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| Strain- induced Precipitation in Ti Micro- alloyed Interstitial- free Steel |
| Ya- jun HUI,Yang YU,Lin WANG,Chang WANG,Wen- yuan LI,Bin CHEN |
| Sheet Metal Research Institute, Shougang Research Institute of Technology, Beijing 100043, China |
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Abstract Stress relaxation method was carried out on a Ti micro- alloyed interstitial- free (IF) steel at the temperature ranging from 800 to 1000 ��. The results show that the softening kinetics curves of deformed austenite can be divided into three stages. At the first stage, the stress has a sharp drop due to the onset of recrystallization. At the second stage, a plateau appears on the relaxation curves indicating the start and finish of strain- induced precipitation. At the third stage, the stress curves begin to descend again because of coarsening of precipitates. Precipitation- time- temperature (PTT) diagram exhibited a ��C�� shape, and the nose point of the PTT diagram is located at 900 �� and the start precipitation time of 10 s. The theoretical calculation shows that the strain- induced precipitates were confirmed as almost pure TiC particles. The TiC precipitates were heterogeneously distributed in either a chain- like or cell- like manner observed by transmission electron microscopy (TEM), which indicates the precipitates nucleated on dislocations or dislocation substructures. In addition, a thermodynamic analytical model was presented to describe the precipitation in Ti micro- alloyed IF steel, which shows a good agreement between the experimental observation and the predictions of the model.
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Received: 11 February 2015
Published: 14 April 2016
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| [1] |
Wei-hua CHEN,Juan LIU,Zhen-shan CUI,Ying-jie WANG,Ying-rui WANG. A 2.5-dimensional Analytical Model of Cold Leveling for Plates with Transverse Wave Defects[J]. Chinese Journal of Iron and Steel, 2015, 22(8): 664-671. |
| [2] |
HU Bin-hao,CAI Qing-wu,WU Hui-bin. Kinetics of Precipitation Behavior of Second Phase Particles in Ferritic Ti-Mo Microalloyed Steel[J]. Chinese Journal of Iron and Steel, 2013, 20(7): 69-77. |
| [3] |
XIAO Hong,,YUAN Zheng-wen,,WANG Tao,. Roll Flattening Analytical Model in Flat Rolling by Boundary Integral Equation Method[J]. Chinese Journal of Iron and Steel, 2013, 20(10): 39-45. |
| [4] |
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| [5] |
Fang Fang Qilong Yong Caifu Yang Hang Su. [J]. Chinese Journal of Iron and Steel, 2010, 17(2): 36-42. |
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2016, Vol. 23 
