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Effect Of Residual Strain On Short Time Oxidation Kinetics In PWR Simulated Primary Water

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Type 304 stainless steel is commonly used in pressurized water reactor (PWR) primary circuits, where it is exposed to high temperature, high pressure water. Combination of material and environment influence the oxidation behavior in these systems. In addition to oxidation of the surface, 304 is also susceptible to stress corrosion cracking and corrosion fatigue, which are both types of environmentally assisted cracking, or EAC. EAC is a function of prior material condition, environment, and stress induced during exposure.

Product Number: ED22-17127-SG
Author: Rachel E. Turfitt, John A. Savchik, Bryan A. Webler, Kevin B. Fisher
Publication Date: 2022
$20.00
$20.00
$20.00

Short time oxidation and the effect of residual strain was studied on 304 stainless steel. Residual strain was induced through uniaxial tension and characterized using electron backscatter diffraction. Specimens with machined surface finishes were exposed to high temperature, high pressure water for 10, 50, and 100 hours while mechanically polished specimen were exposed for 100 hours using a specialized system that allows for controlled short time exposure. Nickel rich layers were found to form on top of the inner oxide instead of the normally seen iron rich oxide and inner oxide thickness was found to be much larger than those reported in the literature. Oxidation kinetics followed a parabolic growth rate. The relationship between residual strain and oxidation kinetics is linked to surface finish, which also changes deformation in the near surface microstructure.


Short time oxidation and the effect of residual strain was studied on 304 stainless steel. Residual strain was induced through uniaxial tension and characterized using electron backscatter diffraction. Specimens with machined surface finishes were exposed to high temperature, high pressure water for 10, 50, and 100 hours while mechanically polished specimen were exposed for 100 hours using a specialized system that allows for controlled short time exposure. Nickel rich layers were found to form on top of the inner oxide instead of the normally seen iron rich oxide and inner oxide thickness was found to be much larger than those reported in the literature. Oxidation kinetics followed a parabolic growth rate. The relationship between residual strain and oxidation kinetics is linked to surface finish, which also changes deformation in the near surface microstructure.


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