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Descripción
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| Abstract. The present work aims to propose a constitutive equation to model the mechanical performance under high strain-rate and different temperatures of materials that present yield-strength anomaly (YSA). Experimental-data analysis, from nickel-based and cobalt-based superalloys, show that the shape of the anomalous temperature dependence of the yield strength fairly depends on the type of superalloy (material and composition). Moreover, high strain-rate tests at, 1000s-1, confirm that the sudden temperature increment due to adiabatic heating does not lead to YSA because the mechanisms need some time to activate. The response model is formulated by considering the underlying micro-mechanisms responsible for the YSA along with some phenomenological equations, such as the Johnson-Cook model, to make it applicable to different alloys. Finally, experimental data from nickel-based and cobalt-based superalloys are fitted with the proposed model, demonstrating that is able to accurately capture the response of both alloys. | |
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Internacional
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Si |
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Nombre congreso
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Temperature dependence of material behaviour at high strain-rate. Proceedings of 24th DYMAT Technical Meeting |
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Tipo de participación
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960 |
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Lugar del congreso
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Stresa, Italy |
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Revisores
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Si |
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ISBN o ISSN
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978-88-85745-27-8 |
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DOI
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Fecha inicio congreso
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09/09/2019 |
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Fecha fin congreso
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11/09/2019 |
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Desde la página
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112 |
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Hasta la página
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117 |
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Título de las actas
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Proceedings of 24th DYMAT Technical Meeting 2019 |