Abstract
The artificial interrupted creep-fatigue test was carried out to quantitatively investigate crack initiation and propagation rate of the CrMoV steel welded joint at 520 °C. The evolution of crack and the role of oxide could be clarified clearly by several stages. A crack of 1.6 μm length initiated on the oxide in the first 10 cycles. Then, crack propagated inside the oxide layer with a low rate, forming a periodic multilayer bamboo-like structure. Meanwhile, further oxidation resulted in deepening of oxide notches. Finally, cracks penetrated the oxide with a rate of 50 μm/cycle into the matrix resulting in the rupture.
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