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Effect of Mn addition and Its Nitridation on Microstructure and Properties of Sintered Fe-1Mn-0.5C Low-Alloy Steel

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Abstract

In the presence of N2 atmosphere, electrolytic Mn powders were modified by nitridation at 600 °C for 3h, after which Mn4N, FeN0.088 and MnO phases were observed. After exposing the powders to the air for 50 days, we have demonstrated an excellent anti-oxidation ability of the nitridized powders owing to a very low O increment rate (~1.93%). In contrast, a small amount of Mn2N0.86 and Mn2O3 phases were presented once electrolytic Mn powders were handled with 75% N2 + 25%H2 atmosphere at 600 °C for 3h. In considering the fact that both N and O contents are higher on powder surfaces than those in the interior, a shell-core structure composed of a surface layer of nitride/oxide, and an oxide-free core of Mn, was developed for two groups of nitridized powders. Moreover, compared to Fe-1Mn-0.5C alloy sintered from the original electrolytic Mn powders, inferior level of O (as low as ~0.056%) was detected in the alloy sintered from the nitridized powders. Correspondingly, the latter exhibited a ductile fracture mode and improved mechanical properties of ultimate tensile strength ~496 MPa, and elongation to failure ~5%.

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Acknowledgment

This work was supported by the National High Technology Research and Development Program of China (863 Program) under the Grant No. 2013AA031102. One of the authors (PL) gratefully acknowledges the financial support from Shanghai Collaborative Innovation Center for Heavy Casting/Forging Manufacturing Technology.

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People’s Republic of China

    Huizhu Chen, Yingjie Yang, Anping Long & Songlin Li

  2. Institute of Materials for Clean Energy Manufacturing and Shanghai Collaborative Innovation Center for Heavy Casting/Forging Manufacturing Technology, School of Mechanical Engineering, Shanghai Dianji University, Shanghai, 201306, People’s Republic of China

    Peng Luo

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  1. Huizhu Chen
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Correspondence to Songlin Li.

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Chen, H., Luo, P., Yang, Y. et al. Effect of Mn addition and Its Nitridation on Microstructure and Properties of Sintered Fe-1Mn-0.5C Low-Alloy Steel. J. of Materi Eng and Perform 26, 4481–4490 (2017). https://doi.org/10.1007/s11665-017-2677-8

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  • DOI: https://doi.org/10.1007/s11665-017-2677-8

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