Effects of Mn, Si, Cr and Ni on the Solution and Precipitation of Niobium Carbide in Iron Austenite

Abstract

The influence of manganese, silicon, chromium and nickel on the solubility of niobium carbide in iron austenite have been studied on iron austenites containing various quantities of these elements with niobium by the method of equilibration with methane-hydrogen mixture gas. Manganese and chromium increased the solubility of NbC remarkably. Nickel increased the solubility of NbC in comparatively low temperature range. But at higher temperature the effect was weak. On the contrary, silicon decreased the solubility of NbC. Such effects are attributed to the effect of each element on the activity of niobium as well as that of carbon.Solubility product of NbC in iron austenite containing manganese, silicon, chromium or nickel is described by the following experimental equations, respectively:(This article is not displayable. Please see full text pdf.)