Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Intermetallic compounds in friction stirred lap joints between AA5754/galvanised ultra-high strength steel
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
Swerea KIMAB.
2016 (English)In: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, Vol. 21, no 8, 653-659 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents results of joining of AA5754 and DP800 based on the friction stir welding process. Joints were produced by the tool made of H13 tool steel which was allowed to penetrate through the aluminium sheet until reaching the surface of steel sheet without penetrating into it. This approach is an economic and robust way to operate the dissimilar welding process without excessive tool cost. Bonding was achieved by interfacial diffusion reactions between aluminium and iron with a formation of intermetallic compounds. The formation of brittle intermetallic compounds at the interface between the materials was studied. Three intermetallic phases were found at the interface including Al13Fe4, Al5Fe2 and Fe3Zn10. A range of process parameters was identified with a thickness of the intermetallic layers around 2 mu m. Shear fracture failure mode was observed under overlap loading. The mechanisms of formation of the joints and factors controlling the strength were discussed.

Place, publisher, year, edition, pages
Taylor & Francis, 2016. Vol. 21, no 8, 653-659 p.
Keyword [en]
Friction stir welding, Aluminium, Steel, Intermetallics, Diffusion
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-193276DOI: 10.1080/13621718.2016.1163878ISI: 000382208600007Scopus ID: 2-s2.0-84978488343OAI: oai:DiVA.org:kth-193276DiVA: diva2:1033558
Note

QC 20161007

Available from: 2016-10-07 Created: 2016-09-30 Last updated: 2017-05-19Bibliographically approved
In thesis
1. Dissimilar joining of aluminium to ultra-high strength steels by friction stir welding
Open this publication in new window or tab >>Dissimilar joining of aluminium to ultra-high strength steels by friction stir welding
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Multi-material structures are increasingly used in vehicle bodies to reduce weight of cars. The use of these lightweight structures is driven by requirements to improve fuel economy and reduce CO2 emissions. The automotive industry has replaced conventional steel components by lighter metals such as aluminium alloy. This is done together with cutting weight of structures using more advanced strength steels. However, sound joining is still difficult to achieve due to differences in chemical and thermal properties.

 

This research aims to develop a new innovative welding technique for joining aluminium alloy to ultra-high strength steels. The technique is based on friction stir welding process while the non-consumable tool is made of an ordinary tool steel. Welding was done by penetrating the rotating tool from the aluminium side without penetrating into the steel surface. One grade of Al-Mg aluminium alloy was welded to ultra-high strength steels under lap joint configuration. Different types of steel surface coatings including uncoated, hot-dipped galvanised and electrogalvanised coating have been studied in order to investigate the influence of zinc on the joint properties. The correlation among welding parameters, microstructures, intermetallic formation and mechanical properties are demonstrated in this thesis.  Results have shown that friction stir welding can deliver fully strong joints between aluminium alloy and ultra-high strength steels. Two intermetallic phases, Al5Fe2 and Al13Fe4, were formed at the interface of Al to Fe regardless of surface coating conditions. The presence of zinc can improve joint strength especially at low heat input welding due to an increased atomic bonding at Al-Fe interface. The formation of intermetallic phases as well as their characteristics has been demonstrated in this thesis. The proposed welding mechanisms are given based on metallography investigations and related literature.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. 39 p.
Series
TRITA-IIP, ISSN 1650-1888
Keyword
Aluminium alloy, high strength steel, intermetallic, friction stir welding, dissimilar joining
National Category
Manufacturing, Surface and Joining Technology
Research subject
SRA - Production
Identifiers
urn:nbn:se:kth:diva-207356 (URN)978-91-7729-390-3 (ISBN)
Public defence
2017-06-09, M311, Brinellvägen 68, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
XPRES - Initiative for excellence in production research
Note

QC 20170519

Available from: 2017-05-19 Created: 2017-05-19 Last updated: 2017-05-19Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Ratanathavorn, WallopMelander, Arne
By organisation
Production Engineering
In the same journal
Science and technology of welding and joining
Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 6 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf