Solubility of MnS in Fe-Ni Alloys as Determined by In-situ Observation of Precipitation of MnS with a Confocal Scanning Laser Microscope
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Solubility of MnS in Fe-Ni alloys has been investigated by "<I>in-situ</I>" observation with a confocal scanning laser microscope of specimens with various Mn, S and Ni contents which were heated and cooled in an infrared image furnace. Precipitation behavior of MnS at the surface of the specimens on cooling was monitored on a CRT and was recorded on videotape. Most MnS precipitates are found to form on alumina inclusion particles and grow in triangular (pyramidal) or rod-like shape. From precipitation temperatures obtained by the "<I>in-situ</I>" observation, the equilibrium constant of the reaction MnS<sub>←</sub><sup>→</sup>Mn+S is determined as log<I>K</I>=log[%Mn][%S] <I>f</I> <sub>S</sub><sup>Mn</sup>= –9420/<I>T</I>+3.67, at <I>T</I>=1329–1493K for Fe–42mass%Ni alloy. The <I>K</I> value for γ-Fe at 1438K is in good agreement with that by Turkdogan <I>et al.</I>, and Ni is found to increase the solubility of MnS.
- Transactions of the Iron and Steel Institute of Japan
Transactions of the Iron and Steel Institute of Japan 38(4), 317-323, 1998-04-15
The Iron and Steel Institute of Japan