合金元素对耐热球墨铸铁耐磨性能的影响  

Effect of Alloying Elements on Wear Resistance of Heat-Resistant Ductile Iron

作　　者：于思荣[1] 高乾[1] 朱先勇[2] 刘耀辉[1] 

机构地区：[1]吉林大学材料科学与工程学院,吉林长春130025 [2]吉林大学机械科学与工程学院,吉林长春130025

出　　处：《铸造》2010年第5期495-498,共4页Foundry

基　　金：吉林省科技发展计划项目资助(20070503)

摘　　要：研究了合金元素对耐热球墨铸铁耐磨性能的影响。结果表明,球墨铸铁的磨损失重随Mn、Mo、Cr含量的增加而下降。Mn、Cr的加入均可以提高材料的硬度,并且在共析转变过程中,促进珠光体转变,稳定和细化珠光体,提高球墨铸铁的耐磨性;Mo能提高球墨铸铁组织的稳定性,细化珠光体,从而提高球墨铸铁的耐磨性。适量加入Si(4.5%)可减少铸态组织中的碳化物,提高球墨铸铁的耐磨性,但Si含量过多(5.0%)则会减少珠光体数量,降低球墨铸铁的耐磨性。球墨铸铁磨损失重和摩擦系数均随载荷的增加而增加,但低耐磨性的球墨铸铁试样磨损失重和摩擦系数的增加幅度明显高于高耐磨性的球墨铸铁试样。The study was carried out to investigate the effect of alloying elements on wear resistance of heat-resistant ductile iron. The results show that the wear mass loss of ductile iron decreases with increasing Mn, Mo, and Cr content. Mn and Cr can enhance the hardness of materials, promote the pearlite transformation, stabilize and refine pearlite, and improve the wear resistance of ductile iron. Mo can increase the stability of the microstructure, refine pearlite, and thereby enhance the wear resistance of ductile iron. Si （4.5 wt.%） can reduce the carbide in as-cast structure and improve the wear resistance of ductile iron. But too much Si （5.0 wt.%） will reduce the number of pearlite and lower the wear resistance of ductile iron. The wear mass loss and friction coefficient of ductile cast iron increase with increasing load. But the rates of increase of the wear mass loss and friction coefficient of ductile cast iron specimens with low wear resistance were significantly higher than those of ductile cast iron specimens with high wear resistance.

关 键 词：耐热球铁 模具材料 耐磨性 

分 类 号：TG143.5[一般工业技术—材料科学与工程]