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- W2022871911 abstract "Abstract High temperature stress-strain data were obtained for type 310 austenitic steel with grain sizes of 1 and 63 μm. The data were fitted to the equation σ = σ y + A ϵ 1 2 where σy is defined by the Hall-Petch relation. When shear modulus changes had been taken into account the work-hardening parameter A was found to be temperature independent up to 720 K for recrystallized 1 μm samples and up to 870 K for well-annealed 63 μm samples. These temperatures correspond exactly to the spreading temperatures Ts of extraneous grain boundary dislocations. We confirmed that grain boundaries can become non-equilibrium structures when they are created during recrystallization. The equilibration process occurs at about 0.7Tm. When the test temperature is raised above Ts a crossing of the stress-strain curves for samples of different grain sizes occurs. To explain the observed dependence of A on T a model is proposed which is based on (1) the assumption that annihilation of lattice dislocations by spreading in grain boundaries is an important dynamic recovery mechanism and (2) the application of Ashby's concept. The results indicate the necessity of reinterpreting many studies on the grain size dependence of properties." @default.
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- W2022871911 title "The effect of the spreading of grain boundary dislocations on the tensile behaviour of a fine-grained austenitic steel at high temperatures" @default.
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