Advances in Research of Local Deformation Zone in Lightweight Medium Manganese Steels
ZHOU Yuhang, YANG Mingwei, FENG Yunli*
Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China
Abstract: Lightweight medium manganese steels are a representative of the third generation advanced high-strength steels. They have been found to exhibit Lüders bands and Portevin-Le Chatelier (PLC) bands on their stress-strain curves during deformation. The two types of bands originate from the presence of alloying elements such as C, Mn, Al, and can be regarded as a symbol of interaction between dislocations being pinned and depinned by C-Mn atomic group. Therefore these bands lead to surface defects that reduce the quality of the materials and are unfavorable for subsequent processing. Nowadays, the commonly used methods to eliminate surface defects caused by Lüders bands and PLC bands involve applying a small pre-strain to the material or controlling its microstructure before forming. But this approach is only effective for materials experiencing low strains from Lüders bands and PLC effects, and it has become highly important to seek a more effective method to delay or eliminate Lüders bands and PLC bands. This paper discusses the influencing factors of pre-strain, annealing temperature, annealing time length, and alloying elements on Lüders bands and PLC bands, starting with an outline to the underlying occurrences causing these bands. It further summarizes the specific reasons for mitigating or intensifying these bands from a microscopic perspective, including grain size, microstructure morphology, and dislocation density. The paper also emphasizes the effects of different alloy compositions and heat treatment processes on the formation, migration rate, and interaction time of C-Mn atomic group with dislocations, as well as the corresponding utilities in suppressing the formation and propagation of local deformation zone. It ends with a prospective discussion about the future development of the field based on the solutions provided in the published researches, and considering the aforementioned macroscopic and microscopic influencing factors.
周宇航, 杨明维, 冯运莉. 轻质中锰钢局部变形带的研究现状[J]. 材料导报, 2024, 38(21): 23080033-8.
ZHOU Yuhang, YANG Mingwei, FENG Yunli. Advances in Research of Local Deformation Zone in Lightweight Medium Manganese Steels. Materials Reports, 2024, 38(21): 23080033-8.
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