Failure characteristics analysis for fretting wear fatigue fracture of feed pump turbine blades

XIAO Zhongtu; SHI Zhigang; LI Chunguang; LI Liang; LI Changxu; GU Weiwei; ZHANG Baozhu

doi:10.19666/j.rlfd.202010263

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Failure characteristics analysis for fretting wear fatigue fracture of feed pump turbine blades

更新时间：2025-09-28

- Failure characteristics analysis for fretting wear fatigue fracture of feed pump turbine blades
- Thermal Power Generation Vol. 50, Issue 6, Pages: 157-162(2021)
- 作者机构：
  
  1. 神华国华宁东发电有限责任公司
  2. 西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202010263
  CLC： TM621
- Published：2021
- 稿件说明：
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XIAO Zhongtu, SHI Zhigang, LI Chunguang, et al. Failure characteristics analysis for fretting wear fatigue fracture of feed pump turbine blades[J]. Thermal power generation, 2021, 50(6): 157-162.
DOI：

XIAO Zhongtu, SHI Zhigang, LI Chunguang, et al. Failure characteristics analysis for fretting wear fatigue fracture of feed pump turbine blades[J]. Thermal power generation, 2021, 50(6): 157-162. DOI： 10.19666/j.rlfd.202010263.

摘要

某超超临界600 MW机组给水泵汽轮机第2级动叶片在投产初期就发生微动磨损疲劳断裂失效

对此通过故障现场检查

分析断裂叶片的材质和断口形貌

采用有限元计算分析叶片离心应力

以及综合分析叶轮叶片系统振动特性

得到微动磨损疲劳断裂失效的特征及原因。分析认为:动叶片的微动磨损疲劳断裂均起源于叶根第1齿工作面

第1齿工作面和叶顶一侧表面存在轮胎印型擦痕、磨损斑点、表面发亮及小裂纹等磨损痕迹

第1齿工作面截面存在多条呈分层的裂纹

源区的微观组织和硬度与基体相比明显异常

齿面和断口一般无腐蚀性元素;引起第2级动叶片微动磨损疲劳断裂失效的原因为装配质量不良。

Abstract

Fretting wear fatigue fracture failure occurred at the beginning of service of the second stage moving blade of feedwater pump turbine in an ultra supercritical 600 MW unit. Field investigation was performed to analyze the material and fracture morphology of the fractured blade. Moreover

finite element calculation was carried out to study the centrifugal stress of the blade. Through comprehensive analysis on vibration characteristics of the impeller blade system

the failure characteristics and causes of fretting wear were obtained. The results show that

the fretting wear fatigue fracture originated from the first working face of blade root. There existed wear marks such as tire mark

wear spot

surface brightness and small crack on the surface of the first tooth working face and blade top side. There were many cracks with mechanical fatigue which were delamination cracking in the section of the first tooth working face. The microstructure and hardness of the source area were obviously abnormal compared with the matrix. The reason of fretting wear fatigue fracture of the second stage moving blade was poor assembly quality.

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