Title

Intelligent Heat Treating: Simulation Of The Ferritic Nitriding Process - Database Development

Keywords

γ′ - Fe N 4; ε - Fe (C 2-3; Diffusion; N); Nitriding; Phase diagrams; Process simulation

Abstract

Heat treaters need an effective simulation tool to predict the nitriding performance for a wide variety of steels. This tool is needed not only to predict the hardness and nitrogen concentration profiles as a function of process parameters but also to optimize the process in terms of cycle time and cost. To develop a tool, it is necessary to predict the phase evolution in the hardened case during nitriding. In the present work, thermodynamic calculations and experimental work have been completed to help determine the effects of process parameters (i.e. temperature and nitriding potential as well as the starting steel microstructure and composition) on the nitriding process. The thermodynamic calculations show that γ′ - Fe4N should coexist with ε - Fe2-3(C, N) phase in the compound layer, while only Fe4N is found in the compound layer by X-ray diffraction. However, the SEM results show the existence of two phases in the compound layer and the TEM results at the interface between the compound layer and the diffusion zone verify the coexistence of γ′ - Fe4N and s - Fe2-3(C, N) phases. The nitriding characteristics were also examined in terms of weight gain, microhardness, and nitrogen concentration profiles. These data will be used to develop the simulation tool to optimize and control the nitriding process.

Publication Date

11-30-2010

Publication Title

AIST Steel Properties and Applications Conference Proceedings - Combined with MS and T'10, Materials Science and Technology 2010

Number of Pages

1-12

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

78649373730 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/78649373730

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