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Adhesion of Oxides Grown in Supercritical Water on Selected Austenitic Alloys.

[+] Author and Article Information
D. Artymowicz

Department of Chemical Engineering and Applied Chemistry, University of Toronto 200 College Street, Toronto, ON, M5S 3E5 Canada
dorota.artymowicz@utoronto.ca

C. Bradley

Department of Chemical Engineering and Applied Chemistry, University of Toronto 200 College Street, Toronto, ON, M5S 3E5 Canada
colin.bradley5@gmail.com

B. Xing

Department of Chemical Engineering and Applied Chemistry, University of Toronto 200 College Street, Toronto, ON, M5S 3E5 Canada
bo.xing@mail.utoronto.ca

R. C. Newman

Department of Chemical Engineering and Applied Chemistry, University of Toronto 200 College Street, Toronto, ON, M5S 3E5 Canada
roger.newman@utoronto.ca

1Corresponding author.

ASME doi:10.1115/1.4035331 History: Received May 30, 2015; Revised October 28, 2016

Abstract

A series of austenitic alloys (800H, H214, I625, 310S and 347) were exposed to supercritical water at 550 ºC and 25 MPa for 260 h and 450 h in a static autoclave with an initial level of dissolved oxygen of 8 ppm. Cross sections of oxidized samples were imaged with SEM and analysed with EDS for the composition of the oxide layer(s). Indentation with a hardness indenter was used for assessment of oxide adhesion. Mass loss was obtained through descaling. Two surface finishes were applied - a coarse grinding with 120 grit abrasive (applied by the manufacturer) or polishing with either 1200 grit, 1 ?m diamond or 0.05 ?m alumina suspension. The only sample which delaminated during indentation was polished H214 (both alumina and 1 ?m).

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