Effects of Static Strain Aging on Mechanical Performance of Ductile Cast Iron
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2024-10
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Language
en
Pages
18
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Journal of Materials Engineering and Performance, Volume 33, issue 19, pp. 10131-10148
Abstract
EN-GJS-400-15U nodular cast iron intended to be used as load-bearing element in long-term geological disposal canisters containing spent nuclear fuel in Finland and Sweden was studied for static strain aging (SSA). Tensile test specimens manufactured from the nodular cast iron were pre-strained to 1%, 2% and 3% nominal plastic strains. The pre-strained specimens were aged at different temperatures ranging from room temperature to 400 °C for varying times. The aged specimens were tested with conventional tensile testing using constant cross-head speed of 0.016 mm/s. Additionally, four specimens were studied with digital image correlation (DIC) during the tensile testing to obtain full-field strain measurements. SSA resulted in elevated pronounced yield point in all the conditions, while the as-received material showed continuous yielding behavior. SSA reduced the elongation to fracture. DIC tests showed more localized yielding behavior in the SSA specimens. Over-aging effect was observed at 400 °C where increasing pre-strain did not increase the yield stress more. For 1-day aging time, the highest yield stress increment was found after aging at 200°C. The yield stress of the material was almost identical after aging in 100°C and 200°C.Description
Publisher Copyright: © The Author(s) 2024.
Keywords
DIC, ductile cast iron, spent nuclear fuel, strain aging, strain localization
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Citation
Björklund, V, Hänninen, H & Bossuyt, S 2024, ' Effects of Static Strain Aging on Mechanical Performance of Ductile Cast Iron ', Journal of Materials Engineering and Performance, vol. 33, no. 19, pp. 10131-10148 . https://doi.org/10.1007/s11665-024-09716-9