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Modelling mechanical properties by analysing datasets of commercial alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Commercial alloys are continuously developed to improve their performance. Therefore it is important to develop new optimisation software, which could be used in development of new materials or in materials selection. In this study the mechanical properties which are important in materials selection in mechanical design are investigated. Two types of materials are analysed, aluminium alloys and stainless steels but focus will be on the aluminium alloys.

Thermodynamic analysis has been used to evaluate the effect of the microstructure. Solid solution hardening has been successfully modelled for both aluminium alloys and stainless steels and follows the theories by Labusch and Nabarro. The precipitation hardening is most dominant for the hardenable aluminium alloys, but the non-hardenable alloys also increase their strength from precipitation hardening. The non-hardenable alloys are divided into tempers, which differ in the amount of strain hardening. This has also been modelled successfully.

Combining these fundamental results with multiple regression, models for mechanical properties have been created. Separate models are developed for wrought aluminium alloys and stainless steels. For the aluminium alloys this includes the solid solution hardening and the precipitation hardening. For the stainless steels the thickness, nitrogen content and ferrite content are included together with the solid solution hardening.

Place, publisher, year, edition, pages
Stockholm: KTH , 2007. , 48 p.
Keyword [en]
Aluminium alloys, modelling, material optimisation, mechanical properties, solid solution hardening, precipitation hardening, work-hardening, multiple regression, stainless steel
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-4527ISBN: 978-91-7178-803-0 (print)OAI: oai:DiVA.org:kth-4527DiVA: diva2:12682
Presentation
2007-11-30, Konferensrummet 4tr, Materialvetenskap, KTH, Brinellvägen 23, Stockholm, 10:30
Opponent
Supervisors
Note
QC 20101122Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2010-11-22Bibliographically approved
List of papers
1. Modelling solid solution hardening in stainless steels
Open this publication in new window or tab >>Modelling solid solution hardening in stainless steels
2006 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 415, no 1-2, 66-71 p.Article in journal (Refereed) Published
Abstract [en]

The solid solution hardening of stainless steels is studied by using the Labusch-Nabarro relation. Models are evaluated in order to predict the mechanical properties from chemical composition, solution hardening misfit parameters, grain size, ferrite content and product thickness. A data source of six grades of steels is used for the modelling. Both austenitic and duplex stainless steels are covered including more than 1100 batches, which are subjected to multiple regression analyses. The models are compared with earlier studies and can be used as tools in material optimisation.

Keyword
stainless steel, material optimisation, solution hardening, mechanical properties, multiple regression
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-5737 (URN)10.1016/j.msea.2005.09.031 (DOI)000234270400009 ()2-s2.0-29244466485 (Scopus ID)
Note
QC 20100920Available from: 2006-05-15 Created: 2006-05-15 Last updated: 2017-12-14Bibliographically approved
2. Modelling mechanical properties for non-hardenable aluminium alloys
Open this publication in new window or tab >>Modelling mechanical properties for non-hardenable aluminium alloys
2007 (English)In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 41, no 1, 86-95 p.Article in journal (Refereed) Published
Abstract [en]

A range of mechanical properties have been investigated for non-hardenable aluminium alloys. Commercially pure aluminium, Al-Mn, and Al-Mg alloys in five tempers have been covered. In the models solid solution, particle strengthening and work hardening have been taken into account. Ab-initio calculations of the size and modulus misfit parameters that are needed in the solid solution hardening model have been performed. In accordance with the Labusch-Nabarro model, the solid solution hardening has been shown to be proportional to εL4 / 3 c2 / 3, where εL is the Fleischer misfit parameter and c the solute concentration. A cold work parameter H has been introduced. The contribution from cold working is linear in H for the tensile strength and fatigue endurance, whereas the contributions to the yield strength and to the hardness are proportional to H0.5.

Keyword
aluminium alloys, material optimisation, mechanical properties, solid solution, work hardening, particle strengthening, multiple regression
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-7601 (URN)10.1016/j.commatsci.2007.03.013 (DOI)000251041400011 ()2-s2.0-35348819299 (Scopus ID)
Note
QC 20100923Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2017-12-14Bibliographically approved
3. One parameter model for strength properties of hardenable aluminium alloys
Open this publication in new window or tab >>One parameter model for strength properties of hardenable aluminium alloys
2008 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 29, no 8, 1540-1548 p.Article in journal (Refereed) Published
Abstract [en]

Models for strength properties are proposed for commercially aluminium alloys. The alloy group investigated are the hardenable alloys from the 2000 (Al-Cu and Al-Cu-Mg), 6000 (Al-Mg-Si) and 7000 (Al-Zn-Mg) series. The same model for solid solution hardening that has successfully been applied to non-hardenable alloys has been used. For precipitation hardening, particle cutting and the Orowan mechanism have been considered. The same basic model is used for all strength properties. It is demonstrated that with one fitting parameter for each property, a representation with reasonable accuracy can be obtained that is applicable to a wide range of alloys. Such models are useful in materials optimisation and selection.

Keyword
Material optimisation, Mechanical properties, Modelling, Particle strengthening, Solid solution hardening, Wrought aluminium alloys
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-7602 (URN)10.1016/j.matdes.2008.02.001 (DOI)000256895300007 ()2-s2.0-43049085490 (Scopus ID)
Note
QC 20100924. Uppdaterad från Submitted till Published (20100924).Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2017-12-14Bibliographically approved

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