Creep-fatigue crack behaviour has been investigated for a welded component with 316L stainless steel and Mod. 9Cr-1Mo steel through an assessment and test. The evaluation of creep-fatigue crack initiation and propagation was carried out for 316L stainless steel according to the French RCC-MR A16 guide, and evaluation on creep-fatigue crack initiation for Mod.9Cr-1Mo steel in a specimen was carried out with an extended A16 method. A test for a structural specimen with a diameter of 500mm, height of 440mm and thickness of 6.3mm was performed to compare its results with that by assessment according to the A16 guide. The specimen was subjected to creep-fatigue loads with two hours of a dwell time at 600°C and variable primary loads. The creep-fatigue crack behaviours for the two materials were assessed, observed and compared. The results showed that the A16 guide for the austenitic stainless steel was overly conservative for the assessment of creep-fatigue crack initiation while it was reasonably conservative for creep-fatigue crack growth for the present specimen.

Volume Subject Area:
Codes and Standards
Topics:
Creep, Fatigue, Fracture (Materials), High temperature, Stainless steel, Steel, Stress
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