TY - JFULL AU - L. Torchane PY - 2014/1/ TI - Gas-Solid Nitrocarburizing of Steels: Kinetic Modeling and Experimental Validation T2 - International Journal of Mechanical and Mechatronics Engineering SP - 1457 EP - 1463 VL - 8 SN - 1307-6892 UR - https://publications.waset.org/pdf/10000182 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 96, 2014 N2 - The study is devoted to define the optimal conditions for the nitriding of pure iron at atmospheric pressure by using NH3- Ar-C3H8 gas mixtures. After studying the mechanisms of phase formation and mass transfer at the gas-solid interface, a mathematical model is developed in order to predict the nitrogen transfer rate in the solid, the ε-carbonitride layer growth rate and the nitrogen and carbon concentration profiles. In order to validate the model and to show its possibilities, it is compared with thermogravimetric experiments, analyses and metallurgical observations (X-ray diffraction, optical microscopy and electron microprobe analysis). Results obtained allow us to demonstrate the sound correlation between the experimental results and the theoretical predictions. ER -