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Effect of Rolling Process on Microstructure and Properties of 95CrMo Drill Steel
Affiliation:1. National Engineering Research Center of Advanced Rolling,University of Science and Technology Beijing, Beijing 100083,China;2. Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China
Abstract:In order to improve the strength and toughness of 95CrMo steel and explore a short flow process,a direct rolling process was employed,and the effect of finishing rolling process on microstructure and mechanical properties was investigated.The results show that,with the decrease of finishing rolling temperature,inter-lamellar spacing in-creases,the strength as well as hardness has a general increase,and secondary cementite is distributed uniformly but represents a remarkable decrease in size.Based on Hall-Petch type equation,an effective relationship of yield strength and pearlite structure parameters was established.The correlation coefficients between the measured and calculated strength were more than 0.9 5 ,which indicated a high reliability of the relationship.By analyzing the indi-vidual strength contributions of pearlite structures,yield strength was found to have a more great dependence on pearlite inter-lamellar spacing than colony size.
Keywords:pearlitic steel  controlled rolling  controlled cooling  microstructure  mechanical property  strength model
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