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Microstructure and properties of Fe-Cr-C hardfacing alloys reinforced with TiC-NbC

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Abstract

The hypereutectic Fe-Cr-C hardfacing alloys with different contents of TiB2 and Nb were prepared by self-shielded flux cored arc welding. The microstructure of a series of hypereutectic Fe-Cr-C hardfacing alloys added with various TiB2 and Nb contents was investigated by using optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). In addition, their Rockwell hardness, microhardness and resistance to abrasive wear were tested. The results showed that the microstructure of a series of hypereutectic Fe-Cr-C hardfacing alloys consisted mainly of martensite, austenite, primary M7C3 carbides and eutectic M7C3 carbides. With the addition of TiB2, a new hard-phase TiC was produced in the hardfacing alloys. And in the alloys added with TiB2 and Nb, a new hard composite phase TiC-NbC was formed. The microhardness of the matrix was improved by adding TiB2 and Nb, but the effect on the Rockwell hardness of Fe-Cr-C hardfacing alloys was insignificant. The addition of TiB2 and Nb can also decrease the size of the primary M7C3 carbides and make the primary M7C3 homogeneous. As a result, the reinforced matrix, the more homogeneous primary M7C3 carbides, and the new hard-phase TiC-NbC all improved the wear resistance of Fe-Cr-C hardfacing alloys.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Taiyuan University of Technology, 030024, Taiyuan, Shanxi, China

    Hai-yun Liu (Doctor, Associate Professor), Zhi-liang Song, Qing Cao (Master, Engineer), Shao-ping Chen & Qing-sen Meng

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  1. Hai-yun Liu
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  2. Zhi-liang Song
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  3. Qing Cao
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  4. Shao-ping Chen
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  5. Qing-sen Meng
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Correspondence to Qing Cao.

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Liu, Hy., Song, Zl., Cao, Q. et al. Microstructure and properties of Fe-Cr-C hardfacing alloys reinforced with TiC-NbC. J. Iron Steel Res. Int. 23, 276–280 (2016). https://doi.org/10.1016/S1006-706X(16)30045-0

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  • DOI: https://doi.org/10.1016/S1006-706X(16)30045-0

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