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材料工程  2014 

Fe-Cr-B-C堆焊合金的组织与耐磨性

DOI: 10.11868/j.issn.1001-4381.2014.09.010, PP. 57-62

Keywords: 堆焊合金,显微组织,,硼化物,磨粒磨损

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Abstract:

采用药芯焊丝气体保护堆焊方法制备Fe-Cr-B-C堆焊合金,利用金相、SEM、XRD等方法,分析了不同硼含量对堆焊合金组织及硼化物形貌的影响。结果表明Fe-12Cr-xB-0.1C合金的显微组织由铁素体+奥氏体+(Fe,Cr)2B+(Fe,Cr)23(B,C)6组成。当硼含量<3%(质量分数,下同)时,随着硼含量增加,硼化物形态逐渐由断续网状转变为网状;当硼含量≥3%时,随着硼含量增加,初生块状(Fe,Cr)2B数量逐渐增加,其尺寸和分布更均匀,硼化物主要呈块状、条状、鱼骨状、蜂窝状及菊花状分布。初晶(Fe,Cr)2B近似呈四边形柱状体,趋向垂直于堆焊层表面生长。当硼含量≤4%时,硼的增加能显著提高Fe-Cr-B-C堆焊合金的硬度及耐磨性。

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