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| Hot Deformation Behavior and Constitutive Relationship for Super-Low Carbon 13Cr-5Ni-2Mo Martensitic Stainless Steel |
| ZHANG Wei1,YAN Dong-na2,ZOU De-ning2,LIU Huan2,HAN Ying2,FAN Guang-wei1 |
1. Technology Center, Shanxi Taigang Stainless Steel Co., Ltd.， Taiyuan 030003, Shanxi, China
2. School of Metallurgy and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China |
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Abstract The hot deformation behavior of super-low carbon 13Cr-5Ni-2Mo martensitic stainless steel was investigated by high temperature compression tests on a Gleeble-3800 thermal-mechanical simulator in the range of deformation temperature from 900 to 1200℃, strain rate from 0.1 to 50s-1. Microstructural evolutions under different working conditions were also analyzed. The constitutive equation of flow stress was formulated with Sellars’ hyperbolic sine model. The results show that the flow stress and the critical strain to the peak stress decrease with the increase in temperature and the decrement of strain rate. Meanwhile, the dynamic recovery turns to the dynamic re-crystallization, and recrystallization grains grow and then coarse gradually. In the high temperature range, the re-crystallization grain size decreases obviously with the increase of strain rate. The high accuracy of the developed constitutive equation is identified, which reveals that it can effectively reflex the high temperature mechanical behavior of the tested steel and provides valuable consults for numerical simulation in hot working.
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Received: 27 January 2011
Published: 22 May 2012
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2012, Vol. 47 
