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Gas nitriding of high vanadium steels: Experiments and simulations
KTH, Superseded Departments, Metallurgy.ORCID iD: 0000-0001-8797-4585
KTH, Superseded Departments, Metallurgy.ORCID iD: 0000-0002-4521-6089
2004 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 35A, no 9, 2799-2802 p.Article in journal (Refereed) Published
Abstract [en]

Four experimental high vanadium alloys were gas nitrided in an ammonia-nitrogen atmosphere. The microstructure and concentration gradients have been investigated by means of several techniques. The nitriding process has been tentatively simulated using the DICTRA software. A precise process simulation does not seem possible at present; the reason for this is discussed. Instead, bounds for the carbon and nitrogen concentration profiles were obtained by applying different simulation conditions.

Place, publisher, year, edition, pages
2004. Vol. 35A, no 9, 2799-2802 p.
Keyword [en]
Ammonia, Carbon, Computer simulation, Computer software, Metallographic microstructure, Nitriding, Nitrogen, Scanning electron microscopy, Vanadium alloys, X ray diffraction analysis
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-12684DOI: 10.1007/s11661-004-0226-1ISI: 000223678000027Scopus ID: 2-s2.0-7044272424OAI: oai:DiVA.org:kth-12684DiVA: diva2:318029
Note
QC 20100506 QC 20110923Available from: 2010-05-06 Created: 2010-05-06 Last updated: 2011-10-17Bibliographically approved
In thesis
1. Internal oxidation processing: New alloys and new simulation techniques
Open this publication in new window or tab >>Internal oxidation processing: New alloys and new simulation techniques
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Nitriding and oxidising treatments of alloys for toolingpurposes have been investigated both experimentally andtheoretically. Specimens prepared by a combination of differentprocessing steps are investigated by light-optical, scanningand transmission electron microscopy and hardness measurments.The bounds of carbon and nitrogen concentration profiles duringnitriding are obtained from simulations using the DICTRA code.As a result, a new processing route to produce oxide-dispersediron-base alloys with large volume fraction of carbides issuggested.

On the theoretical side the methods based on the random walktechnique have been investigated and developed further. The newmethods have been applied to study a vide range of phenomenae.g. internal oxidation, diffusion in inhomogeneous media,phase transformations and formation of porosity due to theKirkendall effect in welded joints. Probability distributionsare introduced to replace random number generators in order toincrease computational efficiency. A general method to simulatediffusional phase transformations in multicomponent systems isdeveloped and applied to ternary alloys.

 

Place, publisher, year, edition, pages
Stockholm: KTH, 2004. x, 33 p.
Keyword
Internal oxidation, nitriding, diffusion, simulation, random walk
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-3715 (URN)91-7283-706-3 (ISBN)
Public defence
2004-03-19, 00:00 (English)
Note
QC 20100506Available from: 2004-03-08 Created: 2004-03-08 Last updated: 2010-05-06Bibliographically approved

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Larsson, Henrik

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