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High-temperature split-hopkinson pressure bar with a momentum trap for obtaining flow stress behaviour and dynamic recrystallisation
RISE, Swerea, Swerea MEFOS.
Luleå University of Technology.
2014 (English)In: Strain, ISSN 0039-2103, E-ISSN 1475-1305, Vol. 50, no 6, p. 547-554Article in journal (Refereed)
Abstract [en]

In hot forming processes at elevated temperatures like wire rolling, microstructural changes such as repeated dynamic recrystallisation and grain growth occur. An experimental method to obtain the flow stress behaviour and to capture the recrystallised microstructure for materials subjected to large deformations, high temperatures between 900 and 1200°C and high strain rates around 5000s-1 is presented. The method is based on the split-Hopkinson pressure bar arrangement complemented with an inductive heat source. Furthermore, a momentum trap is added to ensure that the specimen is loaded only once. By quenching the specimen directly after the single loading, the dynamically recrystallised microstructure is preserved. The quenching is performed within 0.1s of loading by dropping the specimen into a water bath. By applying the momentum trap technique, the compressive loading of the specimen could be interrupted at a strain level slightly above the strain level corresponding to the peak stress, which is a good estimation for the onset of dynamic recrystallisation. © 2014 Wiley Publishing Ltd.

Place, publisher, year, edition, pages
2014. Vol. 50, no 6, p. 547-554
Keywords [en]
dynamic recrystallisation, high strain rates, high temperatures, momentum trap, split-Hopkinson pressure bar, wire rolling
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12652DOI: 10.1111/str.12115Scopus ID: 2-s2.0-84909631691OAI: oai:DiVA.org:ri-12652DiVA, id: diva2:972844
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-11-21Bibliographically approved

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