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Investigations on hot deformation behaviors and abnormal variation mechanisms of flow stress at elevated temperature for X45CrSi93 valve steel

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Abstract

The hot deformation behavior of X45CrSi93 valve steel was investigated by a series of compression and tensile tests by means of the Gleeble-1500 simulator and microstructural analyses. The experimental results show that the flow stress decreases with the increasing temperature between 850 and 900 °C followed by an abnormal increase with the increasing temperature between 900 and 1000 °C under the compressive conditions. A normal decrease of the flow stress is continued with the increasing temperature above 1000 °C. Meantime, the tensile specimen conducted at 1000 °C shows double necking effect. Further microstructural analyses show that the phase transition from α-ferrite to austenite and the solution strengthening caused by carbide dissolution are the main reasons for abnormal variation of flow stress for X45CrSi93. The negative temperature gradient in the tensile specimen results in the symmetrical microstructure and then the double necking phenomenon.

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ACKNOWLEDGMENTS

The authors would like to thank for the financial support from MCC Capital Engineering & Research Incorporation Limited and the facilities provided by materials experimental test center in School of Materials Science and Engineering, University of Science and Technology Beijing.

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Authors and Affiliations

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

    Yunsheng Wu & Maicang Zhang

  2. MCC Capital Engineering & Research Incorporation Limited, Beijing, 100176, China

    Xudong Xu

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  1. Yunsheng Wu
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  2. Maicang Zhang
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  3. Xudong Xu
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Correspondence to Maicang Zhang.

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Contributing Editor: Jürgen Eckert

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Wu, Y., Zhang, M. & Xu, X. Investigations on hot deformation behaviors and abnormal variation mechanisms of flow stress at elevated temperature for X45CrSi93 valve steel. Journal of Materials Research 30, 1715–1726 (2015). https://doi.org/10.1557/jmr.2015.98

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  • DOI: https://doi.org/10.1557/jmr.2015.98

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