Numerical simulation and process parameter optimization of surface strengthening for 9310 aviation gear vacuum carburization heat treatment
To improve the fatigue performance of aviation gears,the 9310 aviation gears are strengthened by the vacuum carburizing heat treatment technology.The carbon concentration distribution and depth of the carburized layer on the surface are predicted by employing finite element simulation analysis method.The vacuum carburizing process parameters are optimized based on orthogonal experimental method,and finally the gear vacuum carburizing test is conducted.Our test obtains the optimal optimization process parameter with a carburizing temperature of 960℃and the carbon concentration on the tooth surface at the beginning and end of the strong carburizing pulse reaches 0.84%and 1.80%respectively.After carburizing,the tooth surface is needle-like martensite in microstructure whereas the core is mainly lath-like martensite and some residual austenite in microstructure.The maximum hardness of the surface is 740HV while the maximum hardness of the core is 402HV.Our optimized process parameters effectively improve the depth of the carburized layer and the standard point carbon concentration.Compared with the pre-optimization carburized layer standard point carbon concentration,the optimized process parameters increase the standard point carbon concentration by 21.2%.
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