理化检验-物理分册2025，Vol.61Issue(12)：52-56,5.DOI:10.11973/lhjy-wl250173
排气阀杆密封面开裂原因
Cracking reason of exhaust valve steam seal surface
ZHOU Jun 1SUN Mingzheng 2PAN Yujun1
作者信息
- 1. Hudong Heavy Machinery Co.,Ltd.,Shanghai 200129,China
- 2. Shanghai Research Institute of Materials Co.,Ltd.,Shanghai 200437,China
- 折叠
摘要
Abstract
The sealing surface of exhaust valve stem of a diesel engine cracked.The causes of valve stem cracking were analyzed by means of macroscopic observation,chemical composition analysis,mechanical property test,scanning electron microscope and energy spectrum analysis,metallographic examination.The results show that there were hard particles in the service environment of the valve stem.In the process of the valve stem sealing surface sticking to the base,the hard particles caused damage to the sealing surface and formed micro cracks.Under the action of alternating stress,the cracks continued to expand,eventually led to fatigue cracking of the valve stem.关键词
排气阀杆/密封面/疲劳开裂/硬质颗粒/力学性能Key words
exhaust valve stem/sealing surface/fatigue cracking/hard particle/mechanical property分类
通用工业技术引用本文复制引用
ZHOU Jun,SUN Mingzheng,PAN Yujun..排气阀杆密封面开裂原因[J].理化检验-物理分册,2025,61(12):52-56,5.
