This paper analyses the root causes of screw shaft failure in screw compressors. The failure mechanism was studied by visual inspection, macro- and microfractography, chemical characterization, and mechanical property analysis. The results reveal that the main reason for the failure was multisource fatigue due to the lack of surface quenching at the fracture position of the shaft root. To prevent similar failures, better control of surface quenching is strongly recommended.

中文翻译：

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螺杆压缩机螺杆轴的故障分析

本文分析了螺杆压缩机螺杆轴故障的根本原因。通过目测，宏观和微观形貌，化学表征和力学性能分析研究了失效机理。结果表明，失效的主要原因是由于轴根断裂位置缺乏表面淬火而导致的多源疲劳。为了防止类似的故障，强烈建议更好地控制表面淬火。