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Local mechanical properties of corrosion layers formed on T91 and SS316L steels after exposure to static liquid LBE at 500 °C for 1000 h obtained by nano-indentation

Du Juan|Zhou Zhikun|Tian Chenwen|Peng Xuhao|Wu Yabo|Lv Xi|Zhang Yixiong|Chen Ziguang
한국원자력학회 (Korean Nuclear Society)|2024.08|Nuclear Engineering and Technology|제56권 제8호|pp. 3067-3075|DOI 10.1016/j.net.2024.03.005

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키워드

DissolutionOxidationNano-indentationT91 steelLBESS316L steel
주제분류원자력공학

초록

Static corrosion tests in LBE under oxygen-saturated and –depleted conditions at 500 ◦C for 1000 h were conducted to investigate the corrosion-induced diffusion layers on T91 and SS316L steels subject to dissolution and oxidation corrosion. Following nano-indentation experiments examined the variations of local mechanical properties within the corrosion layers. Under the present conditions, T91 steel showed better resistance to dissolution corrosion while higher susceptibility to oxidation corrosion against SS316L. For both steels, nanoindentation results showed a gradual decrease in mechanical properties from steel matrix to the corrosion side after dissolution corrosion. When subject to oxidation corrosion, the oxide scale formed on T91 steel showed lower Er-modulus and enhanced hardness in comparison with those of the steel matrix. An obvious decrease in both modulus and hardness was found at the interface between steel matrix and oxide scale.

Abstract

Static corrosion tests in LBE under oxygen-saturated and –depleted conditions at 500 ◦C for 1000 h were conducted to investigate the corrosion-induced diffusion layers on T91 and SS316L steels subject to dissolution and oxidation corrosion. Following nano-indentation experiments examined the variations of local mechanical properties within the corrosion layers. Under the present conditions, T91 steel showed better resistance to dissolution corrosion while higher susceptibility to oxidation corrosion against SS316L. For both steels, nanoindentation results showed a gradual decrease in mechanical properties from steel matrix to the corrosion side after dissolution corrosion. When subject to oxidation corrosion, the oxide scale formed on T91 steel showed lower Er-modulus and enhanced hardness in comparison with those of the steel matrix. An obvious decrease in both modulus and hardness was found at the interface between steel matrix and oxide scale.

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