MatCalc version: 5.40 - …
Author: E. Kozeschnik
Created: 2011-07-06
Revisions:

This example provides a set of MatCalc scripts for simulation of AlN precipitation in steel. This study was published in ref.¹⁾ The main feature of these examples is the simultaneous precipitation of AlN on dislocations and grain boundaries. The simulations make use of volumetric misfit data for AlN in the nucleation stage as well as the special diffusion geometry for grain boundary precipitation developed in ref.²⁾

1. TP - Grain boundary versus random precipitation
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Consider a microalloyed steel during continuous casting. Even without employing kinetic simulation models, predictions can be made on the microsegregation state after solidification, the existence, type and amount of primary precipitates and equilibrium phases simply employing thermodynamic equilibrium calculations. In the first part of this example, classical equilibrium calculations are discussed.

The table summarizes the chemical composition of the steel used in this analysis, given in wt%.

For simulation, the 'mc_fe' database is used, with the elements and phases selection as shown in the dialog below:

P5-1 - AlN precipitation in austenite (Leslie et al. Trans. ASM 46 (1954) 1470-97)

P5-2 - AlN precipitation in ferrite (V. Massardieret al. Mat. Sci. Eng. A 355 (2003) 299-310)

P5-3 - Concurrent precipitation of VN and AlN (P. König et al. Archiv für das Eisenhüttenwesen, 32(8) (1961) 541-556)

P5-4 - TTP diagram for AlN precipitation in austenite (R. Radis et al. Model. Simul. Mater. Sci. Eng. 18 (2010) 055003, 16 pages)