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Effect of Nitrogen on Stacking Fault Formation Probability and Mechanical Properties of Twinning-Induced Plasticity Steels

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Abstract

Twinning induced plasticity (TWIP) steels containing nitrogen as the interstitial alloying element were designed, and the effects of N and Al on stacking fault energy (SFE), microstructure, and mechanical properties were investigated by using X-ray diffraction and transmission electron microscopy to determine the stacking fault formation probability. In addition, the microstructure and mechanical properties have been characterized. The results indicate that both N and Al decrease the stacking fault formation probability due to the increase of the SFE. The probability of localized stacking fault determined by a new method using electron diffraction spot shift reveals that stress- or strain-induced martensitic transformations (γ fccε hcpα′ bcc) during deformation may consume a large number of stacking faults and give rise to a more marked decrease in the stacking fault formation probability of TWIP steels with lower SFE than of higher one(s). Based on their magnitude of SFEs, the temperature-dependent mechanical properties of four TWIP steels were analyzed.

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Acknowledgment

This work is financially supported by the National Natural Science Foundation of China (Grant No. 50571060).

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Correspondence to Y.H. Rong.

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Manuscript submitted March 5, 2007.

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Huang, B., Wang, X., Wang, L. et al. Effect of Nitrogen on Stacking Fault Formation Probability and Mechanical Properties of Twinning-Induced Plasticity Steels. Metall Mater Trans A 39, 717–724 (2008). https://doi.org/10.1007/s11661-007-9434-9

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  • DOI: https://doi.org/10.1007/s11661-007-9434-9

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