Failure analysis of a Pelton turbine manufactured in soft martensitic stainless steel casting

被引：22

作者：

Ferreno, D. ^{[1
]}

Alvarez, J. A. ^{[1
]}

Ruiz, E. ^{[1
]}

Mendez, D. ^{[1
]}

Rodriguez, L. ^{[2
]}

Hernandez, D. ^{[2
]}

机构：

[1] Univ Cantabria, LADICIM, ETS Ingn Caminos, E-39005 Santander, Spain

[2] Univ Cantabria, Tech & Sci Res Serv, E-39005 Santander, Spain

来源：

ENGINEERING FAILURE ANALYSIS | 2011年 / 18卷 / 01期

关键词：

Pelton turbine; CA-6NM stainless steel; Finite elements; Temper embrittlement;

D O I：

10.1016/j.engfailanal.2010.09.005

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In this paper the failure of a large Pelton turbine arising immediately after receiving a quenching and tempering heat treatment is analysed The turbine was manufactured in ASTM CA-6NM soft martensitic stainless steel A thermo-mechanical finite elements model was developed to evaluate the homogeneity of the heat treatment for this purpose the thermal histories of internal and external points of the component were compared and the possible existence of temper embritlement was assessed Moreover the thermal stresses during heat treatment were obtained in order to perform a failure analysis After analysing the fracture surface through visual inspection and scanning electron microscope fractography the material properties were characterised all around the fracture surface including optical and transmission electron microscopy chemical composition and Vickers and Charpy impact tests All this experimental information allowed a satisfactory understanding of the phenomenon to be obtained and a failure analysis to be performed in order to justify the fracture of the component (C) 2010 Elsevier Ltd All rights reserved

引用

页码：256 / 270

页数：15