Viscosity of Fe–Mn–С Melts

Surface Tension of Fe–Mn–C Melts

“…It was found that at a certain temperature T* reached for each composition, the surface entropy η changes sign from negative to positive, which is indirect evidence for a structural transition (LLT) associated with the destruction of the microheterogeneous state. Table 2 shows the values of the specific surface entropy η over a certain σ = η d dT 2) at which η changes sign and the microheterogeneous state of the Fe-(5.0-25.0) wt % Mn-(0.4-2.2) wt % C melts decomposes agree with the analogous values previously determined by the authors from the anomalies of the temperature dependences of kinematic viscosity and electrical resistivity [5,6].…”

“…Earlier, the authors found anomalies in the temperature dependences of the kinematic viscosity and specific electrical resistivity of the Fe-(5.0-25.0) wt % Mn-(0.4-2.2) wt % C melts, which are interpreted as evidence for the irreversible destruction of microheterogeneity [5,6]. The temperatures T* were determined at which the heating leads to a destruction of the microheterogeneous state of the Fe-Mn-C melt of a definite chemical composition [5,6]. The authors also found anomalies in the temperature dependences of the kinematic viscosity, specific electrical resistivity, and surface tension of liquid Hadfield steel (Fe-12 wt % Mn-1 wt % C), which were interpreted as evidence for the irreversible destruction of microheterogeneity; the temperature T* = 1770 K was determined at which the heating leads to a destruction of the microheterogeneous state of the melt [7].…”

“…After the irreversible destruction of the microheterogeneous state, the melt passes into the state of true solution, and the conditions of its crystallization change, leading to changes in the microstructure, crystal structure, and mechanical properties of the ingot [4]. Earlier, the authors found anomalies in the temperature dependences of the kinematic viscosity and specific electrical resistivity of the Fe-(5.0-25.0) wt % Mn-(0.4-2.2) wt % C melts, which are interpreted as evidence for the irreversible destruction of microheterogeneity [5,6]. The temperatures T* were determined at which the heating leads to a destruction of the microheterogeneous state of the Fe-Mn-C melt of a definite chemical composition [5,6].…”

“…BeO substrates were used. The working chamber was preliminarily evacuated to 0.001 Pa. Then helium was let in to a pressure of ~10 5 Pa. The samples were kept in a chamber with an inert medium for 5-8 min at the melting temperature.…”

On Spontaneous Dispersion as a Cause of Microstratification of Metal Melts

“…This result (13), as well as expression (12) obtained above, is consistent with the ideas of M. Volmer and P.A. Rebinder [17].…”