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RESEARCH PAPERS

Material Property Studies of Two High-Pressure Turbine Rotors for Remaining Life Assessment

[+] Author and Article Information
V. P. Swaminathan

Southwest Research Institute, San Antonio, TX 78228

R. Viswanathan

Electric Power Research Institute, Palo Alto, CA 94304

C. P. Clark

Central Maine Power Company, Augusta, ME 04336

J. Eng. Mater. Technol 116(1), 19-26 (Jan 01, 1994) (8 pages) doi:10.1115/1.2904250 History: Received January 12, 1992; Revised May 13, 1993; Online April 29, 2008

Abstract

A remaining life assessment study was performed on two no-bore HP rotors after 169,000 hours of operation. These rotors were manufactured from 1CrMoV (ASTM A470, Class 8) steel. Southwest Research Institute conducted a materials evaluation program to generate pertinent material property data necessary to perform a SAFER analysis by Lehigh University. Two ring samples were removed from periphery locations of a rotor. One of the rings was from a packing location where the operating metal temperature was 860°F (460°C), and the other ring from the cold coupling end. Evaluation tests included chemical analysis, metallography, Auger analysis, tension and hardness, Charpy impact, fracture toughness, and stress rupture. A small sliver sample was available from the second rotor. Limited metallurgical analysis was conducted on this sample. Results indicated that the hot end embrittled in service with a shift in FATT of 240°F (116°C) when compared to the cold end. Fracture toughness versus temperature data were developed using various correlations available from the literature. Good correlation was found among the various procedures and lower bound curves were established for the hot and cold ends. Hot end toughness properties were significantly lower than those of the cold end. Auger results indicated segregation of phosphorus on the grain boundaries at the hot location. After service FATT can be predicted using the bulk phosphorus content and correlations available from the literature.

Copyright © 1994 by The American Society of Mechanical Engineers
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