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The Effect of Load Ratio on the Fatigue Crack Growth Rate of Type 304 Stainless Steels in Air and High Temperature Deaerated Water at 482 °F

  • D. J. ParaventiEmail author
  • C. M. Brown
  • L. B. O’Brien
  • B. A. McGraw
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

A test program has been completed that re-examined the effect of load ratio, R, on fatigue crack growth rates (FCGRs) of austenitic stainless steel in 482 °F air and deaerated water. Data for the test program were collected at R between 0.1 and 0.95 and ΔK values between 2.5 and 50 ksi√in to ensure an overlapping dataset in R and ∆K. In contrast to the single Paris slope relationship in the ASME code, results from air tests revealed a three-regime curve across many R: a high ΔK regime similar to ASME, an intermediate ΔK regime with a decreased power law exponent and a low ΔK region where FCGR exhibit a steep downturn. Water FCGRs showed two regimes—a single power law regime and a steep low ΔK regime. FCGR sensitivity to R was greatest in the low ΔK regime for both environments.

Keywords

304 SS 304L SS Stainless steel Corrosion fatigue Load ratio effects Fatigue crack growth 

Notes

Acknowledgements

The following organizations and their staff (past and present) are gratefully acknowledged: Naval Nuclear Laboratory—Bettis Advanced Materials Testing Laboratory, Mechanical Testing, and Welding Laboratory. This work is the result of the efforts started by and the insight of the late Dr. William J. Mills.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • D. J. Paraventi
    • 1
    Email author
  • C. M. Brown
    • 1
  • L. B. O’Brien
    • 2
  • B. A. McGraw
    • 3
  1. 1.Bechtel Marine Propulsion CorporationWest MifflinUSA
  2. 2.Bechtel Marine Propulsion CorporationNiskayunaUSA
  3. 3.Dawar TechnologiesPittsburghUSA

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