Computational and Experimental Analysis of Carbo‐Nitride Precipitation in Tempered Martensite

Abstract

The present work describes the analysis of carbo‐nitride precipitation kinetics in tempered martensite of Nb–Ti‐microalloyed steel with a carbon content of 0.3 wt%. Based on the information obtained from transmission electron microscopy and scanning electron microscopy, a computational simulation procedure is developed within the software package MatCalc, which is capable of describing the experimental results in terms of the number density, composition, and type of precipitate phases. No explicit fitting parameters are used in the computer simulation. The input data is entirely based on independent physical or microstructural parameters. To determine the chemical composition and type of precipitates, energy dispersive X‐ray spectroscopy and selected area electron diffraction are utilized. The simulation results and the experimentally obtained information are in good agreement.

Kinetics Simulation of MnS Precipitation in Electrical Steel

“…The precipitation kinetics at grain boundaries is evaluated with the model developed in ref . Details on the application of the approach to problems in precipitation kinetics in steel have been reported repeatedly and the interested reader is referred to, e.g., refs …”

“…[22] Details on the application of the approach to problems in precipitation kinetics in steel have been reported repeatedly and the interested reader is referred to, e.g., refs. [23][24][25] The main sources of experimental data for MnS precipitation are reported for three electrical steel grades, [1,7,26] where the growth and coarsening behavior of MnS during hot deformation is investigated. Prior to application of the load, each specimen was solutiontreated at 1300 8C for 30 min to dissolve the sulfides present in the as-received plates.…”

Impact of Surface Structure Control Cooling During Continuous Casting on Hot Ductility of Microalloyed Steel

“…Microsegregation in the present complex multi‐component alloy is studied in the framework of the Scheil‐Gulliver model. In the analysis, the Scheil‐Gulliver module of MatCalc is used to predict primary precipitates during the continuous casting process . In the calculation, back diffusion of carbon and nitrogen is considered as well as the peritectic reaction.…”

“…In the analysis, the Scheil-Gulliver module [25] of MatCalc is used to predict primary precipitates during the continuous casting process. [26] In the calculation, back diffusion of carbon and nitrogen is considered as well as the peritectic reaction. In the kinetics simulation, (Ti,Nb),(C,N) precipitates are assumed to nucleate on grain boundaries and dislocations.…”

“…All other parameters are left on their default values as suggested by the MatCalc software. Further details of the simulation setup and strategy have been described in detail by Zamberger et al [26]…”