The Origins of Tritium and Helium Effects on the Tensile Properties of Metals
| Autor: | N. Y. C. Yang, S. L. Robinson |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Austenite
Materials science 020209 energy General Engineering 02 engineering and technology 01 natural sciences 010305 fluids & plasmas Intergranular fracture Superalloy 0103 physical sciences Ultimate tensile strength 0202 electrical engineering electronic engineering information engineering Grain boundary Dislocation Composite material Ductility Crystal twinning |
| Zdroj: | Fusion Technology. 21:856-860 |
| ISSN: | 0748-1896 |
| DOI: | 10.13182/fst92-a29856 |
| Popis: | In this paper, the effects of internal tritium and helium on the tensile properties of two austenitic stainless steels and an iron-based superalloys have been studied. The materials tested were, forged 21 Cr-6Ni-9Mn and 304L (tested in the annealed condition and tow forged conditions), and a modified A-286 alloy. The accumulation of {sup 3}He from the radioactive decay of tritium caused an increase in the yield strength and a continuous decrease in the ductility in almost all materials tested. Increased {sup 3}He concentrations also caused a change in fracture mode form ductile rupture to predominantly intergranular fracture. The property changes resulted from {sup 3}He bubble-induced strengthening, which produced a change in deformation mode form long-range dislocation activity to deformation twinning. In the deformation-twinning mode, the {sup 3}He-accelerated fracture initiated at the intersections of deformation twins with grain boundaries. High-strength forged 304L was most resistant to {sup 3}He effects owing to the redistribution of {sup 3}He on dislocations. |
| Databáze: | OpenAIRE |
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