摘要
介绍了变质处理对高Cr铸铁铸态组织和性能影响的试验方法,试验结果表明：（1）随着钇基重RE变质剂加入量的增加,材料铸态下的力学性能呈现先增后减趋势;（2）变质剂加入量为0.6%时,铸态材料具有较为优异的综合力学性能,磨球的边缘与心部硬度差达到4.5 HRC,试样铸态平均硬度达到54.3 HRC,冲击韧度为4.8 J/cm^2,比未经变质的试样分别高出约6.26%和26.32%;（3）随着钇基重RE变质剂加入量的增加,碳化物类型由网状结构逐渐向断网状、孤立状转变,使碳化物对基体的割裂作用逐渐减小,材料冲击韧度增加,但变质剂超过一定量时,反而会恶化材料韧性。
The test method and effect of modification on the microstructure and properties of high-Cr cast iron was introduced.The results showed that：（1）With the addition of yttrium-based RE-modifier,the mechanical properties of the material under the as-cast state was increased at first and then decreased.（2）When the amount of modifier was 0.6%,the as-cast material had best comprehensive mechanical properties,the difference between the edge and the core was 4.5 HRC. The average hardness of the cast specimen was 54.3 HRC,the impact toughness was 4.8 J/cm^2,which was about 6.26% and 26.32% higher than that of the untreated specimen respectively.（3）With the increase of yttrium-based RE-modifier,the type of carbide gradually changed from the network structure to the reticular and isolated shape,so that the cleavage effect of the carbide to the matrix gradually decreased,the impact toughness of the material increased. But when it exceeded than a certain amount,the toughness of the material deteriorated.
出处
《现代铸铁》
CAS
2017年第5期52-54,共3页
Modern Cast Iron
关键词
高Cr铸铁
变质处理
金相组织
力学性能
high Cr cast iron
modification
microstructure
mechanical properties
