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2 Archives of Metallurgy and Materials

2 2017

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Oxidation Behavior of Steel with Cr Content and Water Flow Rate

Kim D.-J., Kim K. M., Shin J. H., Cheong Y. M., Lee E. H., Lee G. G., Kim S. W., Kim H. P., Choi M. J., Lim Y. S., Hwang S. S.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2B

1383--1387

Fast water flow facilitates ferrous ion transport leading to flow accelerated corrosion (FAC) of carbon steel and the possibility of a large accident through a failure of a secondary pipe in a nuclear power plant. Ion transport is directly linked to oxide properties such as the thickness, chemical composition and porosity. This work deals with a precise observation of the cross section of the corroded specimen focusing on an oxide passivity and its thickness using SEM (scanning electron microscope) and TEM (transmission electron microscope) as well as an apparent weight loss and a surface observation for the specimens corroded using a rotating cylindrical electrode autoclave system in pure water of pH 7 at 150°C having dissolved oxygen below 1 ppb within a flow rate range of 0 to 10 m/s. The Cr content in steel was changed from 0.02 to 2.4 wt%. Increasing the Cr content in the alloy, the FAC rate and oxide thickness decreased. The oxide porosity tends to decrease with the Cr content and immersion time owing to the development of Cr containing oxide. The oxidation behavior is not changed with the immersion time.

Effects of Grain Boundary Morphologies on Stress Corrosion Cracking of Alloy 600

Kim H. P., Choi M. J., Kim S. W., Kim D. J., Lim Y. S., Hwang S. S.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2B

1415--1419

Effects of grain boundary morphologies on stress corrosion cracking (SCC) of Alloy 600 have been studied in 40% NaOH at 315°C using C-ring specimens. The configuration of the grain boundary and the intergranular carbide density were controlled by heat treatment. SCC tests were performed at +150 mV above the corrosion potential. The specimen with a serrated grain boundary showed higher SCC resistance than that with a straight grain boundary. This appears to be caused by the fact that the specimen with the serrated grain boundary has longer SCC path. SCC resistance also increased with intergranular carbide density probably due to enhanced relaxation of stress at intergranular carbide.