Abstract：Tensile residual stresses caused in manufacturing processes are the main reason of decreasing in corrosion fatigue property of structures. Applying ultrasonic impact treatment is one of the promising and effective methods for enhancing corrosion fatigue properties of materials. In this work, effect of ultrasonic impact treatment on corrosion fatigue behavior of A106-B welded steel pipe, provided by a gas refinery, has been investigated. The results indicated that ultrasonic impact treatment modified the weld toe geometry obviously, weld toe angle is reduced by 50% and weld toe radius is increased by 15.5 times, the stress concentration decreases significantly. Meanwhile, the surface tensile residual stress releases effectively. And the compressive stress is introduced in the sub-surface region. In addition, grain refinement is observed in the surface region of the material. Hence, after ultrasonic impact treatment, both corrosion resistance and fatigue resistance of the specimens are improved, the corrosion fatigue life is increased by 99.4%.
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2019, Vol. 24 
