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Phase Evolution in Boride-Based Cermets and Reaction Bonding onto Plain Low Carbon Steel Substrate

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Abstract

Reaction sinter bonding is a process that aims to bond two materials for improvement in properties through reactive sintering technique. The process has been effectively used to sinter hard materials like borides in situ which not only possess excellent oxidation resistance, good corrosion resistance but also resistant to abrasive wear. Sinter bonding is a unique surface modification process achieved through powder metallurgy and is competent with other techniques like boronizing sintering and sinter-brazing since it eliminates the additional operations of heat treatment and assembly and removes the inherent setbacks with these processes. This study focuses on identifying the phase evolution mechanism using characterization tools like x-ray diffractometry and energy dispersive spectroscopy and study of sinter bonding of the boron containing precursors (Mo-Cr-Fe-Ni-FeB-MoB) onto plain carbon steel. A microstructure containing Fe-based matrix dispersed with complex borides develops with temperature in the tape cast sheets. A fivefold increase in hardness between plain carbon steel in wrought condition and sinter bonded steel was observed. The multilayer consisted of a reaction zone adjacent to the interface and was investigated with the composition profile and hardness measurements. A model of sinter bonding between the cermet and the steel has also been proposed.

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Acknowledgments

The authors are grateful to Prof. Ken-Ichi Takagi (Musashi Institute of Technology, Tokyo) and Dr. Hirofumi Tashiro (Toyo Kohan Co. Ltd., Japan) for their technical feedback and assistance. The assistance provided by Mr Ankit Jain, undergraduate student, IIT Kanpur with the experiments is also gratefully acknowledged.

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Authors and Affiliations

  1. Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur, 208016, UP, India

    B. Palanisamy & A. Upadhyaya

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  1. B. Palanisamy
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  2. A. Upadhyaya
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Correspondence to B. Palanisamy.

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Palanisamy, B., Upadhyaya, A. Phase Evolution in Boride-Based Cermets and Reaction Bonding onto Plain Low Carbon Steel Substrate. J. of Materi Eng and Perform 21, 508–515 (2012). https://doi.org/10.1007/s11665-011-9938-8

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  • DOI: https://doi.org/10.1007/s11665-011-9938-8

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