kth.sePublications
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
Hot Deformation Behaviour and Processing Map of Cast Alloy 825
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-0381-5494
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Process. (Powder metallurgy)ORCID iD: 0000-0002-6339-4612
AB Sandvik Materials Technology.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Process.ORCID iD: 0000-0001-9775-0382
2021 (English)In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024Article in journal (Refereed) Published
Abstract [en]

Alloy 825 is a nickel-based alloy that is commonly used in applications where both high strength and corrosion resistance are required, such as tanks in the chemical, food and petrochemical industries and oil and gas pipelines. Components made from Alloy 825 are often manufactured using hot deformation. However, there is no systematic study to optimise the processing conditions reported in literature. In this study, a processing map for as-cast Alloy 825 is established to maximise the power dissipation efficiency of hot deformation in the temperature range of 950 to 1250 °C at an interval of 50 °C and strain rate range of 0.01s−1 to 10.0s−1 to a true strain of 0.7 using a Gleeble-3500 thermomechanical simulator. The processing conditions are also correlated to the Vickers hardness of the final material, which is also characterised using optical microscopy and scanning electron microscopy, including electron backscattered diffraction. The true stress-true strain curves exhibit peak stresses followed by softening due to occurrence of dynamic recrystallization. The activation energy for plastic flow in the temperature range tested is approximately 450 kJ mol−1, and the value of the stress exponent in the (hyperbolic sine-based) constitutive equation, n=5.0, suggests that the rate-limiting mechanism of deformation is dislocation climb. Increasing deformation temperature led to a lower Vickers hardness in the deformed material, due to increased dynamic recrystallization. Raising the strain rate led to an increase in Vickers hardness in the deformed material due to increased work hardening. The maximum power dissipation efficiency is over 35%, obtained for deformation in the temperature range 1100-1250 °C and a strain rate of 0.01s−1-0.1s−1. These are the optimum conditions for hot working.

Place, publisher, year, edition, pages
Springer Nature , 2021.
Keywords [en]
Alloy 825; Activation energy; Dynamically recrystallised; Grain size; Hot deformation; Stress-strain curve
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-301146DOI: 10.1007/s11665-021-05957-0ISI: 000664426000003Scopus ID: 2-s2.0-85108603380OAI: oai:DiVA.org:kth-301146DiVA, id: diva2:1591051
Note

QC 20210906

Available from: 2021-09-05 Created: 2021-09-05 Last updated: 2022-06-25Bibliographically approved

Open Access in DiVA

fulltext(2055 kB)263 downloads
File information
File name FULLTEXT01.pdfFile size 2055 kBChecksum SHA-512
886162386e80aa0aeaaafa3c35b77451b3b2ca410a1d4637e0d5ed511a9edaed99b156f851abc324d41688c4591aa40e300245a5bd7e6478edb5c4794302a7af
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopushttps://link.springer.com/article/10.1007/s11665-021-05957-0#citeas

Authority records

Al-Saadi, MunirHulme-Smith, ChristopherJönsson, Pär

Search in DiVA

By author/editor
Al-Saadi, MunirHulme-Smith, ChristopherJönsson, Pär
By organisation
Materials Science and EngineeringProcess
In the same journal
Journal of materials engineering and performance (Print)
Metallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar
Total: 263 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 196 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