白口铸铁磨面辊齿等离子弧重熔组织和耐磨性  

Analysis of microstructure and wear resistance of the white cast iron roll tooth after plasma remelting

作　　者：王萌萌[1] 王国凡[1] 苗磊[1] 季燕菊[1] 任光利 

机构地区：[1]山东建筑大学材料科学与工程学院,山东济南250101 [2]山东利江粮油科技发展有限公司,山东聊城252800

出　　处：《焊接技术》2009年第10期9-12,共4页Welding Technology

基　　金：国家科技型中小企业技术创新基金(07c26213700600);山东省中青年科学科研奖励基金(2006BSO1447)

摘　　要：利用等离子弧重熔技术对离心铸造白口铸铁磨面辊齿面进行强化处理,借助光学显微镜和洛氏硬度计观察测试重熔层的组织结构及硬度,并对重熔前后试样表面的耐磨性进行了对比试验。试验结果表明:辊齿经等离子弧重熔组织由亚共晶白口转变为共晶和过共晶的混合组织,拉齿破坏的离心铸造的"流线的连续性"得到恢复,辊齿齿顶的硬度由原来HRC58～60提高到了HRC64～65,耐磨性是重熔前的2～3倍。The surface of the white cast iron roll tooth was processed using the plasma remelting technology. The microstructure and hardness of the roll tooth were tested by optical microscope and Rockwell hardness tester, and contrast test of wear resistance was studied. The results indicated that, after plasma remelting, the microstructure had transformed from hypoeutectic structure to mixed structure which was composed of eutectic and hypereutectic structure. Streamline continuity made by centrifugal casting which was destroyed during gear broaching was restored. The hardness of the tooth top was increased from HRC58～HRC60 to HRC64～HRC65, and the wear resistance was 2～3 times than before.

关 键 词：白口铸铁 磨面辊 离心铸造 等离子弧 重熔 耐磨性 

分 类 号：TG252[金属学及工艺—铸造] TG456.2