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Thermodynamics of phosphorus in carbon‐saturated manganese‐based alloys
Author(s) -
Shim Sang Chul,
Morita Kazuki,
Sano Nobuo
Publication year - 1994
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199401205
Subject(s) - chemistry , manganese , phosphorus , silicon , phosphor , alloy , carbon fibers , activity coefficient , saturation (graph theory) , analytical chemistry (journal) , inorganic chemistry , metallurgy , nuclear chemistry , materials science , environmental chemistry , aqueous solution , organic chemistry , mathematics , optoelectronics , combinatorics , composite number , composite material
The interaction coefficient of phosphorus with silicon in a Mn‐Si‐C sat alloy has been measured at 1573 K, equilibrating CaC 2 , C, and Ca 3 P 2 in a quartz capsule to keep the phosphorus partial pressure as high as 33.7 Pa. The activity coefficient of phosphorus in the melts increases with increasing silicon content, and the interaction parameter between silicon and phosphorus in the melts at carbon saturation ε Si P , C sat was found to be 10.4. The activity of phosphorus in a carbon‐saturated Fe‐Mn alloy was also determined at temperatures of 1573 to 1673 K using a chemical equilibration technique between BaO‐BaF 2 fluxes and Fe‐Mn‐C sat with manganese mass contents ranging from 0 to 85.3 %. A slight decrease in the activity coefficient of phosphorus in Fe‐Mn‐C sat alloys was observed with increasing manganese content, as a reflection of a stronger interaction between manganese and phosphorus than that between iron and phosphorus. The value for e Mn P,Csat was found to be ‐0.0029 between 1573 and 1673 K.