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Metals 2017, 7(3), 102; doi:10.3390/met7030102

Effects of Gas Nitriding Temperature on the Surface Properties of a High Manganese TWIP Steel

1
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
2
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Academic Editor: Rebecca L. Higginson
Received: 18 February 2017 / Revised: 9 March 2017 / Accepted: 17 March 2017 / Published: 21 March 2017
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Abstract

The effects of gas nitriding temperature on the cross section morphology, element nitrogen distribution, and surface layer compositions of a cold rolled and pre-strained high manganese austenitic TWIP steel 25Mn-3Cr-3Al-0.3C-0.01N and the corresponding anti-corrosion ability have been studied. The results show that, depending on nitriding temperature, the distribution of element nitrogen and main phase compositions are significantly different in the nitriding layers. At a temperature lower than 500 °C, the main composition in the modified layer is S-phase and the nitrogen concentration linearly decreases from the surface to the center, while Fe4N forms with S-phase and a step-like distribution of nitrogen content is present at nitriding temperature of 600 °C. Caused by the increasing of modified layer thickness and the formation of S-phase and Fe4N, the surface hardness was obviously enhanced. Anodic polarization curves in 3.5 wt. % NaCl solution indicate that the nitrided processes have a tremendous modification effect on anti-corrosion ability. Moreover, the increase of (111) oriented grain, caused by the elevated nitriding temperature, has a positive effect on the corrosion resistance. View Full-Text
Keywords: twinning-induced plasticity (TWIP) steel; gas nitriding; polarization curve; anti-corrosion ability twinning-induced plasticity (TWIP) steel; gas nitriding; polarization curve; anti-corrosion ability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yuan, X.; Zhao, Y.; Li, X.; Chen, L. Effects of Gas Nitriding Temperature on the Surface Properties of a High Manganese TWIP Steel. Metals 2017, 7, 102.

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