Austenite Grain Growth Law of High-strength Steel for Offshore Engineering

Abstract:

The metallographic analysis method is used to study the original austenite grain change law of Nb-containing high-strength ship steel. Adding Nb to the experimental steel will refine the grains to a certain extent. Different Nb content, the corresponding grain size change trend is different. Under the experimental heating environment of 850°C~1150°C, the grains of the two experimental steels have different degrees of coarsening at different heating temperatures. Compared with the low-C and high-Nb steel (EH36) with the high-C and low-Nb steel (AH36), the former can not only control the austenite grain growth well at lower temperature, but also has a strong inhibitory effect in a higher temperature environment. Based on the experimental data, the austenite grain growth kinetic model of the two experimental steels at the heating temperature of 850°C~1150°C is obtained.

• Periodical: Materials Science Forum (Volume 1054)
• Pages: 57-62
• DOI: https://doi.org/10.4028/p-1bg9xe
• Online since: February 2022
• Authors: Zheng Peng Han, Wei Hua Sun, Guo Bao Li, Ping Zhou, Dian Xiu Xia*, Xiu Cheng Li, Ying Chao Pei
• Keywords: Austenite Grains, Growth Dynamics, High-Strength Offshore Steel Containing Nb

References

[1] F. Vercruysse, C. Celada-Casero, B.M. Linke, et al. The effect of Nb on the strain rate and temperature dependent behaviour of quenching & partitioning steels, J. Materials Science & Engineering A. 169 (2020) 110612.

DOI: 10.1016/j.msea.2020.140293

[2] Jian.kai. L, Yong. L, Chun.xu. W, et al. Mathematical model of austenite grain growth for A315 steel, J. Heat Treatment of Metals. 041 (2016) 183-189.

[3] Yang. Z, Xiao.hua. L, Yong.chang. L, et al. Study of the kinetics of austenite grain growth by dynamic Ti-rich and Nb-rich carbonitride dissolution in HSLA steel: In-situ observation and modeling, J. Materials Characterization. 169 (2020)110612.

DOI: 10.1016/j.matchar.2020.110612

[4] Chang.fu. D, Qing. Y, Guang. X, et al. Effect of Nb on microstructure and properties of hot rolled low carbon bainite steel, J. Heat Treatment of Metals. 045 (2020) 197-200.

[5] Yan. C, Dan.tian. Z, Yong.chang. L, et al. Effect of dissolution and precipitation of Nb on the formation of acicular ferrite/bainite ferrite in low-carbon HSLA steels, J. Materials Characterization, 84 (2013) 232-239.

DOI: 10.1016/j.matchar.2013.08.005

[6] E.I. Hernandez-Duran, L. Corallo, T. Ros-Yanez, et al. Influence of Mo-Nb-Ti additions and peak annealing temperature on the microstructure and mechanical properties of low alloy steels after ultrafast heating process, J. Materials Science & Engineering A. 808 (2021) 140928.

DOI: 10.1016/j.msea.2021.140928

[7] M.C. Jo, J. Yoo, S. kim, et al. Effects of Nb and Mo alloying on resistance to hydrogen embrittlement in 1.9GPa-grade hot-stamping steels, J. Materials Science & Engineering A. 789 (2020) 139656.

DOI: 10.1016/j.msea.2020.139656

[8] M. Hillert. On the theory of normal and abnormal grain growth, J. Acta Metallurgica. 013 (1965) 227-238.

DOI: 10.1016/0001-6160(65)90200-2

[9] Zhi.ying. L, Chun.xu. W, Xian.ming. L, et al. Effect of trace Nb element on austenite grain growth of DT300 steel, J. Material & Heat Treatment. 041 (2012) 110-115.

[10] Chan. J, Ya.zheng. L, Zhao.lei. Z, et al. Dynamic observation and analysis of austenite grain growth and inclusions in spring steel containing niobium, J. SPECIAL STEEL. 032 (2011) 58-60.

[11] Zhir.ong. Y, Des.heng. Y, Huai.jun. Y. Effect of quenching process and Nb element on grain size of pre-austenite of 30MnB5 steel, J. Heat Treatment of Metals. 045 (2020) 218-221.

[12] Xiang. L, Qun. li. D, Xin. L. Effect of heating process on austenite grain growth of Nb-Ti microalloyed steel, J. Iron and Steel. 054 (2019) 120-131.

[13] Lei. Z, Thomas. K. Austenite grain growth and microstructure control in simulated heat affected zones of microalloyed HSLA steel, J. Materials Science & Engineering A. 613 (2014) 326-335.

DOI: 10.1016/j.msea.2014.06.106

[14] L.M. Fu, H.R. Wang, W. Wang. Austenite grain growth prediction coupling with drag and pinning effects in low carbon Nb microalloyed steels, J. Materials Science and Technology. 027 (2011) 996-1001.

DOI: 10.1179/1743284711y.0000000001

[15] Jian.guo. Y, Gui.ying. Q. The effect of Nb(C,N) dissolution on the grain growth behavior of high-niobium austenite, J. China Metallurgy. 029 (2019) 52-57.

[16] T. Kinoshita, M. Ohno. Phase-field simulation of abnormal grain growth during carburization in Nb-added steel, J. Computational Materials Science. 177 (2020) 109558.

DOI: 10.1016/j.commatsci.2020.109558

[17] Bo. L. Austenite grain growth model and application during structural steel heating, J. Hot Working Technology. 042 (2013) 80-82.

[18] Shuai. Y, Zheng. T, Lin.xiu. D. Study on the Kinetics of Austenite Grain Growth of Medium Manganese Steel, J. Hot Working Technology. 049 (2020) 128-130.