Title

Simulation Of The Ferritic Nitriding Process

Keywords

AISI 4140; Calphad; Lehrer diagram; Nitriding process

Abstract

The Lehrer diagram of pure iron is widely used to select the nitriding process of alloy steels. In the present work, the Lehrer diagram of AISI 4140 was determined for the first time by computational thermodynamics. It is demonstrated that the Lehrer diagram of AISI 4140 differs from that of pure iron significantly. Nitriding experiments for AISI 4140 were also carried out to verify the predictions from computational thermodynamics. The scanning electron microscopy results show the existence of two phases in the compound layer and the transmission electron microscopy results at the interface between the compound layer and the diffusion zone verified the coexistence of γ'- Fe4N and e{open}-Fe2-3(C,N) phases. These experimental results agree well to the customised Lehrer diagram of AISI 4140 constructed from computational thermodynamics. © 2011 IHTSE Partnership.

Publication Date

9-1-2011

Publication Title

International Heat Treatment and Surface Engineering

Volume

5

Issue

3

Number of Pages

122-126

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1179/174951411X12956208225186

Socpus ID

80053376110 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/80053376110

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