Prediction of Phase Composition and Nitrogen Concentration During the Nitriding Process in Low-Alloy Steel

A diffusion/transformation coupled model has been developed which combines finite difference (FD) model with a phenomenological model. The composition of the different iron-nitrogen(Fe-N) hardening phase can be regard as a function of nitriding time and nitrogen concentration. The diffusion model an...

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Published inMaterials research (São Carlos, São Paulo, Brazil) Vol. 19; no. 2; pp. 353 - 359
Main Authors Deng, Xiaohu, Ju, Dongying
Format Journal Article
LanguageEnglish
Portuguese
Spanish
Published ABM, ABC, ABPol 01.04.2016
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects
Chromium molybdenum steels
Computer simulation
Concentration (composition)
Constraining
Diffusion
ENGINEERING, CHEMICAL
Fe-N phase composition
Low alloy steels
Low-alloy steel
MATERIALS SCIENCE, MULTIDISCIPLINARY
Mathematical models
METALLURGY & METALLURGICAL ENGINEERING
Modeling
Nitriding
Nitrogen concentration
Transformations
Low-alloy steel
Nitriding
Nitrogen concentration
Fe-N phase composition
Modeling
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Summary:A diffusion/transformation coupled model has been developed which combines finite difference (FD) model with a phenomenological model. The composition of the different iron-nitrogen(Fe-N) hardening phase can be regard as a function of nitriding time and nitrogen concentration. The diffusion model and transformation model are linked by the limiting nitrogen solubilities and the effective diffusion coefficients. The effect of alloy elements (Cr, Mo, Mn, V, Ni etc.) is considered by introducing an alloy coefficient for limiting nitrogen solubilities and diffusion coefficient. The diffusion/transformation model can predict nitrogen concentration, phase composition and hardness distribution. The model is employed to simulate the nitriding process of SCr420H low-alloy steels. The simulated nitrogen concentration and hardness profiles are consistent with the measured ones. In addition, the predicted depth distributions of iron-nitrogen phase agree well with the available experimental results. Therefore, the comparison shows the reliability of the coupled model. It can be applied to improve the nitriding process parameters.
Bibliography:ObjectType-Article-1
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ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-MR-2015-0137