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| Effect of High Temperature Relaxation?Process on Ultra Low Carbon Bainite Steel Without Nb, Ti and Other Elements |
| LIU Qing-suo, YANG Wei-wei, YUAN Lian-jie, GAO Bin, MENG Liang |
| School of Materials Science and Engineering， Tianjin University of Technology, Tianjin 300384, China |
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Abstract For the experimental steel the middle temperature phase transition point features of the high temperature relaxation?process of the experimental steel, the isothermal phase composition under the 450 ℃, the state of microstructure, and the hardness when the isothermal time changes were studied. In order to get the new knowledge of the effect of high temperature relaxation?process to the ultra low carbon steel without Nb, Ti alloy compounds precipitate elements’ bainite transition. The results show that high temperature relaxation?process significantly affected the experimental steel’s medium temperature transformation point. Although the CCT curve had two section characteristic, it moved to the left above compared with the samples which did not go through high temperature relaxation?process. The dislocation cell structure forming in the high temperature relaxation?process led to the forming of lath bunchy bainite with smaller size under 450 ℃ short-term isothermal, and the steel have a higher level of hardness. With the extension of isothermal time, the bainite grew up, and the hardness declined. While the samples without high temperature relaxation?process went through deformation-recovery process and bainite transformation process under the same 450 ℃. These two processes both had an effect on the steel’s hardness by working together to make the hardness change slowly when the isothermal time was less than 30 min.
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Received: 16 December 2013
Published: 05 August 2014
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2014, Vol. 49 
