Irradiation-assisted pseudoelasticity in 316L stainless steel through dislocation loop-controlled martensitic phase transformations
We present pseudoelasticity activated by neutron irradiation in 316L austenitic stainless steel. Wrought and powder metallurgy with hot isostatic pressing (PM-HIP) specimens are irradiated to ∼4 displacements per atom at ∼400°C, then nanoindented. In wrought 316L, irradiation-induced voids and dislo...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2025-07-01
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| Series: | Materials Research Letters |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/21663831.2025.2509783 |
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| Summary: | We present pseudoelasticity activated by neutron irradiation in 316L austenitic stainless steel. Wrought and powder metallurgy with hot isostatic pressing (PM-HIP) specimens are irradiated to ∼4 displacements per atom at ∼400°C, then nanoindented. In wrought 316L, irradiation-induced voids and dislocation loops provide mechanical energy for γ→α′ martensitic transformation. But lower loop density in PM-HIP 316L changes the martensitic transformation pathway to reversible γ↔ε, enabling pseudoelasticity. Loops induce ε-martensite formation through compressive strain, with tensile strain driving ε-martensite growth. Strain recovery in PM-HIP 316L is superior to that in Fe-based shape memory alloys, providing promise for irradiation-engineered pseuoelasticity in austenitic steels. |
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| ISSN: | 2166-3831 |