风冷气缸套螺栓孔断裂原因分析  

Analysis on Cause for Fracturing of Bolt Hole of Air-cooled Cylinder Liner

作　　者：焦丽[1] 王国亮[1] 马雁军 葛保红 徐向阳[1] JIAO Li;WANG Guoliang;MA Yanjun;GE Baohong;XU Xiangyang(Hebei Huabei Diesel Engine Co.,Ltd.,Shijiazhuang 050081,Hebei China;Shanxi Diesel Engine Industry Co.,Ltd.,Datong 037036,Shanxi China)

机构地区：[1]河北华北柴油机有限责任公司,河北石家庄050081 [2]山西柴油机工业有限责任公司,山西大同037036

出　　处：《热处理》2023年第3期48-50,共3页Heat Treatment

摘　　要：风冷气缸套散热片在加工螺栓孔的过程中断裂。通过宏观检验、化学成分分析和金相检验等分析了螺栓孔断裂的原因。结果表明:螺栓孔机加工区有大量过冷石墨和游离渗碳体,脆性很大,从而导致其机加工时断裂。The fins of air-cooled cylinder liner fractured in the process of machining bolt hole.The cause for bolt hole fracturing was analyzed by means of macroscopic examination,chemical compositions analysis and metallographic test.The results showed that there were a large number of supercooled graphite and free cementite in machining area of bolt hole which were very brittle,thus resulting in its fracturing during machining.

关 键 词：气缸套 游离渗碳体 过冷石墨 

分 类 号：TG157[金属学及工艺—热处理]