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Vol.40, No.9, 949 ~ 957, 2002

Title

Mechanical Behaviors : Tensile and Corrosion Behaviors of As - solutionized CD4MCU Cast Duplex Stainless Steel with Different Nitrogen Contents

손진일J. L. Son,김상식S. S. Kim,이재현J. H. Lee,최병호B. H. Choi

Abstract

Effect of nitrogen contents on the microstructure, tensile and corrosion behaviors of as-solutionized CD4MCU (Fe-25Cr-5Ni-2.8Cu-2Mo) cast duplex stainless steel was examined in the present study. The slow strain rate test was conducted at a nominal strain rate of 1×10^(-6)/sec in air and 3.5% NaCl+5% H2SO4 solution for studying the stress corrosion cracking behavior of the present alloy. It was observed that the volume fraction of austenitic phase in CD4MCU alloy increased from 38% to 58% with increasing nitrogen content from 0 to 0.27 wt.%. The tensile behavior of CD4MCU alloy showed a complex trend depending on the volume fraction and shape of austentic phases as associated with nitrogen content. The resistance to general corrosion of CD4MCU alloy was significantly improved with the addition of nitrogen. The difference in the magnitude of the improvement with different nitrogen contents was, however, not significant for the present alloy. The % change in tensile elongation in 3.5% NaCl+5% H2SO4 solution with respect to air for slow strain rate test was gradually reduced with increasing nitrogen content up to 0.27%. The stress corrosion cracks observed in high-nitrogen CD4MCU alloy was confined within the ferritic phases and not fully developed to the sharp cracks due to the globular shaped austenitic phases.

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