Thermodynamic assessment of liquid Fe-Mn-C system

Abstract

The lattice site ratio model proposed by Chipman describes the activity of the interstitial solutes in the alloy systems in terms of the ratio of filled to unfilled sites as a concentration parameter. Chipman and co-workers successfully applied the model to describe the solution behavior of C and S in the various alloy systems. The meaning of the lattice for the liquid system is not same as that for the solid system, as it does not retain the rigidity of a solid crystalline structure and a long-range order in the atomic arrangement. Still, the liquid system maintains a short-range order with a similar structure to that of the close-packed solid system, and the application of the lattice site ratio model to the liquid system is justified. The present study assessed the thermodynamic properties of the liquid Fe-Mn-C system with the use of the lattice site ratio model. It was found that the solution properties of the ternary Fe-Mn-C system can be represented as linear combinations of those of the constituent binary systems if they are defined in the lattice site ratio model. This is not the case when the solution properties are given in the mole fraction coordinate. The lattice site ratio model reproduced closely the experimentally determined solubility of C and the activities of C and Mn in the Fe-Mn-C system.

Retraction: Representation of Reaction Ability for Structural Units in Fe–Al Binary Melts

“…But after checking previous literatures and phase diagram of Fe-Al binary system, Zhang 11) proposed that five molecules as Fe3Al, FeAl, FeAl2, Fe2Al5 and FeAl6 could exist in FeAl binary melts. Other researchers [12][13][14][15][16][17][24][25][26] have reached the similar viewpoint for metallic melts that molecules can exist in metallic melts besides atoms. Several attempts [24][25][26] can well describe the thermodynamic properties of metallic melts on the concept of ionic or molecular constituents associated with artificial parameters, and most of the regressed artificial parameters were obtained by experimental results.…”

Development of thermophysical calculator for stainless steel casting alloys by using CALPHAD approach

“…Parameters of interaction are selected by comparison of calculated phase diagram for a number of systems and results of known experimental studies. The phase diagrams used in the present study are as follows [2][3][4][5][6][7][8][9][10][11][12][13][14][15] :…”

Analysis of different fatigue damage accumulation theories and damage parameters based on experiments with the steel HC340LA

“…In literature several methods based on energy for estimating the damage and the fatigue life were developed [12][13][14][15]. According to these methods, the damage can be quantified through the dissipated plastic energy ΔW p which is basically proportional to the area of the hysteresis cycles Eq.…”