CADI磨球中Cr元素对其微观组织及力学性能的影响

Effect of Cr on Microstructure and Mechanical Properties of CADI Grinding Ball

针对含碳化物等温淬火球墨铸铁(CADI)磨球发生掉皮、破碎和耐磨性差等问题,通过对不同Cr元素含量下磨球的微观组织与性能进行分析,使CADI磨球的综合性能得到改善。结果表明,磨球组织由贝氏体、马氏体、碳化物、残余奥氏体和石墨球组成。随着Cr含量的增加,CADI磨球中碳化物的含量增加,使CADI磨球的硬度增大,但其韧性也急剧恶化。此外,Cr含量为0.82%时CADI磨球在加工硬化前的硬度达到54.2 HRC,冲击韧度值降低至5.0 J/cm^2。

In order to solve the problems of peel loss,breakage and wear resistance of the grinding ball containing carbide isothermal quenching nodular iron(CADI),the microstructure and properties of the grinding ball under different Cr element contents were analyzed,so that the comprehensive performance of the grinding ball containing CADI could be improved.The results show that the grinding ball is composed of bainite,martensite,carbide,residual austenite and graphite ball.With the increase of Cr content,the carbide content in CADI grinding ball increases,which increases the hardness of CADI grinding ball,but its toughness also deteriorates sharply.In addition,with Cr content of 0.82%,the hardness of CADI grinding ball before work hardening reach 54.2 HRC,and the impact toughness value decreased to 5.0 J/cm^2.