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Effect of titanium microalloying on microstructure and mechanical properties of vanadium microalloyed steels for hot forging

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Abstract

Effect of titanium microalloying on the microstructure and mechanical properties of vanadium microalloyed steels for hot forging was studied. Titanium microalloying improves the mechanical properties mainly through refining the austenite grains. When the heating temperature is in the range of 1050–1300 °C, the austenite grain diameter is decreased from 77–133 to 26–68 μm by titanium microalloying. With the decrease in austenite grain diameter, the final microstructure is refined significantly, and the high misorientation boundaries are increased. After the steel is heated at 1200 °C (the common hot forging temperature) and cooled slowly, titanium microalloying decreases the yield strength from 548.4 to 519.4 MPa, and the tensile strength decreases from 842.7 to 808.7 MPa. However, the elongation increases from 19.0% to 21.4%, and the impact energy increases from 9.8 to 38.2 J. V–Ti steel has a better combination of strength, plasticity and toughness than V steel. In addition, the nucleation of intragranular ferrite idiomorphs is promoted by titanium microalloying, which may have a beneficial effect on the property of steels with coarse microstructure caused by the critical deformation in hot die forging.

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Acknowledgements

The authors appreciate the financial support by the China Postdoctoral Science Foundation (2019TQ0031), the Fundamental Research Funds for the Central Universities (FRF-TP-20-030A1) and the State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology (P2021-002).

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Authors and Affiliations

  1. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Fan Zhao, Zhi-hao Zhang & Jian-xin Xie

  2. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China

    Fan Zhao

  3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Guo-ning He & Ya-zheng Liu

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  1. Fan Zhao
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  2. Guo-ning He
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Correspondence to Zhi-hao Zhang.

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Zhao, F., He, Gn., Liu, Yz. et al. Effect of titanium microalloying on microstructure and mechanical properties of vanadium microalloyed steels for hot forging. J. Iron Steel Res. Int. 29, 295–306 (2022). https://doi.org/10.1007/s42243-021-00629-8

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  • DOI: https://doi.org/10.1007/s42243-021-00629-8

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