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Creep-Fatigue Crack Growth at CrMo Steel Weld Interface
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 Title & Authors
Creep-Fatigue Crack Growth at CrMo Steel Weld Interface
Baek, Un-Bong; Yun, Gi-Bong; Lee, Hae-Mu; Seo, Chang-Min;
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Creep-fatigue crack growth behavior was experimentally measured particularly when a crack was located in the heat affected region of lCr-5Mo steel. Load hold times of the tests for trapezoidal fatigue waveshapes were varied among 0, 30, 300 and 3,600 seconds. Time-dependent crack growth rates were characterized by the parameter. It was found that the crack growth rates were the highest when the crack path was located along the fine-grained heat affected zone(FGHAZ). Cracks located in other heat affected regions had a tendency to change the crack path eventually to FGHAZ. Creep-fatigue crack growth law of the studied case is suggested in terms of (da/dt) vs. () for residual life assessment.
Creep-Fatigue Crack growth;Weld Interface;HAZ;Life Assessment;
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