Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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
Electron Beam Melting of Alloy 718: Influence of post-treatment on the microstructure and mechanical properties
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
2019 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesisAlternative title
Elektronstrålsmältning av legering 718 : Efterbehandling påverkan på mikrostrukturen och mekaniska egenskaper (Swedish)
Abstract [en]

Additive manufacturing or 3D printing offers the chance to create complex 3D geometries for specific goals in aerospace, energy, automotive, and medical applications. This type of printing enables the manufacturing of elements that are either economically unfeasible or difficult to manufacture through the usual processes, along with low material waste and decreased tooling requirements. Despite these advantages, the mechanical characteristics of fabricated components remain challenging due to the anisotropic behavior of AM specific microstructure.

The objectives of this thesis were to investigate the microstructure of Alloy 718 manufactured through electron beam melting (EBM), under both as-built and post-treated conditions. In this study, samples were subjected to hot isostatic pressing (HIP) and HIP + solution treatment aging (STA) post-treatments. All samples were produced in the vertical direction in rectangular solid geometry. The studies involved grain width measurements, phases, and defects present, and their respective distribution, also microhardness tests.

The result demonstrates that microstructures were affected by the thermal history, especially concerning temperature and cooling rates. The HIP treatment results in a considerable decrease in the defects amount and dissolution of γ" phase. Consequently, a reduction in hardness for the HIP condition was observed. Furthermore, post-treatments did not affect the inclusions and NbC because of their high solvus temperature. For HIP+STA treatment, a slight rise in hardness value was recorded compared with the as-built condition, which is attributed to re-precipitation of γ" during the two-step aging process whereas grain width remains steady for all conditions in the hatch region.

Place, publisher, year, edition, pages
2019. , p. 35
Keywords [en]
Electron beam melting, additive manufacturing, post-treatment, alloy 718, microstructure
Keywords [sv]
Elektronstrålsmältning, additiv tillverkning, efterbehandling, legering 718, mikrostrukturer
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
URN: urn:nbn:se:hv:diva-14685Local ID: EXP800OAI: oai:DiVA.org:hv-14685DiVA, id: diva2:1368906
Subject / course
Mechanical engineering
Educational program
Produktionsteknik, magister
Supervisors
Examiners
Available from: 2019-11-18 Created: 2019-11-08 Last updated: 2020-01-29Bibliographically approved

Open Access in DiVA

No full text in DiVA

By organisation
Division of Subtractive and Additive Manufacturing
Production Engineering, Human Work Science and Ergonomics

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 47 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • 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