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Roles of Nitrogen on TWIP in Advanced Austenitic Stainless Steels
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering. Sandvik Mat Technol, Sweden.
Sandvik Mat Technol, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering. Sandvik Mat Technol, Sweden.
KTH, Sweden; Chongqing Univ, Peoples R China.
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2023 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 94, no 10, article id 2200359Article in journal (Refereed) Published
Abstract [en]

The influence of nitrogen on the mechanical properties of two high Ni containing advanced austenitic stainless steels with low stacking fault energies is investigated. The results show that increase of nitrogen content greatly increases both strength and elongation of the steel at the same time. At the cryogenic temperature, the steels show a twin induced plasticity behavior. Ab initio calculations indicate that the increase of nitrogen slightly increases the stacking fault energy and consequently the critical shear stress for twin initiation in the steel. However, addition of nitrogen significantly increases the flow stress. This leads to a smaller critical strain for twin initiation and promotes deformation twinning in the high nitrogen steel. This is confirmed by the microstructure investigation. Deformation in steels is a competitive process between slip and twinning. Dislocation slip is dominant at low strain range, but formation of stacking fault and twinning become important in the later stages of deformation. At cryogenic temperature, it is mainly deformation twinning. The influence of nitrogen addition on magnetic property and its effect on deformation twinning are also discussed. The present study increases the understanding for the development of high-performance and low-cost advanced austenitic stainless steels.

Place, publisher, year, edition, pages
Wiley-V C H Verlag GMBH , 2023. Vol. 94, no 10, article id 2200359
Keywords [en]
austenitic stainless steels; elongation; nitrogen; strengthening; twin induced plasticity
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-188442DOI: 10.1002/srin.202200359ISI: 000846678800001OAI: oai:DiVA.org:liu-188442DiVA, id: diva2:1695684
Available from: 2022-09-14 Created: 2022-09-14 Last updated: 2024-01-10Bibliographically approved

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Chai, GuocaiNordström, Joakim

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