Abstract
ABSTRACT Damage behaviour and deformation mechanism of SA387Gr11CL2 (1.25Cr-0.5Mo) low alloy steel for coke drum in the thermomechanical fatigue regime are investigated. The experimental results indicate that a main macroscopic crack is detected in the gauge section of each testing specimen. Multiple crack initiation sources are observed in the fracture surface. There are a great deal of secondary cracks in the crack propagation region of the fracture surface. Longitudinal-section microcrack initiates on the specimen surface and its propagation path is predominantly transgranular. When the crack propagation arrives at the threshold with the cyclic number increase, crack bifurcation is obviously observed. Fatigue is the dominant damage of SA387Gr11CL2 low alloy steel under the thermomechanical fatigue loading. The dominant deformation mechanism of SA387Gr11CL2 low alloy steel during thermomechanical fatigue cycle is wavy slip of dislocations. The types and morphologies of carbides in SA387Gr11CL2 low alloy steel are not changed after plastic deformation.
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