Sn对蠕墨铸铁组织与抗热疲劳性能的影响  

Influence of Sn on the Microstructures and Thermal Fatigue Resistance of Vermicular Graphite Cast Iron

作　　者：陈海军[1,2] 陈丹[1] 吴素珍[1] 桑玮玮[1] 李建 

机构地区：[1]河南工程学院机械工程学院,河南郑州451191 [2]驻马店中集华骏铸造有限公司,河南驻马店463000

出　　处：《铸造》2015年第1期5-8,共4页Foundry

基　　金：河南工程学院博士基金(0485/D2012010)

摘　　要：研究了Sn含量对汽车制动鼓用蠕墨铸铁中蠕墨数量、形态、基体组织以及抗热疲劳性能的影响规律。结果表明，Sn可以明显改变蠕铁中的珠光体含量，对蠕化率无明显影响，可以改变蠕铁热疲劳性能。Sn含量为0．06％（质量分数，下同）时，珠光体含量最高为95％，片层间距为0．07μm。Sn含量增加时，石墨轴比率逐渐上升，石墨变得细长且分叉增多。在20～600℃循环条件下，含0．06％Sn时蠕铁的热疲劳裂纹长度最短，抗热疲劳性能最好。The influence of Sn on the graphite quantity, graphite morphology, matrix structure and thermal fatigue resistance of the vermicular graphite cast iron used for automobile brake drum was investigated. The results show that Sn can change the pearlite content and thermal fatigue resistance, the effect ofvermicular rate is not evidenct. The cast iron with 0.06%（mass fraction, similarly hereinafter） Sn has the highest pearlite content 95%, interlayer spacing 0.07 μm. The axial ratio and forking of graphite rise and graphite becomes slight when Sn content increases. The thermal fatigue resistance of compacted graphite iron with 0.06% Sn is the best under 20-650 ℃ of thermal cycles condition.

关 键 词：蠕墨铸铁 SN 热疲劳 

分 类 号：TG143[一般工业技术—材料科学与工程]