ED-102高速列车制动盘用钢的过冷奥氏体连续冷却转变  

Continuous cooling transformation of under-cooled austenite of ED-102 steel for high-speed railway vehicle brake disc

作　　者：文辉 李英奎 于良机 王福明[2] WEN Hui;LI Yingkui;YU Liangji;WANG Fuming(Nanjing Iron and Steel Co.Ltd.,Nanjing 210035,China;School of Metallurgical and Ecological Engineering,University of Science&Technology Beijing,Beijing 100083,China)

机构地区：[1]南京钢铁股份有限公司,江苏南京210035 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《现代交通与冶金材料》2021年第5期74-77,88,共5页Modern Transportation and Metallurgical Materials

摘　　要：为控制ED-102制动盘用钢的组织及了解其相变温度,利用L78RITA/D热膨胀仪测定了ED-102高速列车制动盘用钢的过冷奥氏体连续冷却转变曲线。并研究了ED-102钢不同冷速下的微观组织和硬度。结果表明该钢的相变温度A_(c3)=839℃;A_(c1)=751℃,高于紧急制动过程中的制动盘盘面温度。试验钢的CCT曲线明显右移,没有产生铁素体组织,且马氏体临界转变速率较低,这是由于钢中Ni,Mo元素含量较高,V含量较低。ED-102制动盘用钢为获得优良的马氏体组织,冷却速度应大于10℃/s。In order to control the microstructure of ED-102 brake disc steel and identify its trans-formation temperature,the continuous cooling transformation(CCT)curves of under-cooled austenite of ED-102 brake disc steel for high speed train was measured by L78RITA/D thermal dilatometer.The microstructure and hardness of ED-102 steel at different cooling rate were investigated.The result reflects the transformation temperature of the steel is A_(c3)=839 ℃;A_(c1)=751 ℃,higher than the brake disc surface temperature during emergency braking.The CCT curve shifts to right obviously,there is almost no ferrite microstructure,and the critical transformation rate of martensite is low,which is due to the high contents of Ni,Mo and Mn and low content of V in the steel.In order to obtain excellent martensite structure,the cooling rate of ED-102 brake disc steel shall be faster than 10 ℃/s.

关 键 词：ED-102钢 过冷奥氏体 CCT曲线 马氏体 

分 类 号：TG151.3[金属学及工艺—热处理]