Breakdown Behavior of Eutectic Carbide in High Speed Steel During Hot Compression  

作　　者：ZHOU Bin SHEN Yu CHEN Jun CUI Zhen-shan 

机构地区：[1]National Engineering Research Center of Die and Mold CAD, Shanghai Jiao Tong University, Shanghai 200030, China

出　　处：《Journal of Iron and Steel Research International》2011年第1期41-48,共8页

基　　金：Item Sponsored by National Key Basic Research and Development Program of China(2006CB705401);National Natural Science Foundation of China(50675133)

摘　　要：The evolution of euteelie carbide in as CaSl M2 high speed steeL was invesligated with hot compression test and metallographic examination. Initial rodlike or irregular eutectic carbides were broken into smaller particles during hot deformation by thermomechanical disintegration, while diffusion controlled phase transformation was not remarkable. Combining with numerical simulation, the relationship between breakdown ratio of carbide network and deformation parameters was obtained. Strain was the most important driving force to shatter euteclic carbides and disperse products. Furthermore, critical strain values were obtained, beyond which carbide network disappeared, and fractured carbides kept a stable profile and they were deformed with matrix coordinately. A higher temperature or lower strain rate resulted in a lower crilical strain.The evolution of euteelie carbide in as CaSl M2 high speed steeL was invesligated with hot compression test and metallographic examination. Initial rodlike or irregular eutectic carbides were broken into smaller particles during hot deformation by thermomechanical disintegration, while diffusion controlled phase transformation was not remarkable. Combining with numerical simulation, the relationship between breakdown ratio of carbide network and deformation parameters was obtained. Strain was the most important driving force to shatter euteclic carbides and disperse products. Furthermore, critical strain values were obtained, beyond which carbide network disappeared, and fractured carbides kept a stable profile and they were deformed with matrix coordinately. A higher temperature or lower strain rate resulted in a lower crilical strain.

关 键 词：hol compression high speed steel eulectic earbidc breakdown mechanism 

分 类 号：TG142.45[一般工业技术—材料科学与工程] TG142.71[金属学及工艺—金属材料]