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第 35 卷第 4 期山东大学学报(工学版) 2005 年 8 月

Vol. 35 No. 4 JOURNAL OF SHANDONG UNIVERSITY ( ENGINEERING SCIENCE) Aug. 2005
文章编号:1672 3961(2005) 04 0010 04
柴油机球墨铸铁曲轴的早期断裂机制研究
陈鹭滨,徐英
(山东大学材料科学与工程学院, 山东济南 250061)
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摘要采用化学成分分析、金相检测、宏观与微观断口形貌分析等方法对柴油机球墨铸铁曲轴的早期断裂
2: , QT600 3
机制进行了分析研究. 结果表明,轴颈圆角处的表面氧化皮及显微裂纹是引起疲劳开裂的主要原因,淬火组织缺陷诱
发裂纹源的形成,对曲轴早期断裂也有一定的影响,断裂机制为解理与准解理断裂,具有典型的脆性断裂特征.
关键词:球墨铸铁;曲轴;断裂机制
中图分类号: TG121 文献标识码:A
Study on early fracture mechanisms of spheroidal graphite
cast iron crankshaft of diesel engine
CHEN Lu bin , XU Ying
(School of Materials Science and Engineering , Shandong University , Jinan 250061 , China)
Abstract : The early fracture mechanisms of QT600 3 spheroidal graphite cast iron crankshaft of diesel engine
were analyzed by the position analysis , metallographical examination , macroscopical and
microcosmic fracture morphology analysis , etc. The results show that the surface oxidated layer and
microcracks at the round corner of the neck of the crankshaft are the main reasons ,the formation of the crack
source induced by the quench microstructure defect has certain influence too on the early fracture mechanisms
of the crankshaft. The fracture mechanisms are cleavage fracture and quasi cleavage fracture , with typical
characteristics of brittle fracture.
Key words : spheroidal graphite cast iron