Details
| Original language | English |
|---|---|
| Pages (from-to) | 5922-5933 |
| Number of pages | 12 |
| Journal | Journal of Materials Research and Technology |
| Volume | 24 |
| Early online date | 25 Apr 2023 |
| Publication status | Published - May 2023 |
Abstract
This study evaluated the influence of heat treatment and thermomechanical training on the microstructural evolution and mechanical characteristics of conventional and additive-manufactured FeMnSi-based shape memory alloys. The conventional samples were produced by casting and rolling. The additive-manufactured samples were manufactured using the laser powder bed fusion (L-PBF) technique. Both specimens were subjected to the same heat treatment and thermomechanical training. The heat treatment involved solution annealing at 1050 °C for 2 h and aging at 750 °C for 6 h, and the thermomechanical training concluded with a 4% elongation at ambient temperature followed by annealing at 250 °C for 15 min. This training cycle was repeated four times for each sample after heat treatment. The heat treatment improved the pseudoelasticity and shape memory effect of the samples. Although training further enhanced the pseudoelasticity, it also reduced the shape memory effect. Thermomechanical training led to the formation of a large number of stacking faults, which facilitated the inverse phase transformation of martensite (ε) to austenite (γ) during unloading, resulting in improved pseudoelasticity. The heat-treated additive-manufactured samples showed the highest total recovery strain owing to the pseudoelasticity and shape memory effect. This characteristic could be due to the smaller grain size and higher volume fraction of precipitates. The precipitates and grain refinement improved the conditions for partial dislocation motion by increasing the back stresses on the martensite tip.
Keywords
- 4D printing, Fe-based shape memory alloy, Metal AM, Pseudoelasticity, Shape memory effect, Training
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Biomaterials
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Metals and Alloys
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In: Journal of Materials Research and Technology, Vol. 24, 05.2023, p. 5922-5933.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of thermomechanical treatment on the shape memory effect and pseudoelasticity behavior of conventional and additive manufactured Fe–Mn–Si–Cr–Ni-(V,C) shape memory alloys
AU - Mohri, Maryam
AU - Ferretto, Irene
AU - Khodaverdi, Hesamodin
AU - Leinenbach, Christian
AU - Ghafoori, Elyas
N1 - Funding Information: This research was partly supported by the EMPA POSTDOCS-II program that received funding from the European Union Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement number 754364 . The authors thank voestalpine BÖHLER Edelstahl GmbH & Co KG for providing the powder for the LPBF experiments. The authors (M.M and E.G) also gratefully acknowledges Prof. Mahmoud Nili-Ahmadabadi at Advanced Phase Transformation Laboratory, University of Tehran for providing TEM measurment.
PY - 2023/5
Y1 - 2023/5
N2 - This study evaluated the influence of heat treatment and thermomechanical training on the microstructural evolution and mechanical characteristics of conventional and additive-manufactured FeMnSi-based shape memory alloys. The conventional samples were produced by casting and rolling. The additive-manufactured samples were manufactured using the laser powder bed fusion (L-PBF) technique. Both specimens were subjected to the same heat treatment and thermomechanical training. The heat treatment involved solution annealing at 1050 °C for 2 h and aging at 750 °C for 6 h, and the thermomechanical training concluded with a 4% elongation at ambient temperature followed by annealing at 250 °C for 15 min. This training cycle was repeated four times for each sample after heat treatment. The heat treatment improved the pseudoelasticity and shape memory effect of the samples. Although training further enhanced the pseudoelasticity, it also reduced the shape memory effect. Thermomechanical training led to the formation of a large number of stacking faults, which facilitated the inverse phase transformation of martensite (ε) to austenite (γ) during unloading, resulting in improved pseudoelasticity. The heat-treated additive-manufactured samples showed the highest total recovery strain owing to the pseudoelasticity and shape memory effect. This characteristic could be due to the smaller grain size and higher volume fraction of precipitates. The precipitates and grain refinement improved the conditions for partial dislocation motion by increasing the back stresses on the martensite tip.
AB - This study evaluated the influence of heat treatment and thermomechanical training on the microstructural evolution and mechanical characteristics of conventional and additive-manufactured FeMnSi-based shape memory alloys. The conventional samples were produced by casting and rolling. The additive-manufactured samples were manufactured using the laser powder bed fusion (L-PBF) technique. Both specimens were subjected to the same heat treatment and thermomechanical training. The heat treatment involved solution annealing at 1050 °C for 2 h and aging at 750 °C for 6 h, and the thermomechanical training concluded with a 4% elongation at ambient temperature followed by annealing at 250 °C for 15 min. This training cycle was repeated four times for each sample after heat treatment. The heat treatment improved the pseudoelasticity and shape memory effect of the samples. Although training further enhanced the pseudoelasticity, it also reduced the shape memory effect. Thermomechanical training led to the formation of a large number of stacking faults, which facilitated the inverse phase transformation of martensite (ε) to austenite (γ) during unloading, resulting in improved pseudoelasticity. The heat-treated additive-manufactured samples showed the highest total recovery strain owing to the pseudoelasticity and shape memory effect. This characteristic could be due to the smaller grain size and higher volume fraction of precipitates. The precipitates and grain refinement improved the conditions for partial dislocation motion by increasing the back stresses on the martensite tip.
KW - 4D printing
KW - Fe-based shape memory alloy
KW - Metal AM
KW - Pseudoelasticity
KW - Shape memory effect
KW - Training
UR - http://www.scopus.com/inward/record.url?scp=85156166297&partnerID=8YFLogxK
U2 - 10.1016/j.jmrt.2023.04.195
DO - 10.1016/j.jmrt.2023.04.195
M3 - Article
AN - SCOPUS:85156166297
VL - 24
SP - 5922
EP - 5933
JO - Journal of Materials Research and Technology
JF - Journal of Materials Research and Technology
SN - 2238-7854
ER -