变质处理对耐磨耐蚀铸铁组织及性能的影响

 为了提高材料在水泥混凝土搅拌和输送工况下的使用性能，以新研制的耐磨耐蚀铸铁为对象，采用复合变质处理的方法研究了变质剂加入量对该试验合金铸铁组织、力学性能和耐腐蚀磨损性能的影响。研究结果表明，复合变质处理可以细化耐磨耐蚀铸铁基体组织、消除柱状枝晶，改善碳化物形态、尺寸及分布，使碳化物由变质前的粗大棒条状变为均匀分布的短棒状和颗粒状，消除了粗大片状碳化物对材料基体的危害，使耐磨耐蚀铸铁的性能得到改善。变质剂加入量增加，耐磨耐蚀铸铁的冲击韧度和耐磨耐蚀性能均有较大提高。与变质前相比，加入0.25%和0.50%复合变质剂处理的试验合金铸铁，其冲击韧度和相对耐腐蚀磨损性能分别提高了22.9%、58.3%和16%、23%，基体硬度略有降低，达到了预期效果。

Effect of modification treatment on microstructure and properties #br# of wear and corrosion resistant cast iron

 For improving service properties of the materials in the condition of cement concrete stirring and conveying，a newly developed wear and corrosion resistant cast iron were taken as the research object. Effect of addition amount of the complex modifier on microstructure，mechanical properties and corrosive wear property of the wear and corrosion resistant cast iron were investigated by complex metamorphic treatment. The experimental results show that the compound modification can refine the matrix microstructure，eliminate columnar dendrite grain in the matrix microstructure，change the carbide morphology，size and distribution，diminish the harm of coarse flake carbide on the wear and corrosion resistant cast iron matrix，and which increase mechanical properties and corrosive wear resistance. The addition of more complex modifier can significantly enhance the toughness and corrosive wear resistance. Compared with the unmodified wear and corrosion resistant cast iron，impact toughness and corrosive wear resistance of the wear and corrosion resistant cast iron modified by 0.25% and 0.50% complex modifier are increased by 22.9%，58.3% and 16%，23% respectively，and hardness have a little change，which has achieved the expected goal.