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| Austenite grain growth behavior of X80 pipeline steel containing vanadium |
| LI Long-fei1, ZHANG Yang2, LIN Teng-chang1, MENG Hua-dong1, HE Qing1, YAO Tong-lu1 |
1. Department of Metallurgical Technology Research, Central Iron and Steel Research Institute,Beijing 100081, China;
2. Institute of Steelmaking Engineering Technoogy, MCC Capital Engineering andResearch Incorporation Limited, Beijing 100176, China |
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Abstract In order to make clear the influence of vanadium addition on the austenitizing process of X80 pipeline steel, the austenite grain growth behavior of 4 experiment steels with different vanadium contents (0%, 0.042%, 0.084%, 0.130%) under different austenitizing temperatures was investigated, and the austenite grain growth kinetics in the experimental steel was analyzed and calculated by Thermo-Calc thermodynamic calculation, austenitizing heating treatment, metallographic analysis and theoretical model derivation and calculation. The results show that as the soaking temperature is lower than 1 050 ℃, the austenite grain size and change trend of 4 experimental steels with different vanadium contents are similar. But when the soaking temperature is higher than 1 050 ℃, the austenite grain size of vanadium free experimental steel is significantly higher than that of experimental steels containing vanadium. With vanadium contents increasing, the number of vanadium containing precipitates increasesHowever, due to its low solution temperature, vanadium content has little effect on austenite grain growth of vanadium containing steels. The austenite grain size of experimental steel grew up with the increase of austenitizing temperature. When the soaking temperature was in the range of 850-900 ℃, the austenite grains grew slowly, while the austenite grain sizes increased rapidly when the soaking temperature was higher than 1 200 ℃. The austenite grain sizes of 4 experimental steels increased exponentially with the increase of soaking temperature. At the same austenitizing temperature, the austenite grain size increased with the increase of soaking time, and the growth rate gradually decreased. The measured experimental data combined with the grain growth kinetics theory were used to establish a mathematical model of No.2 experimental steel containing 0.042% vanadium content, 公式, which was verified and fitting result was good. The research and experimental conclusions obtained in this paper can provide a theoretical basis for the thermo mechanical control process parameter design and engineering application of vanadium containing X80 pipeline steel.
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Received: 15 September 2021
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2022, Vol. 57 
