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Correlation of Cooling Rate, Microstructure and Hardness of S34MnV Steel

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Abstract

A study of the hardenability, the microstructure and the phase transformations as a function of the cooling rate, of a marine crankshaft S34MnV steel has been performed using a Jominy end-quench test and dilatometry tests. The cooling rate has a distinct influence on the hardness and microstructure characteristics. As the cooling rate decreases, the hardness drops from HRC53 at the quenched end to HRC22 at the top end of the Jominy bar. The corresponding microstructures change from hard martensite to bainite, then soft pearlite and ferrite. The critical temperatures Ac1, 740 °C and Ac3, 830 °C were determined, and a continuous cooling transformation diagram was constructed from the dilatometric data. The important role of cooling rate on final hardness, phase transformation and microstructures are analyzed.

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Acknowledgments

The authors would like to thank the Thermal Processing Technology Center (TPTC) of Illinois Institute of Technology for supporting this work, and thanks to Russ Janota, Yang Zhou, and Kathy Ho for their help in experimentation. This work was supported by Shanghai Heavy Castings and Forgings Collaborative Innovation Center (Grant Numbers ZF1225); Innovation Program of Shanghai Municipal Education Commission (Grant Numbers 12YZ183).

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, 333 Long Teng Road, Shanghai, 201620, P.R. China

    Zhiying Chen

  2. Thermal Processing Technology Center, Illinois Institute of Technology, 10 West 32nd Street, REC-243, Chicago, IL, 60616-3793, USA

    Philip Nash

  3. School of Materials Engineering, Shanghai University of Engineering Science, 333 Long Teng Road, Shanghai, 201620, P.R. China

    Ying Zhang

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  1. Zhiying Chen
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Correspondence to Zhiying Chen.

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Manuscript submitted December 10, 2018.

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Chen, Z., Nash, P. & Zhang, Y. Correlation of Cooling Rate, Microstructure and Hardness of S34MnV Steel. Metall Mater Trans B 50, 1718–1728 (2019). https://doi.org/10.1007/s11663-019-01621-0

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