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Fatigue Crack Propagation of 304 Stainless Steel in High Temperature Water: Additional Tests and Data Correlation

[+] Author Affiliations
G. L. Wire, W. M. Evans, W. J. Mills

Bechtel Bettis, Inc., West Mifflin, PA

Paper No. PVP2005-71608, pp. 207-222; 16 pages
doi:10.1115/PVP2005-71608
From:
  • ASME 2005 Pressure Vessels and Piping Conference
  • Volume 1: Codes and Standards
  • Denver, Colorado, USA, July 17–21, 2005
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4186-3 | eISBN: 0-7918-3763-7
  • Copyright © 2005 by ASME

abstract

Fatigue crack propagation (FCP) testing of 304 stainless steel (304 SS) specimens showed a strong acceleration of rates in high temperature water with 40–60 cc H2 /kg H2 O at 243°C and 288°C, with rates up to 20X the air rates [1]. However, FCP rates were markedly reduced for a second heat at long rise times and for both heats with addition of a constant load hold time of 1200 s at a high stress ratio [2]. Such behavior had not been previously reported in the literature and merited further investigation. Tests have been extended to include two additional heats and a wider set of loading conditions. FCP rates were accelerated at long rise times in the two additional heats, consistent with a large series of tests on wrought, weld, and cast austenitic stainless steel materials recently reported by Nomura, et al. [3]. Hold time tests at a lower stress ratio showed that small increases or decreases in rate occur with holds at minimum or maximum load, but the changes were within normal data scatter. The rate reductions are not a generic result of less frequent cycling, but are limited to specific loading parameters or heats. A time-based correlation successfully describes the accelerated rates observed on all four heats, and is nearly identical to fits of literature data in PWR water and hydrogen water chemistry (HWC). A power law fit with separate terms for rise time, ΔK, and stress ratio provides an equivalent correlation.

Copyright © 2005 by ASME

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