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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 (IRN).
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0003-3772-4371
Saint Petersburg State University, 7/9 Universitetskaya Nab., St. Petersburg (RUS); Ufa State Aviation Technical University, K. Marx 12, Ufa (RUS).
Division of Engineering Materials, Department of Management and Engineering, Linköping University, Linköping (SWE).
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2021 (Engelska)Ingår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 811, artikel-id 141086Artikel i tidskrift (Refereegranskat) 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 ?-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.

Ort, förlag, år, upplaga, sidor
ELSEVIER SCIENCE SA , 2021. Vol. 811, artikel-id 141086
Nyckelord [en]
Additive manufacturing (AM); High pressure torsion (HPT); Nanoindentation; Electron back-scattered diffraction (EBSD); Stainless steel; Phase transformation (PT)
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Bearbetnings-, yt- och fogningsteknik
Forskningsämne
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URN: urn:nbn:se:hv:diva-17298DOI: 10.1016/j.msea.2021.141086ISI: 000636780500001Scopus ID: s2.0-85102877302OAI: oai:DiVA.org:hv-17298DiVA, id: diva2:1599613
Anmärkning

This research is supported in part by a research grant from Science Foundation Ireland (SFI) under Grant Number 16/RC/3872 and is cofounded under the European Regional Development Fund and by I- Form industry partners. Also, the assistance of staff and technicians in Dublin City University and Waterford Institute of  Technology is acknowledged. NE acknowledges the support by Saint Petersburg State University via Lot 2017 Applied (id:26130576)

Tillgänglig från: 2021-10-01 Skapad: 2021-10-01 Senast uppdaterad: 2021-11-18Bibliografiskt granskad

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Neikter, Magnus

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