Plasticity enhancement mechanism: Effect of the annealing temperature on strain-induced segmented martensitic transformations and Portevin–Le Chatelier bands in 7Mn steel after deep cryogenic treatment

Zhang, Mei; Sun, Xiaoning; Zhang, Bendao; Cen, Qiongying; Han, Dong

doi:10.1016/j.matchar.2022.112475

Cited by 7 publications

(1 citation statement)

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“…Serrated flow [1], or the Portevin-Le Chatelier (PLC) effect [2], viewed in the stressstrain curve during plastic deformation is a plastic instability behavior that has been studied in various kinds of aluminum alloys [3,4], nickel-based superalloys [5][6][7], magnesium alloys [8][9][10], and steel [11][12][13][14]. The primary characteristic of the PLC effect is a serrated oscillation pattern in tensile curves after achieving the yield point resulting from repetitive nucleation and the development of localized deformation regions [15,16]. The dynamicstrain-aging (DSA) interaction between mobile dislocations and solute atom clouds during plastic deformation has been widely accepted as an explanation for the serrations of the stress-strain curve during static tensile tests.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Serrated Flow and Microstructural Evolution in MarBN Steel

Zou,

Wang,

Pei

et al. 2023

Materials

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The mechanisms of serrated flow and microstructural evolution in MarBN steel were studied under two strain rates (5 × 10−3 s−1 and 5 × 10−5 s−1) at room temperature and high temperatures (430 °C and 630 °C). The experimental results show that the type-C serrations occurred at all temperatures under a high strain rate of 5 × 10−3 s−1. In contrast, type-B serrations occurred at 430 °C and 630 °C under a low strain rate of 5 × 10−3 s−1, indicating that the type of serrated flow was related to the strain rate. The microstructural results reveal that pinning and unpinning dislocation under both strain rates were responsible for the serrations at both strain rates.

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