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汽车方向盘骨架断裂原因分析

Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2018-01-08

Journal: 理化检验-物理分册

Volume: 54

Issue: 1

Page Number: 46-49,77

ISSN: 1001-4012

Key Words: 方向盘骨架;断裂;晶粒尺寸;缺陷;裂纹

Abstract: 某些镁合金方向盘骨架在车辆试验过程中发生断裂,通过宏观观察、扫描电镜及能谱分析、金相检验等方法,分析了方向盘的断口形貌及组织特征,以确定方向盘断裂的原因.结果表明:断裂方向盘经历了微裂纹形成与扩展和快速断裂两个阶段;断裂方向盘组织中晶粒尺寸不均匀,存在大枝晶和缺陷,而未断裂方向盘组织中的晶粒相对细小致密,这些是方向盘骨架断裂的主要原因.

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