The Thermophysical Properties of Liquid TRIP/TWIP-Steel Alloys Using the Maximum Bubble Pressure Method

Authors


  • This work was financially supported by the German Research Foundation DFG within the Collaborative Research Centre SFB 799 TRIP-Matrix-Composite at the Institute of Iron and Steel Technology, Technical University Bergakademie Freiberg, which is hereby gratefully acknowledged. Mr. M. Hartig is thanked for experimental measurements. In addition, the authors would like to thank Prof. S. Seetharaman for his fruitful comments on the final manuscript.

Abstract

The thermophysical properties of liquid Cr-Mn-Ni steel alloys (16 wt% Cr, 7 wt% Mn, and 3–9 wt% Ni) are investigated using the maximum bubble pressure method in which the manganese evaporation and change in chemical composition is very low after experimental trial. The surface tension of copper was measured as reference and experimental σ is in the range of literature values. It is shown that for AISI 304 austenitic steel the surface tension decreased by an increase of oxygen concentration in steel composition. For Cr-Ni and Cr-Mn-Ni steels, the temperature coefficient math formula is positive which is explained by sulfur steel concentrations larger 50 mass ppm. A slight influence of nickel to the surface tension of Cr-Mn-Ni steels was experimentally observed where σ was lowered by rising weight percentage of nickel.

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