Hot Deformation Behavior of As-cast AISI M2 High-speed Steel Containing Mischmetal  

作　　者：Ming-gui QU Shu-hua SUN Xing-hong BAI Zhong-ping SHI Yang GAO Wan-tang FU 

机构地区：[1]State Key Laboratory of Metastable Material Science and Technology,College of Material Science and Engineering, Yanshan University [2]College of Science,Yanshan University [3]China First Heavy Industries

出　　处：《Journal of Iron and Steel Research International》2014年第1期60-68,共9页

基　　金：Item Sponsored by National Natural Science Foundation of China(51101137,51171161);Science and Technology Research and Development Plan of Qinhuangdao of China(201101A100)

摘　　要：The hot deformation behavior of as-cast AISI M2 high-speed steel containing mischmetal （RE） has been investigated on a Gleeble-3500 simulator in the temperature range of 1000--1 150 ℃ and strain rate range of 0.01- 10 s 1 at true strain of 1.0. The mechanical behavior has been characterized using stress-strain curve analysis, kinetic analysis, processing maps, etc. Metallographic investigation was performed to evaluate the mechanism of flow insta- bility. The results show that the deformation activation energy decreases with increasing deformation temperature; the efficiency of power dissipation increases with decreasing strain rate and increasing temperature; flow instability is observed at low-to-medium temperature and higher strain rate region when the strain is smaller, but extends to lower strain rate and high temperature regions with the increment of strain, in which it is manifested as flow localization near the grain boundary. Hot deformation equations and processing maps are obtained. The optimal processing window is suggested and the deformation mechanism is dynamic recrystallization （DRX）.The hot deformation behavior of as-cast AISI M2 high-speed steel containing mischmetal （RE） has been investigated on a Gleeble-3500 simulator in the temperature range of 1000--1 150 ℃ and strain rate range of 0.01- 10 s 1 at true strain of 1.0. The mechanical behavior has been characterized using stress-strain curve analysis, kinetic analysis, processing maps, etc. Metallographic investigation was performed to evaluate the mechanism of flow insta- bility. The results show that the deformation activation energy decreases with increasing deformation temperature; the efficiency of power dissipation increases with decreasing strain rate and increasing temperature; flow instability is observed at low-to-medium temperature and higher strain rate region when the strain is smaller, but extends to lower strain rate and high temperature regions with the increment of strain, in which it is manifested as flow localization near the grain boundary. Hot deformation equations and processing maps are obtained. The optimal processing window is suggested and the deformation mechanism is dynamic recrystallization （DRX）.

关 键 词：as cast AISI M2 mischmetal flow stress activation energy hot deformation equation processing map 

分 类 号：TG142.45[一般工业技术—材料科学与工程] TQ323.4[金属学及工艺—金属材料]