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Experimental studies of Portevin-Le Chatelier plastic instabilities in carbon-manganese steels by infrared pyrometry

Type
Articles dans des revues avec comité de lecture
Auteur
RANC, Nicolas
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
DU, W
233900 Laboratoire Energétique Mécanique Electromagnétisme [LEME]
RANC, I
233900 Laboratoire Energétique Mécanique Electromagnétisme [LEME]
WAGNER, D
233900 Laboratoire Energétique Mécanique Electromagnétisme [LEME]

URI
http://hdl.handle.net/10985/11244
DOI
10.1016/j.msea.2016.03.096
Date
2016
Journal
Materials Science and Engineering: A

Résumé

The dynamic strain aging (DSA) phenomenon that occurs in some materials under certain temperature and strain rate conditions can cause plastic strain localization in the form of Portevin-Le Chatelier (PLC) bands. Carbon-manganese steels are used commonly and frequently in construction because of their ductility, low cost and ability to form mechanically. In these steels, the DSA phenomenon occurs for common quasi-static strain rates from 150 to 300 °C, which makes band observation complicated. PLC bands on a carbon-manganese steel that was sensitive to DSA were studied using an infrared camera. Specimen heating was achieved using an induction furnace (with an adapted coil inductor), which allows for temperature recording during tensile tests. Thermography with an infrared camera was used to estimate the band characteristics and increments in band plastic strain, which is an important parameter for material behavior identification necessary for DSA phenomenon modeling. This technique had been developed only for PLC phenomenon observation at ambient temperature on aluminum alloys. Band characteristics on the carbon-manganese steels have been compared with results obtained previously on aluminum alloys.

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