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Title: Life assessment using metallographic and mechanical methods

Abstract

Life extension of fossil fuel power plants beyond their classically defined design life is being practiced today by many utilities. The emergence of this aftermarket has lead to recent advances in component inspection, monitoring techniques, and remaining life assessment techniques. This article discusses quantitative metallography models for life assessment, component sampling techniques, and remaining life assessment using postexposure testing. The recovery creep model for 1Cr-1/2Mo base material uses the interparticle spacing measured on carbon extraction replicas to calculate the strain-time curve. The constrained cavity growth metallographic model for the HAZ material measures the number fraction of grain boundaries undergoing cavitation by light optical microscopy and predicts the fraction of rupture life consumed by prior service. The widely used Neubauer qualitative level was shown to correlate with the life fraction consumed. The remaining life prediction techniques for elevated temperature headers include isostress direct temperature extrapolation, the life fraction rule, and strain assessment techniques.

Authors:
 [1]
  1. (ABB Combustion Engineering Systems, Chattanooga, TN (United States). Metallurgical and Materials Lab.)
Publication Date:
OSTI Identifier:
5102404
Resource Type:
Journal Article
Journal Name:
Materials Characterization; (United States)
Additional Journal Information:
Journal Volume: 32:2; Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 36 MATERIALS SCIENCE; EQUIPMENT; SERVICE LIFE; FOSSIL-FUEL POWER PLANTS; STEELS; MECHANICAL TESTS; METALLOGRAPHY; DEFORMATION; FAILURE MODE ANALYSIS; ALLOYS; IRON ALLOYS; IRON BASE ALLOYS; LIFETIME; MATERIALS TESTING; POWER PLANTS; SYSTEM FAILURE ANALYSIS; SYSTEMS ANALYSIS; TESTING; THERMAL POWER PLANTS; 200104* - Fossil-Fueled Power Plants- Components; 360103 - Metals & Alloys- Mechanical Properties

Citation Formats

Ellis, F.V. Life assessment using metallographic and mechanical methods. United States: N. p., 1994. Web. doi:10.1016/1044-5803(94)90094-9.
Ellis, F.V. Life assessment using metallographic and mechanical methods. United States. doi:10.1016/1044-5803(94)90094-9.
Ellis, F.V. Tue . "Life assessment using metallographic and mechanical methods". United States. doi:10.1016/1044-5803(94)90094-9.
@article{osti_5102404,
title = {Life assessment using metallographic and mechanical methods},
author = {Ellis, F.V.},
abstractNote = {Life extension of fossil fuel power plants beyond their classically defined design life is being practiced today by many utilities. The emergence of this aftermarket has lead to recent advances in component inspection, monitoring techniques, and remaining life assessment techniques. This article discusses quantitative metallography models for life assessment, component sampling techniques, and remaining life assessment using postexposure testing. The recovery creep model for 1Cr-1/2Mo base material uses the interparticle spacing measured on carbon extraction replicas to calculate the strain-time curve. The constrained cavity growth metallographic model for the HAZ material measures the number fraction of grain boundaries undergoing cavitation by light optical microscopy and predicts the fraction of rupture life consumed by prior service. The widely used Neubauer qualitative level was shown to correlate with the life fraction consumed. The remaining life prediction techniques for elevated temperature headers include isostress direct temperature extrapolation, the life fraction rule, and strain assessment techniques.},
doi = {10.1016/1044-5803(94)90094-9},
journal = {Materials Characterization; (United States)},
issn = {1044-5803},
number = ,
volume = 32:2,
place = {United States},
year = {1994},
month = {3}
}