联轴器螺栓断裂原因分析与改进

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Analysis and Improvement on Broken Coupling Bolts

China Nuclear Power Engineering Company, Ltd. ShenZhen, Guangdong, 518120, China

摘要: 从化学成分、断口形貌等方面对联轴器螺栓断裂原因进行分析,问题批次螺栓失效形式属于氢脆断裂,是螺栓强度高、硬度高、钢中存在残留的氢等因素综合作用的结果。通过改进螺栓型式、表面处理工艺优化、降低螺栓抗拉强度等措施控制螺栓质量。改进后的双头螺柱满足低压安全注入系统(RIS)安注泵、安全壳喷淋系统(EAS)安全壳喷淋泵的安全运行要求。
- 核电厂 /
- 氢脆 /
- 高强度螺栓 /
- 应力集中 /
- 断裂
Abstract: An extensive investigation on chemical element, fracture surface and so on was conducted into these broken bolts. The investigation showed that the broken bolts resulted from hydrogen-brittleness, high-hardness, high-strength and residual hydrogen. In order to improve the quality of bolts, the supplier changed the design model, improved the surface treatment method, and decreased the strength of bolts. The bolts after 2ndimprovement satisfied the requirements for safety operation.
- Nuclear power station /
- Hydrogen-brittleness /
- High-strength bolt /
- Stress concentration /
- Broken