铬合金丝与灰铸铁原位反应的研究
Research on In-situ Reaction Between Cast Iron and Cr Alloy Wires
王 雯, 许云华, 张夏妮, 牛立斌
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作者单位：(西安建筑科技大学 机电工程学院 耐磨材料研究所, 陕西 西安 710055)
中文关键字：原位生成； 灰铸铁； Cr合金丝； 颗粒增强
英文关键字：in-situ synthesized; grey cast iron; Cr alloy wires; particle reinforced
中文摘要：利用铸渗复合原位反应技术，将微米级直径铬合金丝与灰铸铁进行铸渗复合，并保温进行原位反应，铬合金丝中铬原子与铸铁基体中的铁、碳原子原位反应制备颗粒增强铁基复合材料。对复合区进行显微组织观察和分析，显微硬度测量。结果表明，原位反应产物为不规则的(Cr，Fe)7C3颗粒，均匀分布在铬合金丝中心；沿晶界分布的(Cr，Fe)23C6作为原位反应过程中的中间产物出现；中心复合区域显微硬度最高值达到1452 HV0.05，复合区域的平均显微硬度为1175HV0.05，是基材的4倍左右。
英文摘要：Using the method of casting and heat treatment, grey cast iron and micron-size Cr alloy wires were compounded. The reinforcement phases were in-situ synthesized between Cr alloy wires and graphite phases as well as iron phases in grey cast iron by heat treatment. The microstructure and microhardness of compound region were observed and measured. The results show that the in-situ synthesized (Cr, Fe)7C3 particles are tiny irregular and distribute evenly in the center of Cr alloy wires, and intermediate product (Cr, Fe)23C6 distributes along the grain boundary. The maximal microhardness of the compound region is 1175HV0.05 and the average microhardness is 4 times more than iron matrix.