발간논문

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Vol.40, No.7, 776 ~ 784, 2002
Title
Research Papers / Environment : Effect of Environmental Factors of Stress Corrosion Cracking Behavior of Turbine Steel in Pure Water
맹완영W. Y. Maeng,이진형J. H. Lee,김우철U. C. Kim,원창환C. W. Won
Abstract
Slow Strain Rate Tests(SSRT) were carried out to investigate the effect of dissolved oxygen on stress corrosion cracking(SCC) susceptibility of 3.5NiCrMoV steels used in discs of low-pressure(LP) steam turbines in electric power generating plants. The influence of dissolved oxygen on cracking in water was studied; for this purpose, specimens were strained to fracture at 150℃ in water environments with various amounts of dissolved oxygen. Also Tests were conducted in aerated water at temperature of 50∼200℃ and at various strain rates (5×10^-8∼1×10^-5 s-1). The maximum elongation of the turbine steel decreased with decreasing strain rate, and with increasing temperature. Dissolved oxygen significantly affected the SCC susceptibility of turbine steel in water. The increase of the SCC susceptibility of the turbine steel in a higher dissolved oxygen environment is due to the non protectiveness of the oxide layer of the turbine steel surface and the increase of corrosion current.
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