Analysis on Fracture Reason of Pneumatic Actuator Bolt in Steam Trap Valve of High Pressure Heating System
摘 要
某核电厂大修期间, 发现高压加热系统中疏水阀气动头与阀门本体连接的6颗内六角沉头螺栓中有5颗发生了断裂。通过分析断裂螺栓材料、力学性能、显微组织和断口等, 并结合阀门实际运行信息, 认为疏水阀气缸中的工作压力超过公称压力致使螺栓长期处于高的拉-拉型交变应力状态, 从而引起螺栓的疲劳断裂。同时提出了防止该类螺栓在其使用过程中发生类似断裂事故的建议。
Abstract
In the process of shutdown maintenance of a nuclear power unit, it was found that five of six pneumatic actuator bolts in steam trap valve of high pressure heating system had been breakdown. A comprehensive analysis which was based on chemical composition analysis, mechanical properties testing, metallographic examination and microstructure observation, as well as actual operating information, was made on the breakdown of the pneumatic actuator bolts. The results showed that working pressure exceeding nominal pressure in value cylinder induced that the bolts were in long-term tension-tension alternating stresses state, causing the bolts fatigue rupture. In the meanwhile, several measures for the failure control were proposed.
中图分类号 TG142.1+2
所属栏目 质量控制与失效分析
基金项目
收稿日期 2013/7/18
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备注边春华(1982-), 男, 工程师, 学士。
引用该论文: BIAN Chun-hua,FANG Ke-wei,ZHANG Wei,MIAO Xue-liang. Analysis on Fracture Reason of Pneumatic Actuator Bolt in Steam Trap Valve of High Pressure Heating System[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2013, 49(11): 773~776
边春华,方可伟,张维,苗学良. 高加抽汽管疏水阀气动执行机构螺栓断裂原因分析[J]. 理化检验-物理分册, 2013, 49(11): 773~776
被引情况:
【1】温爱玲,路文娟,王生武, "35CrMo螺栓断裂分析",理化检验-物理分册 50, 674-676(2014)
【2】姚兵印,张志博,马剑民,王玉兴,卢正欣, "风力发电机组叶片连接高强螺栓的断裂原因分析",理化检验-物理分册 52, 339-344(2016)
【3】张雪庭, "某压缩机内部活塞与滑阀连接螺栓断裂失效分析",理化检验-物理分册 51, 290-292(2015)
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