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| Kinetics of strain induced precipitation of TiC by hot compression method |
| WANG Zhi-yong1，SONG Xin1，WANG Zhen-qiang2，LIU Chun-ming2，SUN Xin-jun3 |
（1. Department of Rolling Steel，Qinhuangdao Shouqin Metal Materials Co.，Ltd.，Qinhuangdao 066000，Hebei，China
2. Plate Technology Department， Shougang Research Institute of Technology，Beijing 100043， China
3. Department of Engineering Steels， Central Iron and Steel Research Institute，Beijing 100081，China） |
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Abstract The kinetics of strain induced precipitation in a 0.047%C-0.109%Ti micro-alloyed steel was studied by a stress relaxation (SR)method， a two-stage interrupted compression (TS) method and transmission electron microscopy (TEM)in Gleeble 1500D thermal testing. Three groups of precipitation-time-temperature (PTT) diagrams were obtained by analyzing stress relaxation curves， softening kinetic curves and the amounts and sizes of strain induced precipitates at various isothermal holding times. The results showed that the PTT diagrams by three methods all exhibited typical “C” shape， and the nose temperatures of them located at approximately 900 ℃. The two-stage interrupted method shows the highest reliability and sensitivity in terms of the determination of the onset time of precipitation[（Ps）]. TEM results showed that the strain induced precipitates identified with fcc structure (B1 NaCl structure) were pure TiC particles， and were distributed in a chain-like and a cell-like manner on carbon replica. In addition， the precipitates followed a parabolic law (1/2 law) during the growth stage， and obeyed a 1/10 law during the coarsening stage.
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Received: 29 December 2014
Published: 12 October 2015
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2015, Vol. 50 
