Steam turbine rotor discs failure evaluation and repair process implementation

被引：22

作者：

Mazur, Zdzislaw ^{[1
]}

Hernandez-Rossette, Alejandro ^{[1
]}

机构：

[1] Inst Invest Elect, Cuernavaca 62490, Morelos, Mexico

来源：

ENGINEERING FAILURE ANALYSIS | 2015年 / 56卷

关键词：

Damage; Stress corrosion; Steam turbine; Rotor disc; AFFECTED ZONE HAZ; MO-V STEEL; NUMERICAL PREDICTION; DEPOSITS;

D O I：

10.1016/j.engfailanal.2014.10.010

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Two rotor discs failed in a 84-MW unit installed in a power plant. The failure was evidenced by large circumferential fractures of blades attachments in both discs. Disc failure was evaluated by investigating rotor operation history, steady state stress analysis by finite element (FEA), disc fracture surface fractography and deposit evaluation. It was found that this disc failure was driven by stress corrosion due to significant static stresses, humid ambient operation and disc material susceptibility. To correct disc failure and restore turbine original characteristics, a disc welding repair procedure was developed. This repair process was implemented and rotor discs restored by weld deposition, post weld heat treatment and machining. As a result, the rotor was returned to service and its useful life extended. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：545 / 554

页数：10

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