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
Comparing the deformation-induced martensitic transformation with the athermal martensitic transformation in Fe-Cr-Ni alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. KTH Royal institute of technology.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-1102-4342
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The microstructure of martensite formed athermally or via deformation in Fe-Cr-Ni alloys with different austenite (γ) stability has been investigated using microscopy. Two different types of microstructures, viz. blocky and banded structure, are observed after athermal and deformation-induced martensitic transformation (AMT and DIMT, respectively). The blocky structure form during AMT or DIMT if the stability of γ is low. In both these cases, there is a significant chemical driving force for the transformation from γ to α’-martensite (α’), and if it is not hindered by e.g. planar defects it can grow uninhibited into a blocky morphology without the necessity to nucleate new crystallographic variants to accommodate the transformation strains. On the other hand, the banded structure is due to the formation of ε-martensite (ε) during AMT, or the wider concept shear bands in the case of DIMT. The shear bands, and in particular ε, lower the nucleation barrier for α’ that forms within individual shear bands if the stability of γ is low. Neighbouring α’ units predominantly have a twin-related orientation relationship to accommodate the transformation strains. With increasing γ stability during DIMT, variant selection becomes pronounced with preferred formation of variants favourable oriented with respect to the applied stress/strain field. The formation of α’ at individual shear bands is also rare, since no ε is present and instead α’ forms at the intersection of shear bands for more stable γ. In conclusion, AMT and DIMT for low γ stability lead to similar microstructures, whereas the DIMT microstructure for high γ stability is distinct.

National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-228048OAI: oai:DiVA.org:kth-228048DiVA, id: diva2:1206410
Note

QC 20180522

Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-06-12Bibliographically approved
In thesis
1. Martensitic Transformation in Stainless Steels
Open this publication in new window or tab >>Martensitic Transformation in Stainless Steels
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2018. p. 62
Series
TRITA-ITM-AVL ; 2018:28
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-228054 (URN)978-91-7729-786-4 (ISBN)
Public defence
2018-06-14, Kollegiesalen, Brinellvägen 8, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2018-05-17 Created: 2018-05-16 Last updated: 2018-05-17Bibliographically approved

Open Access in DiVA

fulltext(1628 kB)33 downloads
File information
File name FULLTEXT01.pdfFile size 1628 kBChecksum SHA-512
73739ae39f876ab04938f5a5bacf908b7dc0c8a78ae267e9c9b658d29b5ff63a9374dfa9847ea663d628e607ed637fe421e3f0c0ff5db39039b3501637d5f6ac
Type fulltextMimetype application/pdf

Authority records BETA

Tian, YeHedström, Peter

Search in DiVA

By author/editor
Tian, YeBorgenstam, AnnikaHedström, Peter
By organisation
Materials Science and Engineering
Metallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar
Total: 33 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

urn-nbn

Altmetric score

urn-nbn
Total: 84 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