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Correlations of Ni Contents, Formation of Reversed Austenite and Toughness for Ni-Containing Cryogenic Steels

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

It has been widely demonstrated that addition of Ni in low-carbon steels can effectively improve the cryogenic toughness, but the mechanism behind it has yet to be clarified. In the present work, the evolutions of microstructure and mechanical properties after quenching and tempering for Ni-containing cryogenic steels with different Ni contents (3.5–9 wt%) were investigated. The results showed that after quenching and tempering, the Ni-containing cryogenic steels were composed of tempered martensite and reversed austenite. The volume fraction of reversed austenite has increased from 0 up to 6.3% when the Ni content increases from 3.5% to 9%. The Charpy impact tests indicated that the low-temperature toughness was markedly improved with the increase in Ni content, which can be correlated with the increase in reversed austenite amount. The main contribution of reversed austenite to the toughness lies in: (1) the elimination of cementite precipitates improved the plastic deformation capacity of matrix, and (2) the crack propagation is hindered through plastic deformation.

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Acknowledgments

This work is supported by the Fundamental Research Funds for the Central Universities (No. N120807001) and the National High-tech Research and Development Program of China (863 Program) (No. 2007 AA03Z504).

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Correspondence to Meng Wang or Zhen-Yu Liu.

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Available online at http://link.springer.com/journal/40195

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Wang, M., Liu, ZY. & Li, CG. Correlations of Ni Contents, Formation of Reversed Austenite and Toughness for Ni-Containing Cryogenic Steels. Acta Metall. Sin. (Engl. Lett.) 30, 238–249 (2017). https://doi.org/10.1007/s40195-016-0496-9

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  • DOI: https://doi.org/10.1007/s40195-016-0496-9

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