Microstructure and Properties of Fe-Cr-C Hardfacing Alloys Reinforced with TiC-NbC

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• 作者：Hai-yun LIU ^{liuhy1133@163.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Zhi-liang SONG ; Qing CAO ; ^{caoqingher@163.com" class="auth_mail" title="E-mail the corresponding author} ; Shao-ping CHEN ; Qing-sen MENG
• 关键词：Fe-Cr-C hardfacing alloy ; flux-cored wire ; titanium diboride ; niobium ; wear resistance
• 刊名：Journal of Iron and Steel Research, International
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：23
• 期：3
• 页码：276-280
• 全文大小：403 K

文摘

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.