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Austenite grain growth of medium-carbon alloy steel with aluminum additions during heating process

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Abstract

In this study, the effects of heating temperature (850–1100°C) and holding time (30–150 min) on the grain growth behavior of austenite in medium-carbon alloy steel were investigated by conducting experiments. The abnormal grain growth and mixed grain structure phenomenon are explained using an equilibrium precipitation phase diagram calculated by Thermo-Calc software package. The AlN particles were observed by field-emission scanning electron microscopy (FESEM), and the amount of AlN precipitations was detected by electron probe microanalysis (EPMA). Based on the research results, it was found that the average grain size of austenite in the test steel increased continuously with the increase of temperature and holding time. Furthermore, the abnormal growth of austenite occurred in the test steel at 950°C, and the heating temperature affected the austenite grain size more significantly. In addition, the decline in the amount of AlN second-phase particle in the test steel, which weakened the “pinning” effect on austenite grain boundaries, resulted in abnormal growth and the development of mixed austenite grain structures. The prediction model for describing the austenite grain growth of medium-carbon alloy steel during heating was established by regression analysis of the experimental data, and the model was verified to be highly accurate.

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Acknowledgement

This work was financially supported by the National Natural Science Foundation of China (No. 51774037).

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Authors and Affiliations

  1. State key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Zi-yi Liu, Yan-ping Bao, Min Wang & Xin Li

  2. Xiangtan Iron & Steel Co., Ltd. of Hunan Valin, Xiangtan, 411101, China

    Fan-zheng Zeng

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  1. Zi-yi Liu
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Correspondence to Yan-ping Bao.

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Liu, Zy., Bao, Yp., Wang, M. et al. Austenite grain growth of medium-carbon alloy steel with aluminum additions during heating process. Int J Miner Metall Mater 26, 282–290 (2019). https://doi.org/10.1007/s12613-019-1736-6

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  • DOI: https://doi.org/10.1007/s12613-019-1736-6

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