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Effect of Quenching Process on Microstructures and Mechanical Properties of Fe-0.9Mn-0.5Cr-2.4Ni-0.5Mo-C Steel

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Abstract

To develop an appropriate quenching process to produce Fe-0.9Mn-0.5Cr-2.4Ni-0.5Mo-C steel, the microstructures and mechanical properties of this steel were investigated under the direct quenching and tempering (DQT) and the direct quenching, reheated quenching and tempering (DQQT) heat treatment processes. The microstructure of the DQQT specimen was basically tempered sorbite with spherical precipitates, while quite a bit of tempered martensite was in the DQT specimen with dispersive nanoscaled precipitates. The yield strengths of the DQT and DQQT specimens were 1154 and 955 MPa, respectively. The yield strength of the DQT specimen was higher than that of the DQQT specimen because of its finer grain size, higher density of dislocations and dispersed precipitates. The DQQT specimen had spherical precipitates, which hindered the propagation of the crack. Moreover, the high-angle grain boundaries in the DQQT specimen took a higher proportion. Therefore, the Charpy impact values of DQT and DQQT specimens at − 60 °C were 38 and 75 J, respectively. Consequently, the mechanical properties of the Fe-0.9Mn-0.5Cr-2.4Ni-0.5Mo-C steel, which met the standard of 1000 MPa grade steel plate for hydropower station, were acquired by the DQQT process.

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Acknowledgments

The authors are very grateful to the financial support of the National Natural Science Foundation of China (51274062) and Research Fund for the Doctoral Program of Higher Education of China (20130042110040).

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Authors and Affiliations

  1. State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang, 110819, Liaoning, China

    Jie Chen, Changsheng Li, Xin Jin & Liqing Chen

  2. Nanjing Iron and Steel Co., Ltd., Nanjing, 210035, Jiangsu, China

    Lei Fang

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  1. Jie Chen
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  2. Changsheng Li
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  3. Xin Jin
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Correspondence to Changsheng Li.

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Chen, J., Li, C., Jin, X. et al. Effect of Quenching Process on Microstructures and Mechanical Properties of Fe-0.9Mn-0.5Cr-2.4Ni-0.5Mo-C Steel. J. of Materi Eng and Perform 27, 1505–1513 (2018). https://doi.org/10.1007/s11665-018-3163-7

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  • DOI: https://doi.org/10.1007/s11665-018-3163-7

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