Effect of Niobium on Corrosion Fatigue Properties of High Strength Steel
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In this study, the effect of Nb alloying element on the corrosion fatigue properties of high strength steelis investigated by conducting fatigue experiments under corrosive condition and hydrogen induced condition,potentiodynamic polarization test, tensile test and surface analyses. Nb element is added to enhance themechanical property of medium carbon steel. This element forms MX-type phases such as carbides andnitrides which are playing an important role in the grain refinement. The grain refinement is one of theeffective way to improve mechanical property because both tensile strength and toughness can be improvedat the same time. However, MX-type phase precipitates can be a susceptible site to localized corrosionin corrosive environment due to the potential difference between matrix and precipitate. The obtained resultsshowed that Nb-added steel improved corrosion fatigue property by grain refinement. However, it is degradedfor hydrogen-induced fatigue property due to Nb, Ti-inclusions acting as a stronger trap.
Abstract
In this study, the effect of Nb alloying element on the corrosion fatigue properties of high strength steelis investigated by conducting fatigue experiments under corrosive condition and hydrogen induced condition,potentiodynamic polarization test, tensile test and surface analyses. Nb element is added to enhance themechanical property of medium carbon steel. This element forms MX-type phases such as carbides andnitrides which are playing an important role in the grain refinement. The grain refinement is one of theeffective way to improve mechanical property because both tensile strength and toughness can be improvedat the same time. However, MX-type phase precipitates can be a susceptible site to localized corrosionin corrosive environment due to the potential difference between matrix and precipitate. The obtained resultsshowed that Nb-added steel improved corrosion fatigue property by grain refinement. However, it is degradedfor hydrogen-induced fatigue property due to Nb, Ti-inclusions acting as a stronger trap.
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