锻造中铬合金白口铸铁组织和性能研究  

Study on microstructure and properties of forged medium-chrome alloy white cast iron

作　　者：林飞[1] 孟庆森[1] 

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《材料科学与工艺》2006年第5期463-465,469,共4页Materials Science and Technology

基　　金：山西省青年科技研究基金资助项目(20001020)

摘　　要：利用锻造方法并结合锻后适当的热处理工艺可大幅度提高铬合金白口铸铁的冲击韧性．采用热望性镦粗试验方法，对不同碳含量中铬合金白口铸铁的热塑性、碳对中铬白口铸铁热塑性的影响规律进行了研究，分析了不同热处理工艺对其锻后组织和性能的影响，并提出了可明显提高锻造中铬合金白口铸铁抗冲击磨损性能的热处理工艺参数．研究表明：含碳量为1.85％-2．59％的中铬合金自口铸铁在850-1130℃的温度范围内，具有良好的塑性变形能力，且随碳含量的增加，中铬白口铸铁的热塑性下降，其主要原因是碳含量不同所引起的组织中共晶碳化物的数量的改变所致．Adopting forging method and proper heat treatment after forging can improve significantly the impact toughness of chromium alloy white cast iron. Making use of hot plasticity upsetting test method, the hot plasticity of medium-chrome alloy white cast iron with different carbon content, and the influence of carbon on the hot plasticity of medium-chrome one were studied. The effect of different heat treatment processes on its forged microstructure and properties was also studied. The results show that medium-chrome alloy white cast iron with 1.85% -2.59% carbon content has, in 850 - 1130 ℃ ranges, good forgeability, and its hot plasticity becomes bad up to the increase of carbon content. The main reason is that the difference of carbon content causes the change of the quantity of eutectic carbide in organization. On the basis of them, the heat-treating technology which can improve significantly the impact abrasive resistance of forging medium-chrome alloy white cast iron were put forward.

关 键 词：中铬白口铸铁 锻造 热处理 机械性能 

分 类 号：TG143.1[一般工业技术—材料科学与工程] TG31[金属学及工艺—金属材料]