Abstract
The paper reviews the recent works concerning the Portevin–Le Chatelier (PLC) effect in Advanced High-Strength Steels (AHSSs) with a special attention to high-strength medium-manganese steels. Theories explaining the mechanism of the plastic instability phenomenon in steels with medium- and high-Mn contents were discussed. The relationships between microstructural effects such as TRIP (Transformation-Induced Plasticity), TWIP (Twinning-Induced Plasticity) and the PLC effect were characterized. The effects of processing conditions including a deformation state (hot-rolled and cold-rolled) and strain parameters (deformation temperature, strain rate) were addressed. Factors affecting the value of critical strain for the activation of serrated flow behavior in particular in medium-manganese steels were described.
Highlights
The plastic instability phenomenon was firstly described by Albert Portevin and Francois LeChatelier in 1923
The Portevin–Le Chatelier (PLC) effect in medium- and high-Mn steels was discussed based on the theory concerning the interaction between
The PLC effect in mediumand high-Mn steels was discussed based on the theory concerning the interaction between dislocations and Mn–C clusters
Summary
The plastic instability phenomenon was firstly described by Albert Portevin and Francois Le. During forming operations of sheets performed at various deformation rates, some amount of heat is generated, which affects the appearance and intensity of the plastic instability phenomenon [10]. Industrial application of those steels for body-in-white automobile components depends on their formability It was reported [6,8] that both mediumand high-Mn steels may show some manufacturing problems during forming related to the their plastic instability. The exact characteristics of the factors affecting the PLC effect in AHSS is very important, both from a research point of view and their industrial implementation. This overview concerns the PLC phenomenon in Advanced High Strength Steels (AHSSs), with particular emphasis on advanced medium-Mn TRIP steels
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