Effects of water flow rate on fatigue life of structural steels under simulated BWR environment

Akiniko Hirano, Katsumi Sakaguchi, Tetsuo Shoji

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Fatigue tests in simulated LWR environment of carbon and stainless steels were performed under high water flow rates between 7 to 10 m/s. For carbon steel, high flow rate of water clearly mitigated the environmental effect on the fatigue life at the high sulfur concentration of 0.016 % which caused high environmental effect on a fatigue life. On the contrary, high flow rate of water slightly enhanced the environmental effect at the low sulfur concentration at or less than 0.008 % which caused very low environmental effect. These results suggested that the environmental fatigue life under various flow rate conditions should be determined by the combination between the mitigating effect caused by flushing of the severe local environment and the enhancing effect caused by increase in corrosion potential. Low alloy steel showed the similar behavior as carbon steel. For stainless steel, flow rate had little effect on the fatigue life of type 316NG stainless steel. It suggested that there was no role of water flushing. For type 304 and 304L stainless steel, fatigue life has a tendency to decrease with increase in water flow rate. Fatigue lives of type 304 stainless steel under high flow rate of 7 to 10 m/s were shorter than those predicted by proposed fatigue life prediction equation by the Japanese EFT committee. This effect should be considered in an evaluation of environmental fatigue. No water flow effect was found in cast stainless steel.

Original languageEnglish
Title of host publication2007 Proceedings of the ASME Pressure Vessels and Piping Conference - Codes and Standards
Pages231-242
Number of pages12
DOIs
Publication statusPublished - 2008
Externally publishedYes
Event2007 ASME Pressure Vessels and Piping Conference, PVP 2007 - San Antonio, TX, United States
Duration: 2007 Jul 222007 Jul 26

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume1
ISSN (Print)0277-027X

Other

Other2007 ASME Pressure Vessels and Piping Conference, PVP 2007
Country/TerritoryUnited States
CitySan Antonio, TX
Period07/7/2207/7/26

ASJC Scopus subject areas

  • Mechanical Engineering

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