B. Z. Bai X.J.Sun and L.Y.Yang 1) Department of Materials Science and Engineering
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Tsinghua University
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Beijing 100084
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China 2) Beijing Research Institute of Mechanical and Electrical Technology
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Beijing 100083
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China
金属学报(英文版)
Gleeble1500 thermo-mechanical simulation machine is considered to be the first grade equipment in materials' research. However, it is seldom used in superplastic research. Perhaps this is because its specimen's heating method is not suitable to get large elongation. Elongation is an important parameter to evaluate superplasticity, but some other parameters such as the relationship between stress and strain rate are more important than elongation-it is an essential property to superplasticity. The stress-strain rate relationship can be very easily and very accu- rately got with Gleeble machine than with some other simlar equipment, and the relationship between microstructure and superplastic deformation is more easily examined with Gleeble. Present authors have got some new achievement in anisotropy, heterogeneity of superplastic deformation, and first put forward the regulation of dynamic equilibrium in microstructural evolution during superplastic deformation. All of these have been concluded from the experimental results mainly through Gleeble as well as the microstructural examination.The research work has got the support of National Natural Science Foundation and some international cooperation. Some theoretic and experimental results have been used in the practice of superplastic forming. Obvious effect of reducing cost and improving quality of formed parts has been achieved.
关键词:
thermo-mechanical simulation
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null
靳永明
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张宜生
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梁卫抗
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郑徐雨
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李阳
机械工程材料
doi:10.11973/jxgccl201604018
在Gleeble 3500型热力模拟试验机上对22MnB5超高强度钢在不同加热速率(10~100℃·s-1)下进行了奥氏体化,研究了加热速率对奥氏体化温度Ac1,Ac3及奥氏体转变时间的影响,并建立了加热速率与Ac1的关系式.结果表明:该钢的Ac1与Ac3都随着加热速率的增大而升高;当加热速率低于25℃·s-1时,Ac1随加热速率的增大快速升高,当高于25℃·s-1时,Ac1缓慢升高并趋向恒定;随着加热速率的提高,奥氏体化温度区间(Ac3~Ac1)大小呈升高趋势,奥氏体转变时间缩短.
关键词:
22MnB5超高强度钢
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热力模拟
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加热速率
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奥氏体化
