柴油机气缸盖开裂分析  

Cracking Analysis of Diesel Cylinder Head

作　　者：刁占英[1] 侯岳[1] 

机构地区：[1]中国北方发动机研究所,大同037036

出　　处：《理化检验（物理分册）》2009年第5期312-314,317,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：采用宏观和微观分析、化学成分分析、力学性能测试、金相检验和断口分析等方法对失效气缸盖进行了分析。结果表明,该失效件为疲劳开裂。材料组织不均匀、严重的组织疏松、热处理过程中出现的过烧现象使材料疲劳强度大幅度降低,导致其疲劳失效。The cracked cylinder head was studied by macro and micro-analysis, chemical compositions, mechanical properties, metallographic analysis and fracture analysis, which showed that the fracture mode was fatigue cracking. Because of the non-uniformity microstructure, severity microstructure porosity, and the overfiring phenomenon at the heat treatment, the fatigue strength was greatly decreased, which led to the failure.

关 键 词：气缸盖 疲劳开裂 疏松 过烧 

分 类 号：TK423.2[动力工程及工程热物理—动力机械及工程]