齿轮轴开裂原因分析

齿轮轴放置一段时间后发生开裂。通过宏微观观察、金相组织检查、硬度测试、能谱成分分析以及氢含量测定，对齿轮轴的开裂性质和原因进行分析。结果表明:齿轮轴开裂性质为氢致延迟脆性开裂；齿轮轴开裂与氢含量关系较小；齿轮轴内部存在较大的Al₂O₃?(CaO)_X夹杂缺陷，导致较大的应力集中，这是齿轮轴发生氢致脆性开裂的主要原因。应严格控制齿轮轴原材料的质量，防止类似故障的发生。

Cracking Cause Analysis of Gear Shaft

A gear shaft cracked after stored for a while. In order to determine its failure mode and cause, macro and micro observation, microstructure examination, hardness testing, energy dispersive X-ray spectroscopy analysis and hydrogen content testing were carried out. The results indicate that the failure mode of the gear shaft is delayed brittle cracking induced by hydrogen embrittlement. The hydrogen content has little effect on the cracking of the gear shaft There is a large Al₂O₃?(CaO)_X inclusion defect at the source zone, resulting in greater stress concentration, which is the main cause for the brittle cracking. It is suggested that the quality of the material should be seriously controlled so that such failure can be prevented.