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Processing route to an oxide dispersed iron/carbide composite
KTH, Superseded Departments, Materials Science and Engineering.ORCID iD: 0000-0001-8797-4585
KTH, Superseded Departments, Materials Science and Engineering.ORCID iD: 0000-0002-4521-6089
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.

 

Place, publisher, year, edition, pages
2004. Vol. 22, no 4-5, 159-167 p.
Keyword [en]
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: urn:nbn:se:kth:diva-12685DOI: 10.1016/j.ijrmhm.2004.04.002ISI: 000225390800001Scopus ID: 2-s2.0-7944226706OAI: oai:DiVA.org:kth-12685DiVA: diva2:318034
Note
QC 20100506Available from: 2010-05-06 Created: 2010-05-06 Last updated: 2017-12-12Bibliographically 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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