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| Strain- induced precipitation behavior of second phase particles in high strength IF steel |
| YU Yang1,2，HUI Ya- jun1,2，WANG Chang1,2，WANG Lin1,2，WU Nai3，WANG Ming- zhe3 |
（1. Strip Technology Department, Research Institute of Technology, Shougang Group Corporation, Beijing 100043, China
2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production,Beijing 100043, China
3. Manufacturing Department, Beijing Shougang Co., Ltd., Qian′an 064404, Hebei, China） |
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Abstract The precipitation behavior of the second phase particles in P- bearing high strength IF steel was studied by using stress relaxation method on Gleeble- 3500 thermal- mechanical simulator. The results showed that the stress relaxation curve could be divided into three stages because of the pinning effect of precipitates of alloy elements on the dislocations and grain boundaries, and therefore the precipitation- time- temperature （PTT） curve showed a typical "C" shape. The precipitation temperature at the nose point was about 850 ℃, with the precipitation- start time of 14 s and the precipitation- end time of 246 s, respectively. With the extension of the isothermal relaxation time, the amount of the second phase particles increased gradually, and the appearance grew coarsening during this process. The spherical shape Ti4C2S2 and TiC precipitates were observed. The FeTiP precipitate, which presented as the bar or rectangular shape, was found in the second phase particles because the focused steel was alloyed with P element. Caused by the segregation of P at the grain boundary, the FeTiP precipitate was mainly located along the grain boundary.
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Received: 23 March 2018
Published: 24 July 2018
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Corresponding Authors:
Yang YU
E-mail: yyhpd@163.com
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2018, Vol. 28 
