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| Strain induced precipitation of second phase in titanium microalloyed IF steel |
| HUI Ya-jun1，YU Yang1，WANG Lin1，WANG Chang1，CHEN Bin1，CHEN Jin2 |
（1. Sheet Metal Research Institute， Shougang Research Institute of Technology， Beijing 100043， China
2. Qian’an Iron and Steel Company， Shougang Co.， Ltd.， Qian’an 064404， Hebei， China） |
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Abstract The second phase precipitation behavior of the Ti-microalloyed interstitial free steel was studied by using stress relaxation method on Gleeble 3500 thermal simulation testing machine. The results showed that the strain induced curves showed three stages，which was caused by precipitation. The precipitation - time - temperature curve of the Ti-IF steel showed a typical "C "shape， the fastest precipitation temperature was about 900 ℃ which was called nose point. And the start and finish time of the second phase precipitation were 10 seconds and 160 seconds， respectively at 900 ℃. With the increase of the isothermal relaxation time， the number of precipitates increased significantly. When the relaxation time exceeded the finish time of precipitation， the amounts of precipitates increased hardly. And the precipitates will grow during the precipitation process. Three kinds of precipitates were observed in Ti-IF steel， which were TiN， Ti4C2S2， and TiC. Because of almost the same shape and size of Ti4C2S2 and TiC precipitates， they can’t be distinguished from each other. And they were easy to precipitate along the austenite grain boundaries or sub-grain boundaries， sub-grain size of Austenite distributed 0.1-0.4μm. Strain-induced precipitation amount at 900 ℃ was more than that of 800 ℃， which is consistent with the results of PPT curve. For Ti-IF steel， in order to obtain coarse and sparse second phase particles， the hot-rolled process of "three low and one high" rapid and large depress should be adopted to improve the drawability.
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Received: 06 May 2015
Published: 06 January 2016
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2016, Vol. 51 
