Study on austenite grain growth behavior of 42CrMoA
Using a box type resistance furnace and a metallographic microscope,the effects of different Al con-tents and heat treatment processes on the grain size growth behavior of 42CrMoA were experimentally studied,and the laws of grain size growth behavior of the steel were determined under different Al contents,austenitizing tem-peratures,and corresponding holding times.The results show that the grain size growth behavior of 42CrMoA is di-rectly related to the aluminum nitrogen ratio and temperature,and the critical growth temperature of grain size de-creases with the decrease of aluminum nitrogen ratio.When the aluminum content is below 0.021,as the Al/N val-ue decreases,both the critical growth temperature and the abnormal growth temperature of grain size decrease.When the aluminum content is above 0.021,the critical abnormal growth temperature of grain size begins to in-crease.And when other chemical compositions are basically the same,there is a certain linear relationship between different Al contents and the grain size corresponding to the austenite temperature.
42CrMoAaustenite grain sizealuminum to nitrogen ratio
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