Some Observations on The Carburisation of Type 316 Stainless Steel Foil in A Low Carbon Activity Sodium Environment
This paper describes work currently being undertaken at the Risley Nuclear Laboratories (RNL) to establish the equilibrium composition of carbides which form in stainless steel foils during their exposure to a low carbon activity sodium environment. The experiment is the first in a series which aim to study the equilibrium compositions of carbides which form in stainless steel foils and the time it takes the carbon to reach equilibrium during exposure to sodium of different carbon activity. The first part of the study, which is reported in this paper, deals with the lowest carbon activity measureable in our test loops where the sodium is just about carburising to stainless steel. Analytical techniques are used to determine the composition of the carbide and the austenite matrix and hence to estimate the carbon activity of the equilibrium structure. This provides a comparison with carbon activity values determined by alternative methods such as the Harwell Carbon Meter (HCM) and nickel tab techniques.
KeywordsCarbon Activity Metallurgical Transaction Carbide Particle Carbide Phase Lave Phase
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