Experimental Study of High Temperature Phase Equilibria in the Iron-Rich Part of the Fe-P and Fe-C-P Systems

• DOI: 10.1007/s11661-020-05912-z
• Publication Date: 2020-07-23T22:02:15Z
• Authors: Michael Bernhard; Peter Presoly; Nora Fuchs; Christian Bernhard; Youn-Bae Kang
• Keywords: 1ST-PRINCIPLES; CARBON CONTENT; STEEL; CONCENTRIC SOLIDIFICATION; 0211 other engineering and technologies; 02 engineering and technology; DIAGRAM; SOLUBILITY; 7. Clean energy; THERMODYNAMIC ASSESSMENT; PHOSPHORUS; 0205 materials engineering; CRYSTAL-STRUCTURE; TRANSITION

Abstract During the solidification of steel, phosphorus strongly segregates in interdendritic liquid phase. In continuous casting process, even low levels P may have a detrimental effect on final product quality. However, is partly added up to 0.10 wt pct improve mechanical properties advanced steel grades nowadays, e.g., High-Strength Interstitial-Free (HSIF). To provide new experimental data for development thermodynamic databases and models alloyed grades, phase equilibria Fe-P Fe-C-P key systems were studied 1550 °C using differential scanning calorimetry (DSC) high temperature laser confocal microscopy (HT-LSCM). Special focus was placed solid/liquid equilibrium temperatures Fe-rich part binary system between 0.025 9 P. ternary system, three isoplethal sections with mass pct. P, 0.20 C constant percent ratio P/C 2 investigated. latter section, HT-LSCM observations linked DSC signals optically identify present stabilities. Particularly at [pct P] < 1, significant differences performed measurements calculated assessments from literature identified. all sections, experiments indicate less influence hypo-peritectic range compared calculations.