Abstract
The effect of low oxygen-partial pressured carburizing on relaxation process for 316L stainless steel is reported. Phase, morphology, and amount of compound formation during initial stage of carburizing are investigated using X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). The results show formation and development of surface multilayer with nano-grain-carbide (Cr7C3, Fe7C3, and/or Cr3C2) generation in the layer located below outermost protective layer. The relaxation process has been investigated using electrochemical impedance spectroscopy (EIS). Formation of nano-grain carbide(s) during carburizing causes deterioration effect on the electrochemical behavior of steel. However, the steel with large amount of carbide generation (carburized for 30 min) tends to have higher corrosion resistance (indicated by higher values of Rcl and Rct) than the smaller ones (10 and 20 min) due to the effect of phase, grain size, morphology, and amount of compound formation.
Highlights
The effect of low oxygen-partial pressured carburizing on relaxation process for 316L stainless steel is reported
The multilayer of treated steels consisted of nano-grain carbide(s) generated in the compound layer that located between outermost protective layer and inner base stainless steel
The results show that formation of nano-grain carbide(s) during carburizing had deterioration effect on the electrochemical behavior of steel due to disturbance of formation of protective layer by delaying the growth of layer to achieve the critical thickness of protection[54,55]
Summary
The effect of low oxygen-partial pressured carburizing on relaxation process for 316L stainless steel is reported. Formation of nano-grain carbide(s) during carburizing causes deterioration effect on the electrochemical behavior of steel. The steel with large amount of carbide generation (carburized for 30 min) tends to have higher corrosion resistance (indicated by higher values of Rcl and Rct) than the smaller ones (10 and 20 min) due to the effect of phase, grain size, morphology, and amount of compound formation. Our current study reports on effect of nano-grain carbide formation on electrochemical relaxation process for 316L austenitic stainless steel carburized in low oxygen-partial pressure. Such carbon rich environment corresponds to actual service environment that contains carbon monoxide, methane, or other h ydrocarbons[1]. The effect of carburizing (phase, morphology, and amount of compound formation) on wet corrosion and critical period of service of the steel have been discussed
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