高强度灰铸铁缸盖的研究与应用  

Application and research of high-strength gray cast iron for cylinder heads

作　　者：高博[1] 张涛 史国庆 严江波 

机构地区：[1]海军驻兴平地区军事代表室,陕西兴平713100 [2]陕西柴油机重工有限公司,陕西兴平713100

出　　处：《中国铸造装备与技术》2016年第1期33-35,共3页China Foundry Machinery & Technology

摘　　要：为了解决传统灰铸铁缸盖强度、硬度低,且白口组织倾向大的问题。本实验采用铜铬钼镍锡合金化以及高效复合孕育剂二次孕育处理的工艺对其显微组织进行控制来改善其强度和硬度。结果表明：在高碳当量3.90%~4.00%下,适量提高Si/C比,采用铜铬钼镍锡合金化工艺（0.50%~0.60%Cu、0.25%~0.30%Cr、0.30%~0.40%Mo、0.50%~0.60%Ni、0.01%~0.02%Sn）,可有效细化珠光体,增加珠光体含量,使基体强度增加,并且使缸面硬度≥HB 210;同时,高效复合孕育剂二次孕育处理可以减少基体的白口组织倾向性,使缸盖的强度和硬度进一步提高。In order to increase the strength and hardness and decrease the chilling tenfency of gray cast iron for cylinder heads.Effects of alloying by copper, chrome, molybdenum,nickel, tin and efficient inoculation process on its mechanical properties and microstructural were investigated.The results showed that under the high carbon equivalent ranges from 3.90% to 4.00%,increases the Si/C ratio moderately, alloying by copper, chrome, molybdenum,nickel and tin can effectively increasing pearlite content,improve the tensile strength and finally make the hardness of cylinder surface exceed HB 210.Meanwhile, efficient composite inoculant secondary inoculation process can decrease the chilling tendency and increase the strength and hardness of cylinder head further.

关 键 词：缸盖 灰铸铁 合金化处理 孕育处理 

分 类 号：TG251[金属学及工艺—铸造]