w(Cu)对灰铸铁气缸体组织和性能的影响

Influence of Cu Content on Microstructure and Mechanical Properties of Gray Iron Cylinder Block

通过对灰铸铁进行合金化处理,研究了w（Cu）量对WP12气缸体金相组织和力学性能的影响。结果表明：（1）随着w（Cu）量的增加,灰铸铁的抗拉强度和硬度均有一定幅度的提高,当w（Cu）量达到0.60%~0.80%时,其抗拉强度为235MPa,硬度为195 HB;w（Cu）量达到0.8%以上,抗拉强度的提升已不明显。（2）不同w（Cu）量的灰铸铁,其石墨形态均为A型,珠光体体积分数可达98%以上;在w（Cu）量低于0.8%时,随着w（Cu）量的增加,Cu细化珠光体的作用明显增大,当w（Cu）量大于0.8%以后,Cu细化珠光体的作用不再增大。

By alloying-treating gray cast iron,the influence of Cu content on microstructure and mechanical properties of WP12 series cylinder block was investigated. The result showed：（1）With increase of their Cu content,both the tensile strength and hardness of gray irons increased in some extent. When the Cu content reached 0.6%~0.8%,the tensile strength was of 235 MPa,hardness was of 195 HB. When Cu content reached 0.8% and higher,the tensile strength increase of gray iron was obvious no more.（2）The graphite morphology of all gray irons having different Cu contents was A type,their pearlite volume fraction could reach 98% and higher;when Cu content was less than 0.8%,the pearlite fining effect of Cu increased obviously with increase of Cu content,and after the Cu content was higher than 0.8%,the pearlite fining effect of Cu increased no more.