合金元素对球墨铸铁抗热疲劳性能的影响  

Effect of Alloying Elements on Thermal Fatigue Properties of Ductile Iron

作　　者：于思荣[1] 朱先勇[2] 高乾[1] 刘耀辉[1] 

机构地区：[1]中国石油大学(华东)机电工程学院,山东东营257061 [2]吉林大学材料科学与工程学院,吉林长春130025

出　　处：《铸造技术》2010年第6期691-694,共4页Foundry Technology

基　　金：吉林省科技发展计划项目资助(20070503)

摘　　要：研究了合金元素对球墨铸铁抗热疲劳性能的影响。结果表明,就抗热疲劳性能而言,在本研究范围内,耐热球墨铸铁模具材料的较佳成分配比w为:5.0%Si、0.5%Mn0、.5%Mo、1.2%Cr。Si是影响材料热疲劳抗力的重要元素,对耐热球墨铸铁模具材料的抗热疲劳性能起着决定性作用,它的含量直接决定了耐热球墨铸铁模具材料热疲劳抗力的总体水平。Mo元素的加入能够使晶粒细化,其含量越多,则晶粒越细小,材料对热疲劳裂纹萌生和扩展的抗力就越强。The effect of alloying elements on thermal fatigue property of ductile iron was studied in this paper. The results showed that for the thermal fatigue properties, the better chemical composition of the heat-resistant ductile cast iron mold material within the scope of this study was Si 5.0 （wt.）%, Mn 0.5 （wt.）%, Mo 0.5（wt.）%, and Cr 1.2 （wt.）%. Si is an important element that affects the thermal fatigue resistance of materials, it plays a decisive role in the thermal fatigue resistance of the heat-resistant ductile cast iron mold material, and its content directly determines the overall level of the thermal fatigue resistance of ductile cast iron mold materials. Mo element added can make grain refine. The more Mo content is, the finer the grain, and the stronger the resistance to the thermal fatigue crack initiation and extension.

关 键 词：球墨铸铁 模具材料 耐热性 热疲劳 

分 类 号：TG255[金属学及工艺—铸造]