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Post-treatment of additively manufactured Fe-Cr-Ni stainless steels by high pressure torsion: TRIP effect
Department of Materials Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran.
Department of Engineering Science, University West, 46153 Trollhättan, Sweden.
Saint Petersburg State University, 7/9 Universitetskaya Nab., St. Petersburg, 199034, Russia. Ufa State Aviation Technical University, K. Marx 12, Ufa, 450008, Russia.
Division of Engineering Materials, Department of Management and Engineering, Linköping University, Linköping SE-58183, Sweden.
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2021 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 811, article id 141086Article in journal (Refereed) Published
Abstract [en]

High pressure torsion (HPT) at room temperature was used for post-treatment of additively manufactured Fe-Cr-Ni stainless steel with 12.9 wt. % Ni as a very strong austenite stabilizer. The results showed that HPT caused a considerable increase in nanohardness of the additively manufactured samples. In contrast with thermodynamic equilibrium-state modeling, a phase transformation from FCC to HCP structure occurred, leading to the formation of ε-martensite during HPT on high angle boundaries, low angle boundaries, and dislocation cells with no detection of deformation twins. It was demonstrated that the combination of additive manufacturing thanks to the high density of dislocations after solidification and HPT process expands the opportunities of both methods to control deformation mechanisms in stainless steels leading to different phase and microstructural features. Thus, the outcome of this study provides a fundamental basis to design advanced structural materials.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 811, article id 141086
Keywords [en]
Additive manufacturing (AM), High pressure torsion (HPT), Nanoindentation, Electron back-scattered diffraction (EBSD), stainless steel, phase transformation (PT)
National Category
Manufacturing, Surface and Joining Technology
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-83305DOI: 10.1016/j.msea.2021.141086ISI: 000636780500001Scopus ID: 2-s2.0-85102877302OAI: oai:DiVA.org:ltu-83305DiVA, id: diva2:1538236
Funder
European Regional Development Fund (ERDF)
Note

Validerad;2021;Nivå 2;2021-04-08 (alebob);

Finansiär: Science Foundation Ireland  (16/RC/3872); I-Form industry partners; Saint Petersburg State University (26130576)

Available from: 2021-03-18 Created: 2021-03-18 Last updated: 2021-05-03Bibliographically approved

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Forouzan, Farnoosh

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