Analysis of Quenching Stresses in 35CrMo Axle  

作　　者：龚海 WU Yunxin FENG Xiaolei LI Yihua 

机构地区：[1]State Key Laboratory for High Performance Complex Manufacturing,Changsha 410083,China [2]School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China [3]School of Materials Science and Engineering,Central South University,Changsha 410083,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2016年第3期630-635,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Basic Research Program of China(Nos.2010CB731703,2012CB619505);the National Natural Science Foundation of China(Nos.51405520,51327902)

摘　　要：By using the finite element method （FEM）, we comprehensively analyzed the fields of temperature, organization, and stress in 35CrMo train axles during the quenching process is conducted, and experimentally studied the formation and evolution of inner stresses in axles during the quenching process. The results show that in the quenching process, stresses on the axle surface change from tensile to compressive gradually, while stresses in the axle core change from compressive to tensile gradually. Heat stresses and the amount of martensitic transformation are all increased with the increase of cooling rate. As a result, the maximmn instantaneous stresses in the axle are increased greatly when the cooling rate is increased with brine quenching. Large instantaneous tensile stress in the axle core with brine quenching is very likely to cause quench cracking and should be avoided.By using the finite element method （FEM）, we comprehensively analyzed the fields of temperature, organization, and stress in 35CrMo train axles during the quenching process is conducted, and experimentally studied the formation and evolution of inner stresses in axles during the quenching process. The results show that in the quenching process, stresses on the axle surface change from tensile to compressive gradually, while stresses in the axle core change from compressive to tensile gradually. Heat stresses and the amount of martensitic transformation are all increased with the increase of cooling rate. As a result, the maximmn instantaneous stresses in the axle are increased greatly when the cooling rate is increased with brine quenching. Large instantaneous tensile stress in the axle core with brine quenching is very likely to cause quench cracking and should be avoided.

关 键 词：35CrMo axle QUENCHING residual stress FEM X-ray diffraction 

分 类 号：TG162.71[金属学及工艺—热处理] TG156.3[金属学及工艺—金属学]