Details
| Original language | English |
|---|---|
| Pages (from-to) | 2207-2216 |
| Number of pages | 10 |
| Journal | Welding in the world |
| Volume | 66 |
| Issue number | 11 |
| Early online date | 16 Aug 2022 |
| Publication status | Published - Nov 2022 |
Abstract
Iron-based shape memory alloys have recently attracted increased attention due to their low material costs combined with good workability and high transformation strains. They show excellent welding properties, as shown by several studies and compared to non-iron-based shape memory alloys, and are potential candidate materials for large-scale application as damping elements in building structures. Since subsequent heat treatment is only possible to a limited extent for large-scale components, it is necessary to minimize the effects of processing and welding operations on the shape memory properties. Therefore, a suitable microstructure must be established in the heat-affected zone and the fusion zone during the welding process. Thus, industrially processed polycrystalline Fe-Mn-Al-Ni was joined by tungsten inert gas welding with matching filler material. The phases formed upon welding with different parameters were investigated using optical microscopy, scanning electron microscopy and X-ray diffraction. Shielding gas composition as well as mean arc linear energy have a huge impact on the γ-phase precipitation. Intercrystalline cracking can be supressed by increasing the γ content. Further, the α-fraction and grain size in the fusion zone can be controlled by the welding parameters. Ultimately, a hardness value of the fusion zone equal to heat-treated material was achieved which suggests that the fusion zone may be able to transfer the stress required for martensitic transformation.
Keywords
- Fe-Mn-Al-Ni, Iron-based shape memory alloy, Pre-weld heat-treatment, Process parameters, Tungsten inert gas welding, α/γ-phase ratio
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Materials Science(all)
- Metals and Alloys
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In: Welding in the world, Vol. 66, No. 11, 11.2022, p. 2207-2216.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Welding characteristics and microstructure of an industrially processed Fe-Mn-Al-Ni shape memory alloy joined by tungsten inert gas welding
AU - Viebranz, Vincent Fabian
AU - Hassel, Thomas
AU - Niendorf, Thomas
AU - Maier, Hans Jürgen
N1 - Funding Information: The material was processed by thyssenkrupp Steel Europe AG (Duisburg, Germany). Funding Information: Open Access funding enabled and organized by Projekt DEAL. Financial support by Deutsche Forschungsgemeinschaft under project number 401738767 is gratefully acknowledged.
PY - 2022/11
Y1 - 2022/11
N2 - Iron-based shape memory alloys have recently attracted increased attention due to their low material costs combined with good workability and high transformation strains. They show excellent welding properties, as shown by several studies and compared to non-iron-based shape memory alloys, and are potential candidate materials for large-scale application as damping elements in building structures. Since subsequent heat treatment is only possible to a limited extent for large-scale components, it is necessary to minimize the effects of processing and welding operations on the shape memory properties. Therefore, a suitable microstructure must be established in the heat-affected zone and the fusion zone during the welding process. Thus, industrially processed polycrystalline Fe-Mn-Al-Ni was joined by tungsten inert gas welding with matching filler material. The phases formed upon welding with different parameters were investigated using optical microscopy, scanning electron microscopy and X-ray diffraction. Shielding gas composition as well as mean arc linear energy have a huge impact on the γ-phase precipitation. Intercrystalline cracking can be supressed by increasing the γ content. Further, the α-fraction and grain size in the fusion zone can be controlled by the welding parameters. Ultimately, a hardness value of the fusion zone equal to heat-treated material was achieved which suggests that the fusion zone may be able to transfer the stress required for martensitic transformation.
AB - Iron-based shape memory alloys have recently attracted increased attention due to their low material costs combined with good workability and high transformation strains. They show excellent welding properties, as shown by several studies and compared to non-iron-based shape memory alloys, and are potential candidate materials for large-scale application as damping elements in building structures. Since subsequent heat treatment is only possible to a limited extent for large-scale components, it is necessary to minimize the effects of processing and welding operations on the shape memory properties. Therefore, a suitable microstructure must be established in the heat-affected zone and the fusion zone during the welding process. Thus, industrially processed polycrystalline Fe-Mn-Al-Ni was joined by tungsten inert gas welding with matching filler material. The phases formed upon welding with different parameters were investigated using optical microscopy, scanning electron microscopy and X-ray diffraction. Shielding gas composition as well as mean arc linear energy have a huge impact on the γ-phase precipitation. Intercrystalline cracking can be supressed by increasing the γ content. Further, the α-fraction and grain size in the fusion zone can be controlled by the welding parameters. Ultimately, a hardness value of the fusion zone equal to heat-treated material was achieved which suggests that the fusion zone may be able to transfer the stress required for martensitic transformation.
KW - Fe-Mn-Al-Ni
KW - Iron-based shape memory alloy
KW - Pre-weld heat-treatment
KW - Process parameters
KW - Tungsten inert gas welding
KW - α/γ-phase ratio
UR - http://www.scopus.com/inward/record.url?scp=85136104354&partnerID=8YFLogxK
U2 - 10.1007/s40194-022-01364-8
DO - 10.1007/s40194-022-01364-8
M3 - Article
AN - SCOPUS:85136104354
VL - 66
SP - 2207
EP - 2216
JO - Welding in the world
JF - Welding in the world
SN - 0043-2288
IS - 11
ER -