Influence of Initial Microstructure on Warm Deformation Processability and Microstructure of an Ultrahigh Carbon Steel

Various isothermal compression tests are carried out on an ultrahigh carbon steel （1.2% C in mass percent）, initially quenched or spheroidized, using a Gleeble-3500 system. The true stress is observed to decrease with increas ing temperature and decreasing strain rate. The true stress of the initial...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2014, Vol.21 (1), p.52-59
Main Authors: WU, Tao, GAO, Yu-wei, WANG, Ming-zhi, LI, Xiao-pu, ZHAO, Yu-cheng, ZOU, Qin
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Cements
Deformation
deformation activation energy
Engineering
high angle boundary
High carbon steels
initially quenched steel
initially spheroidized steel
Iron and steel industry
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Physical Chemistry
Processes
Quenching (cooling)
Spheroidizing
Steels
Strain rate
ultrahigh carbon steel
低应变速率
加工性能
微观结构
显微结构
温变形
等温压缩试验
超高碳钢
透射电子显微镜
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Summary:Various isothermal compression tests are carried out on an ultrahigh carbon steel （1.2% C in mass percent）, initially quenched or spheroidized, using a Gleeble-3500 system. The true stress is observed to decrease with increas ing temperature and decreasing strain rate. The true stress of the initially quenched steel is lower than that of the ini- tially spheroidized steel at high deformation temperature （700 ~C） and low deformation strain rate （0. 001 s-1 ）. The value of the deformation activation energy （Q） of the initially quenched steel （331.56 kJ/mol） is higher than that of the initially spheroidized steel （297.94 kJ/mol）. The initially quenched steel has lower efficiency of power dissipation and better processability than the initially spheroidized steel. The warm compression promotes the fragmentation and the spheroidization of lamellar cementites in the initially quenched steel. The fragmentation of lamellar cementites is the spheroidizing mechanism of the eementites in the initially quenched steel. Results of transmission electron microscope investigation showed that fine grains with high angle boundaries are obtained by deformation of the initially quenched steel.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(14)60009-1