含TiB2相Fe-Cr-Ti-B堆焊合金的显微组织及耐磨性
Microstructure and Wear-resistance of Fe-Cr-Ti-B Hardfacing Alloys
龚建勋,李煌,肖逸锋,张清辉
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作者单位：湘潭大学机械工程学院
中文关键字：药芯焊丝；堆焊；硼化物；显微组织；耐磨性
英文关键字：flux-cored wire； hardfacing； boride； microstructure； wear resistance
中文摘要：采用药芯焊丝埋弧堆焊方法制备含 0.8%～1.2%C，7%～8%Cr，0.8%～1.0%Ti，0～1.2%B(质量分数)的Fe-Cr-Ti-B堆焊合金，借助光学显微镜、X射线衍射等分析手段，研究其显微组织及相组成，结果表明，该堆焊合金的基体组织由大量铁素体＋少量马氏体组成，而硬质相则由(Fe,Cr)3(C,B)+TiB2+TiC+ (Fe,Cr)2B+(Fe,Cr)B等构成。另外，考察了碳化硼(B4C)含量对Fe-Cr-Ti-B堆焊合金硬度和耐磨性的影响，试验结果表明，含TiB2相的Fe-Cr-Ti-B堆焊合金具有优良的耐磨性；随药芯焊丝中B4C含量的增加，堆焊合金硬度及相对耐磨性先升高后降低，当其质量分数为5%时，达到最佳值。
英文摘要：Fe-Cr-Ti-B hardfacing alloys containing 0.8%～1.2%C, 7%～8%Cr, 0.8%～1.0%Ti, 0～1.2%B (mass fraction) were deposited by the method of flux-cored wire submerged arc welding. The microstructure was investigated by OP and XRD. The microstructure consists of a large number of ferrite, a small amount martensite and borides or carbides such as (Fe, Cr)3(C,B), TiB2, TiC, (Fe, Cr)2B, (Fe, Cr)B etc. The effects of B4C in flux-core wire on hardness and wear-resistance were evaluated. The results show that wear resistance of Fe-Cr-Ti-B hardfacing alloys containing TiB2 phases is excellent. With the addition of B4C in flux-core wire, the hardness and relative wear resistance firstly increases, and then reduces. The optimum effect is acquired when B4C content is 5%