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Internal oxidation processing: New alloys and new simulation techniques
KTH, Superseded Departments, Materials Science and Engineering.ORCID iD: 0000-0001-8797-4585
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 [en]
Internal oxidation, nitriding, diffusion, simulation, random walk
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-3715ISBN: 91-7283-706-3 (print)OAI: oai:DiVA.org:kth-3715DiVA: diva2:9555
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
List of papers
1. A Random Walk Approach Towards 3D-Modelling of Nucleation, Growth and Coarsening of Precipitates in Steel
Open this publication in new window or tab >>A Random Walk Approach Towards 3D-Modelling of Nucleation, Growth and Coarsening of Precipitates in Steel
2003 (English)In: IF Steels 2003: international forum for the properties and application of IF steels / [ed] Takechi, H, Iron and Steel Institute of Japan , 2003, 268- p.Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Iron and Steel Institute of Japan, 2003
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-12688 (URN)9784930980366 (ISBN)
Conference
International Forum for the Properties and Application of IF Steels, IF Steels 2003, May 12 to 14, 2003, Arcadia Ichigaya, Tokyo, Japan
Note

QC 20100506

Available from: 2010-05-06 Created: 2010-05-06 Last updated: 2012-08-23Bibliographically approved
2. Processing route to an oxide dispersed iron/carbide composite
Open this publication in new window or tab >>Processing route to an oxide dispersed iron/carbide composite
2004 (English)In: International journal of refractory metals & hard materials, ISSN 0958-0611, E-ISSN 2213-3917, Vol. 22, no 4-5, 159-167 p.Article in journal (Refereed) Published
Abstract [en]

A new combination of techniques which should make it possible to produce oxide dispersed alloys by internal oxidation is suggested. The new technique has been used to produce a prototype alloy with a ferritic matrix containing fine (10-20 nm) oxides as well as a large volume fraction of carbides (about 40%). The microstructure indicates that it would be possible to produce an iron-base hard material with improved hot hardness. The technique is based upon an intermetallic starting material and utilises powder metallurgy and attrition ball milling.

 

Keyword
Carbides, Internal oxidation, Iron, Oxide dispersion, Ball milling, Carbides, Dispersions, Intermetallics, Internal oxidation, Iron, Microhardness, Microstructure, Powder metallurgy, Volume fraction
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-12685 (URN)10.1016/j.ijrmhm.2004.04.002 (DOI)000225390800001 ()2-s2.0-7944226706 (Scopus ID)
Note
QC 20100506Available from: 2010-05-06 Created: 2010-05-06 Last updated: 2017-12-12Bibliographically approved
3. A cellular automata treatment of internal oxidation
Open this publication in new window or tab >>A cellular automata treatment of internal oxidation
2000 (English)In: Proc. Int. Conf. Mass and Charge Transport in Inorganic Materials: Fundamentals to Devices, Lido di Jesolo, Italy, 2000 / [ed] P Vincenzini, V Buscaglia, Faenza (Ravenna): Techna , 2000, 647-652 p.Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Faenza (Ravenna): Techna, 2000
Identifiers
urn:nbn:se:kth:diva-12687 (URN)8886538308 (ISBN)
Note
QC 20100506Available from: 2010-05-06 Created: 2010-05-06 Last updated: 2010-05-06Bibliographically approved
4. Gas nitriding of high vanadium steels: Experiments and simulations
Open this publication in new window or tab >>Gas nitriding of high vanadium steels: Experiments and simulations
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.

Keyword
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:nbn:se:kth:diva-12684 (URN)10.1007/s11661-004-0226-1 (DOI)000223678000027 ()2-s2.0-7044272424 (Scopus ID)
Note
QC 20100506 QC 20110923Available from: 2010-05-06 Created: 2010-05-06 Last updated: 2017-12-12Bibliographically approved
5. A random-walk investigation of the diffusive properties of inhomogenous media
Open this publication in new window or tab >>A random-walk investigation of the diffusive properties of inhomogenous media
(English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550Article in journal (Refereed) Submitted
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-12686 (URN)
Note
QS 20120327Available from: 2010-05-06 Created: 2010-05-06 Last updated: 2017-12-12Bibliographically approved
6. A random-walk approach to diffusion controlled growth
Open this publication in new window or tab >>A random-walk approach to diffusion controlled growth
2003 (English)In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 49, no 6, 521-526 p.Article in journal (Refereed) Published
Abstract [en]

The new method does not require formulation of any special conditions at the moving phase interface. Although only binary systems are treated at present an extension to any number of components seems straightforward. A good agreement with conventional front tracking techniques (DICTRA) is found.

Keyword
Diffusion, Phase transformations, Simulation, Binary alloys, Computer simulation, Diffusion in solids, Partial differential equations, Phase interfaces, Phase transitions
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-12689 (URN)10.1016/S1359-6462(03)00364-6 (DOI)000184265600007 ()
Note
QC 20100506Available from: 2010-05-06 Created: 2010-05-06 Last updated: 2017-12-12Bibliographically approved
7. A random-walk approach to diffusion controlled growth II: A distribution function solution
Open this publication in new window or tab >>A random-walk approach to diffusion controlled growth II: A distribution function solution
2004 (English)In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 51, no 2, 137-140 p.Article in journal (Refereed) Published
Abstract [en]

Earlier work on simulations of diffusion controlled transformations based on a random-walk technique is extended; a random-walk simulation of a transformation in a ternary system and a new method based on distribution functions are presented. As before, no special assumption regarding the state of the phase interface is required.

Keyword
Interface migration, Phase transformations, Random-walk, Simulation, Boundary conditions, Computer simulation, Differential equations, Diffusion, Normal distribution, Parameter estimation, Probability distributions, Problem solving
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-12691 (URN)10.1016/j.scriptamat.2004.03.038 (DOI)000221577300011 ()2-s2.0-2342580712 (Scopus ID)
Note
QC 20100506Available from: 2010-05-06 Created: 2010-05-06 Last updated: 2017-12-12Bibliographically approved
8. Prediction of Kirkendall shift and porosity in binary and ternary diffusion couples
Open this publication in new window or tab >>Prediction of Kirkendall shift and porosity in binary and ternary diffusion couples
2004 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 52, no 15, 4695-4703 p.Article in journal (Refereed) Published
Abstract [en]

Computer simulations are applied to simulate the Kirkendall shift and porosity in binary and ternary alloys. Three different computational methods, based on different assumptions, are used together with assessed thermodynamic and kinetic data. The simulation results show good agreement compared with experimental data.

Keyword
Diffusion, Kinetics, Kirkendall effect, Modelling, Simulation, Concentration (process), Crystal lattices, Diffusion, Heat treatment, Porosity, Reaction kinetics, Ternary systems, Thermodynamics
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-12690 (URN)10.1016/j.actamat.2004.06.039 (DOI)000223793900028 ()2-s2.0-4043050123 (Scopus ID)
Note
QC 20100506 QC 20110916Available from: 2010-05-06 Created: 2010-05-06 Last updated: 2017-12-12Bibliographically approved

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