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Technical Brief

Development of Fatigue Crack Growth Thresholds for Austenitic Stainless Steels exposed to Air Environment for ASME Code Section XI

[+] Author and Article Information
Kunio Hasegawa

Consultant, Center of Advanced Innovation Technologies, Technical University of Ostrava, 17. Listopadu 15/2172, 708 33, Ostrava-Poruba, Czech
kunioh@kzh.biglobe.ne.jp

Saburo Usami

Hitachi, Ltd. Hitachi-shi, Ibaraki-ken, 319-1292, Japan
saburo.usami.ak@hitachi.com

1Corresponding author.

ASME doi:10.1115/1.4039207 History: Received September 11, 2017; Revised January 25, 2018

Abstract

Fatigue crack growth thresholds define stress intensity factor range below which cracks will not grow. The thresholds are useful in industries to determine durability lifetime. Although massive fatigue crack growth experiments for stainless steels in air environment had been reported, the thresholds are not codified at the ASME (American Society of Mechanical Engineers) Code Section XI, as well as other fitness-for-service (FFS) codes and standards. Based on investigation of a few FFS codes and review of literature survey of experimental data, the thresholds exposed to air environment have been developed for the ASME Code Section XI. A guidance of the thresholds for austenitic stainless steels in air at room and high temperatures can be developed as a function of stress ratio R.

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