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Microstructure and Porosity of Laser Welds in Cast Ti-6Al-4V with Addition of Boron
Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden.
University West, Department of Engineering Science, Division of Welding Technology. Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden. (PTW)ORCID iD: 0000-0002-7675-7152
Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden.
2018 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 49A, no 5, p. 1683-1691Article in journal (Refereed) Published
Abstract [en]

Addition of small amounts of boron to cast Ti-6Al-4V alloy has shown to render a finer microstructure and improved mechanical properties. For such an improved alloy to be widely applicable for large aerospace structural components, successful welding of such castings is essential. In the present work, the microstructure and porosity of laser welds in a standard grade cast Ti-6Al-4V alloy as well as two modified alloy versions with different boron concentrations have been investigated. Prior-β grain reconstruction revealed the prior-β grain structure in the weld zones. In fusion zones of the welds, boron was found to refine the grain size significantly and rendered narrow elongated grains. TiB particles in the prior-β grain boundaries in the cast base material restricted grain growth in the heat-affected zone. The TiB particles that existed in the as cast alloys decreased in size in the fusion zones of welds. The hardness in the weld zones was higher than in the base material and boron did not have a significant effect on hardness of the weld zones. The fusion zones were smaller in the boron-modified alloys as compared with Ti-6Al-4V without boron. Computed tomography X-ray investigations of the laser welds showed that pores in the FZ of the boron modified alloys were confined to the lower part of the welds, suggesting that boron addition influences melt pool flow. © 2018 The Author(s)

Place, publisher, year, edition, pages
2018. Vol. 49A, no 5, p. 1683-1691
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-12232DOI: 10.1007/s11661-018-4543-1ISI: 000428844800029Scopus ID: 2-s2.0-85043478044OAI: oai:DiVA.org:hv-12232DiVA, id: diva2:1194694
Note

Funders: NFFP (the Swedish National Program for Aeronautical Technology).

Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2019-05-27Bibliographically approved

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Pederson, Robert

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