Abstract
Generally, the high-temperature performance of martensitic heat-resistant steels is limited by the content of δ-ferrite and the degradation of precipitates. Herein, a 9Cr high-nitrogen heat-resistant martensitic steel (HNHMS9) with 0.3 wt.% N was designed and prepared due to the high stability of nitride precipitates. Furthermore, its microstructure evolution was investigated, correlated to heat treatments. HNHMS9 normalized at 1200 °C and tempered at 760 °C exhibited more δ-ferrite, while HNHMS9 normalized at 1050 °C and tempered at 760 °C contained less δ-ferrite and massive strip-like coarse nitrides. Interestingly, the former HNHMS9 exhibited higher ductility than, but similar strength to, the latter at elevated temperature, although δ-ferrite is typically regarded as a detrimental phase for the strength and impact toughness of heat-resistant steels. Thus, an efficient strategy proposed for heat treatment of HNHMS9 is that it is preferable to eliminate strip-like coarse nitrides by insulation at elevated temperature despite the increased δ-ferrite content.
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This work is supported by the National Natural Science Foundation of China (Grant No. 51771137).
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Kong, W., Liang, L., Chen, Y. et al. Microstructure Evolution and Strengthening of a New High-Nitrogen Heat-Resistant Martensitic Steel Regulated by Heat Treatment. JOM 73, 3149–3157 (2021). https://doi.org/10.1007/s11837-021-04887-5
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DOI: https://doi.org/10.1007/s11837-021-04887-5