Metallurgical Characterization of a High-Pressure Rotor for Remaining Service Life Assessment After 26 Years of Service

Author:

Cheruvu N. S.1,Malmfeldt L. R.2

Affiliation:

1. Westinghouse Electric Corporation, Orlando, FL 32826

2. Pacific Gas and Electric Co., San Francisco, CA 94106

Abstract

In-service material degradation of a high-pressure rotor steel has been investigated for remaining service life assessment. The samples for this study were taken from the cold and hot locations of a rotor that had operated for approximately 167,500 hours. The test results have indicated that the rotor steel is slightly softened and temper embrittled as a result of service exposure. Based on isostress creep rupture data of the rotor steel in the service-exposure. Based on isostress creep rupture data of the rotor steel in the service-exposed condition, it is concluded that crack initiation due to creep is not a concern in the near future. Considering the uncertainties associated with the extrapolation of short-time rupture data on remaining service life assessment, the rotor material should be re-evaluated for degradation of properties after the next 10 years of operation.

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Cyclic softening properties of 30Cr2MoV steel at elevated temperatures;Metals and Materials International;2001-02

2. Characterization of Seven Power-Generating Turbine Rotors Using Microscopy-Based Techniques;Journal of Materials Engineering and Performance;1998-10-01

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