different grinding conditions. Semi-natural thermocouple is used to measure the temperature field development of 40Cr steel surface layer in grind-hardening. Temperature field development of alloy steel 40Cr is simulated by finite element method in grind-hardening. Comparison between simulated results obtained from the finite element model and experiment results reveals a good agreement. The maximal surface temperature is smaller when the table speed is slower, but the hardness depth is deeper. The finite element model can predict grind-hardening result to reduce the experiment cost and time.