Portevin Le Chatelier plastic instabilities study by infrared pyrometry in C-Mn steels

Abstract : The dynamic strain aging phenomenon which occurs in some materials under certain temperature and strain rate conditions can cause a localization of the plastic strain in the form of bands (bands of Portevin Le Chatelier) which is detrimental on the material ductility (fracture toughness). At a microscopic strain, this phenomenon is explained by the interaction of mobile dislocations with the interstitial solute atoms. The dislocation gliding is not continuous, but discontinuous. Dislocations are temporarily stopped on the obstacles (forest, precipitates…) during a waiting time t w. During this waiting time, the diffusion of the solute atoms creates an additional anchoring of dislocations. So, the phenomenon is active in a domain of strain rate and temperature. In C-Mn steels, the diffusive species are carbon and nitrogen and the DSA phenomenon occurs for common strain rate in a temperature range of 150-300°C which complicates the observation. The increment of plastic strain associated with each band causes an increment in temperature which can be measured by infrared pyrometry. This experimental technique was used in this paper on a C-Mn steel heated around 200°C by an induction furnace to visualize the strain localization patterns. Some characteristics of these bands are measured and thus the evolution of these characteristics according to the strain rate is presented.
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Wei Wei Du, Nicolas Ranc, Isabelle Ranc, Danièle Wagner. Portevin Le Chatelier plastic instabilities study by infrared pyrometry in C-Mn steels. 13th International Conference on Fracture, Jun 2013, Beijing, China. ⟨hal-01687582⟩



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