Erosion-fatigue of steam turbine blades

被引：57

作者：

Azevedo, C. R. F. ^{[1
]}

Sinatora, A. ^{[1
]}

机构：

[1] Univ Sao Paulo, Escola Politecn, BR-05508030 Sao Paulo, Brazil

来源：

ENGINEERING FAILURE ANALYSIS | 2009年 / 16卷 / 07期

关键词：

Erosion-fatigue; Steam turbine; Blades; Solid-particle erosion; Martensitic steel; PARTICLE EROSION; SURFACE; IMPACT; VISUALIZATION;

D O I：

10.1016/j.engfailanal.2009.03.007

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The premature failure of steam turbine rotor blades, manufactured in forged 12% Cr-NiMoV martensitic stainless steel, was investigated using visual inspection non-destructive testing, macro and microfractography, microstructural characterization, EDS microanalysis, chemical analysis, micro hardness and tensile testing. The blades belonged to the last stage of a thermoelectric plant steam turbine generator (140 MV A). The results indicated that the failure of the blades was promoted by foreign-particle erosion, which attacked preferentially the low-pressure side of the lower trailing edge of the blades. The resulting wear grooves acted as stress raisers and promoted the nucleation of fatigue cracks, which probably grew during the transition events of the steam turbine operation. Finally, water drop erosion was observed on the blade upper leading edge (low-pressure side). (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：2290 / 2303

页数：14

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