The effect of high temperature carburization upon the ambient temperature ductility of Alloy 800H

Abstract

This paper presents the results of a series of tests designed to assess the changes in ambient temperature ductility of Alloy BOOH, a 20%Cr-32%Ni austenitic steel, resulting from exposure to an aggressive carburizing environment at 10000°C. A gas mixture of H₂-CH₄ with 0.8 carbon activity has been used as the corrosive medium and postexposure compression testing of the carburized tubular specimens has enabled the significant reduction in ductility accompanying the uptake of carbon to be demonstrated and understood.