A comparison between thermo‐mechanical fatigue of 5 % and 9 % chromium steels (original) (raw)

1999

Abstract

Tubular specimen of 5 % and 9 % chromium steels have been tested under out‐of‐phase thermomechanical low cycle fatigue (OP TMF) in air. The temperature range was 200 ‐ 600 degrees C and the strain range 0.4 % through 1.0 % (F82H‐mod, 9 % Cr) and 0.5 % through 1.5 % (AISI H11, 5 % Cr) (R‐epsilon = ‐infinity). Both steels presented a continuous cyclic softening until total fracture of specimens. Specimen surfaces were oxidized and two oxide layers were found. A combined thermo‐mechanical fatigue (TMF) and oxidation was found as the main crack initiation mechanism. TMF life have been examinated on the basis of mechanical strain, inelastic strain and stress amplitudes.

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