Failure Analysis of Rheocast Cylinder Head Covers of Hypereutectic Al–Si Alloys

被引：0

作者：

Jian Feng

机构：

[1] Centre of Materials Engineering,

[2] Heilbronn University,undefined

来源：

Journal of Failure Analysis and Prevention | 2021年 / 21卷

关键词：

Aluminum casting; Rheocasting; Fractography; Fatigue; Failure analysis; Shot peening; Engine;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The purpose of the present study is to determine the cause of failures of semisolid rheocast cylinder head covers of hypereutectic modified LM30 alloys. The covers, manufactured by rheocasting, a process that consists of the incorporation and homogeneous distribution of the reinforcements in semisolid metal (SSM) before die casting, were shot-peened after heat treatment to increase the fatigue resistance. However, these engine components failed during operation after a short service time. The major flaws were located by radiography. The microstructure was controlled by metallography. Significant interactions between shot peening and surface/subsurface contaminants were identified by surface morphology and fractography. The fatigue properties of hypereutectic alloys were investigated by a high-frequency vibrophore. It was identified that the failure was related to the cleanliness of SSM as well as the rheocasting process. Recommendations were given to prevent the recurrence of similar failures.

引用

页码：488 / 493

页数：5

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