Effect of Rolling Process on Microstructure and Properties of 95CrMo Drill Steel  

作　　者：Wei YU Bao-sheng XIE Ban WANG Qing-wu CAI Shi-xin XU 

机构地区：[1]National Engineering Research Center of Advanced Rolling,University of Science and Technology Beijing [2]Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing

出　　处：《Journal of Iron and Steel Research International》2016年第9期910-923,共14页

基　　金：Sponsored by National Science and Technology Pillar Program during the Twelfth Five-year Plan Period of China(2012BAE03B01)

摘　　要：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 0.95, which indicated a high reliability of the relationship. By analyzing the individual strength contributions of pearlite structures, yield strength was found to have a more great dependence on pearlite inter-lamellar spacing than colony size.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 0.95, which indicated a high reliability of the relationship. By analyzing the individual strength contributions of pearlite structures, yield strength was found to have a more great dependence on pearlite inter-lamellar spacing than colony size.

关 键 词：pearlitic steel controlled rolling controlled cooling MICROSTRUCTURE mechanical property strength model 

分 类 号：TG335[金属学及工艺—金属压力加工] TG142.1[一般工业技术—材料科学与工程]