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Effect of Tempering Temperature on the Microstructure and Properties of Fe-2Cr-Mo-0.12C Pressure Vessel Steel

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Abstract

To obtain the high-temperature strength and toughness of the medium–high-temperature–pressure steel, the microstructure evolution and mechanical properties of Fe-2Cr-Mo-0.12C steel subjected to three different tempering temperatures after being normalized were investigated. The results show that the microstructure of the sample, tempered in the range 675-725 °C for 50 min, did not change dramatically, yet the martensite/austenite constituents decomposed, and the bainite lath merged together and transformed into polygonal ferrite. At the same time, the precipitate size increased with an increase in tempering temperature. With the increase in the tempering temperature from 675 to 725 °C, the impact absorbed energy of the Fe-2Cr-Mo-0.12C steel at −40 °C increased from 257 to 325 J, and the high-temperature yield strength decreased; however, the high-temperature ultimate tensile strength tempered at 700 °C was outstanding (422-571 MPa) at different tested temperatures. The variations of the properties were attributed to the decomposition of M/A constituents and the coarsening of the precipitates. Fe-2Cr-Mo-0.12C steel normalized at 930 °C and tempered at 700 °C was found to have the best combination of ductility and strength.

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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 and Automation, Northeastern University, Shenyang, 110819, China

    Qi-wen Wang, Chang-sheng Li, Jie Chen & Jian Zhang

  2. Technology Center, Ma’anshan Iron & Steel Co., Ltd, Ma’anshan, China

    Huan Peng

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  1. Qi-wen Wang
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  2. Chang-sheng Li
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Correspondence to Chang-sheng Li.

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Wang, Qw., Li, Cs., Peng, H. et al. Effect of Tempering Temperature on the Microstructure and Properties of Fe-2Cr-Mo-0.12C Pressure Vessel Steel. J. of Materi Eng and Perform 27, 1485–1493 (2018). https://doi.org/10.1007/s11665-017-2856-7

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  • DOI: https://doi.org/10.1007/s11665-017-2856-7

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