金属热处理 ›› 2021, Vol. 46 ›› Issue (7): 242-248.DOI: 10.13251/j.issn.0254-6051.2021.07.047

• 测试与分析 • 上一篇    下一篇

高调阀自密封拉紧螺栓断裂分析

谢增孝1, 黄一君2,3, 张宇飞1, 楼玉民2,3, 蒲贤超1   

  1. 1.浙江浙能中煤舟山煤电有限责任公司, 浙江 舟山 316131;
    2.浙江浙能技术研究院有限公司, 浙江 杭州 311121;
    3.浙江省火力发电高效节能与污染物控制技术研究重点实验室, 浙江 杭州 311121
  • 收稿日期:2021-01-23 出版日期:2021-07-25 发布日期:2021-12-10
  • 作者简介:谢增孝(1971—),男,工程师,学士,主要研究方向为火力发电厂设备管理,E-mail: 690261113@qq.com。

Fracture analysis of self sealing tension bolt of high pressure regulating valve

Xie Zengxiao1, Huang Yijun2,3, Zhang Yufei1, Lou Yumin2,3, Pu Xianchao1   

  1. 1. Zhejiang Zheneng Zhongmei Zhoushan Coal & Electricity Co., Ltd., Zhoushan Zhejiang 316131, China;
    2. Zhejiang Zheneng Technology Research Institute Co., Ltd., Hangzhou Zhejiang 311121, China;
    3. Zhejiang Provincial Key Laboratory of Energy Conservation & Pollutant Control Technology for Thermal Power, Hangzhou Zhejiang 311121, China
  • Received:2021-01-23 Online:2021-07-25 Published:2021-12-10

摘要: 通过宏观和微观形貌观察、化学成分分析、力学性能检测、显微组织观察等方法,对两根高调阀自密封拉紧螺栓的断裂原因进行分析。结果表明,螺栓的材料牌号确定为1Cr11Co3W3NiMoVNbNB钢,其中编号为91的螺栓的塑性和韧性皆已不满足要求,且组织中存在有害的Laves相容易发生冲击断裂。编号为91的螺栓第2~3螺纹牙底存在高温时的原始裂纹,编号为92的螺栓第3~4螺纹牙底存在高温时的坑状裂纹源,两根螺栓均是在常温时因冲击载荷的作用导致迅速断裂。

关键词: 1Cr11Co3W3NiMoVNbNB钢, 螺栓, 断裂, 冲击载荷

Abstract: Fracture causes of two self sealing tension bolts of high pressure regulating valve were analyzed by means of macroscopic and microscopic observation, chemical composition analysis, mechanical property tests, and microstructure observation. The results show that the material of the two bolts is 1Cr11Co3W3NiMoVNbNB steel. The plasticity and toughness of one hurt bolt (No.91 in the text) can not meet the requirements. There is harmful Laves phase observed in the structure, which is prone to fracture by impact. There is an original crack at the root of second to third screw of the bolt ,and a pit like crack source at the root of the third to fourth screw of the another hurt bolt, which may initiate during service at high temperature. Both bolts are broken rapidly due to impact load while disassembled at room temperature.

Key words: 1Cr11Co3W3NiMoVNbNB steel, bolt, fracture, impact load

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