Oxidation Behaviour of Solution-Annealed and Thermally-Treated Alloy 690 in Low Pressure H2-Steam

Liberato Volpe; M. Grace Burke; Fabio Scenini

doi:10.1016/j.corsci.2020.108514

Oxidation Behaviour of Solution-Annealed and Thermally-Treated Alloy 690 in Low Pressure H2-Steam

Liberato Volpe, M. Grace Burke, Fabio Scenini

Materials Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Oxidation experiments were performed on Alloy 690 in a low pressure H2-steam environment at 480 °C to investigate the effects of the microstructure and thermal treatment on the “precursors events” associated with Primary Water Stress Corrosion Cracking. Advanced analytical electron microscopy characterisation revealed that the Alloy 690 did not exhibit preferential intergranular oxidation but rather only diffusion-induced grain boundary migration promoted by the formation of an external Cr2O3 oxide layer for both material conditions (solution-annealed vs. thermally-treated). These data demonstrate that for Alloy 690 the diffusion-induced grain boundary migration is a necessary but not sufficient condition for preferential intergranular oxidation.

Original language	English
Journal	Corrosion Science
Early online date	31 Jan 2020
DOIs	https://doi.org/10.1016/j.corsci.2020.108514
Publication status	E-pub ahead of print - 31 Jan 2020

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title = "Oxidation Behaviour of Solution-Annealed and Thermally-Treated Alloy 690 in Low Pressure H2-Steam",

abstract = "Oxidation experiments were performed on Alloy 690 in a low pressure H2-steam environment at 480 °C to investigate the effects of the microstructure and thermal treatment on the “precursors events” associated with Primary Water Stress Corrosion Cracking. Advanced analytical electron microscopy characterisation revealed that the Alloy 690 did not exhibit preferential intergranular oxidation but rather only diffusion-induced grain boundary migration promoted by the formation of an external Cr2O3 oxide layer for both material conditions (solution-annealed vs. thermally-treated). These data demonstrate that for Alloy 690 the diffusion-induced grain boundary migration is a necessary but not sufficient condition for preferential intergranular oxidation.",

author = "Liberato Volpe and Burke, {M. Grace} and Fabio Scenini",

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T1 - Oxidation Behaviour of Solution-Annealed and Thermally-Treated Alloy 690 in Low Pressure H2-Steam

AU - Volpe, Liberato

AU - Burke, M. Grace

AU - Scenini, Fabio

PY - 2020/1/31

Y1 - 2020/1/31

N2 - Oxidation experiments were performed on Alloy 690 in a low pressure H2-steam environment at 480 °C to investigate the effects of the microstructure and thermal treatment on the “precursors events” associated with Primary Water Stress Corrosion Cracking. Advanced analytical electron microscopy characterisation revealed that the Alloy 690 did not exhibit preferential intergranular oxidation but rather only diffusion-induced grain boundary migration promoted by the formation of an external Cr2O3 oxide layer for both material conditions (solution-annealed vs. thermally-treated). These data demonstrate that for Alloy 690 the diffusion-induced grain boundary migration is a necessary but not sufficient condition for preferential intergranular oxidation.

AB - Oxidation experiments were performed on Alloy 690 in a low pressure H2-steam environment at 480 °C to investigate the effects of the microstructure and thermal treatment on the “precursors events” associated with Primary Water Stress Corrosion Cracking. Advanced analytical electron microscopy characterisation revealed that the Alloy 690 did not exhibit preferential intergranular oxidation but rather only diffusion-induced grain boundary migration promoted by the formation of an external Cr2O3 oxide layer for both material conditions (solution-annealed vs. thermally-treated). These data demonstrate that for Alloy 690 the diffusion-induced grain boundary migration is a necessary but not sufficient condition for preferential intergranular oxidation.

U2 - 10.1016/j.corsci.2020.108514

DO - 10.1016/j.corsci.2020.108514

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SN - 0010-938X

JO - Corrosion Science

JF - Corrosion Science

ER -

Oxidation Behaviour of Solution-Annealed and Thermally-Treated Alloy 690 in Low Pressure H2-Steam

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