The mechanism of dynamic strain aging for type A serrations in tensile curves of a medium-Mn steel

Nam, Jae-Hoon; Oh, Seon-Keun; Park, Myeong-heom; Lee, Young Kook

doi:10.1016/j.actamat.2020.116613

Cited by 44 publications

(18 citation statements)

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“…[ 31 ] In contrast, recent studies suggest that the occurrence of serrated flow might not been caused by the TRIP effect but by the dislocation arrest model. [ 42 ]…”

Section: Discussionmentioning

confidence: 99%

Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels

Gramlich

Bleck

2021

steel research int.

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The mechanical properties after tempering and intercritical annealing of medium manganese steels with 4 wt% Mn for forging applications are presented. After forging with subsequent air cooling, heat treatments were performed, specifically tempering from 250 and 450 °C and intercritical annealing between 600 and 675 °C. Tensile properties, Charpy V‐notch impact toughness, and hardness were determined and compared with microstructural features characterized by metallography and synchrotron measurements, leading to the classification of six different heat treatment stages for medium manganese steels. Furthermore, the effects of different alloying additions (boron 0.0016–0.0057 wt%, molybdenum 0.2 wt%, and aluminum 0.5 wt%) are discussed with respect to the mechanical properties. It is shown that boron increases the impact toughness more effectively in the tempering regime, while the molybdenum alloyed samples exhibit higher toughness after intercritical annealing. Most of the materials and heat treatment states follow the inverse relationship between toughness and strength, while the aluminum alloyed samples show a superior toughness after tempering.

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“…[ 31 ] In contrast, recent studies suggest that the occurrence of serrated flow might not been caused by the TRIP effect but by the dislocation arrest model. [ 42 ]…”

Section: Discussionmentioning

confidence: 99%

Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels

Gramlich

Bleck

2021

steel research int.

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“…Motomichi KOYAMA, 1,2,3) * Takayuki YAMASHITA, 4) Satoshi MOROOKA, 5) Takahiro SAWAGUCHI, 6) Zhipeng YANG, 1,2) Tomohiko HOJO, 1,2) Takuro KAWASAKI 7) and Stefanus HARJO 7) microstructure, and show a high work-hardening capability. 1,12) Furthermore, the Lüders deformation of medium-Mn steels is characterized by deformation-induced martensitic transformation, 13,14) microscopic strain partitioning, 15) and macroscopic plasticity discontinuity.…”

Section: Microstructure and Plasticity Evolution During Lüders Deform...mentioning

confidence: 99%

“…Medium-Mn TRIP steels have been found to demonstrate heterogeneous plastic deformation. 1) In particular, cold-rolled and intercritically annealed medium-Mn steels show distinct evolution of Lüders 2,3) and Portevin-Le Chatelier 4,5) bands after yielding. The behavior of the macroscopically heterogeneous deformation has been noted in order to elucidate the characteristic stress-strain response in the early plasticity stage.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Plasticity Evolution During Lüders Deformation in an Fe-5Mn-0.1C Medium-Mn Steel

et al. 2022

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The local plasticity and associated microstructure evolution in Fe-5Mn-0.1C medium-Mn steel (wt.%) were investigated in this study. Specifically, the micro-deformation mechanism during Lüders banding was characterized based on multi-scale electron backscatter diffraction measurements and electron channeling contrast imaging. Similar to other medium-Mn steels, the Fe-5Mn-0.1C steel showed discontinuous macroscopic deformation, preferential plastic deformation in austenite, and deformation-induced martensitic transformation during Lüders deformation. Hexagonal close-packed martensite was also observed as an intermediate phase. Furthermore, an in-situ neutron diffraction experiment revealed that the pre-existing body-centered cubic phase, which was mainly ferrite, was a minor deformation path, although ferrite was the major constituent phase.

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“…Despite the exceptional mechanical properties, the applications of TWIP steels are limited by the challenges in casting, welding and delayed fracture due to the high Mn and C contents. In order to achieve superior mechanical properties, low cost and easy manufacturing properties, the development of the third generation AHSS began in the 2000s, which includes Q&P steel [21][22][23], MMS [24][25][26], and carbide-free bainitic (CFB) steel [27][28][29]. The microstructure of the third generation AHSS is typically composed of martensite/ferrite/bainite plus metastable retained austenite.…”

Section: Future Perspectivesmentioning

confidence: 99%

Recent developments and perspectives of advanced high-strength medium Mn steel: from material design to failure mechanisms

Huang

Liu

et al. 2022

Mater. Futures

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Advanced high-strength steels are key structural materials for the development of next-generation energy-efficient and environmentally friendly vehicles. Medium Mn steel, as one of the latest generation advanced high-strength steels, has attracted tremendous attentions over the past decade due to its excellent mechanical properties. Here, the state-of-the-art developments of medium Mn steel are systematically reviewed with focus on the following crucial aspects: (i) the alloy design strategies; (ii) the thermomechanical processing routes for the optimizations of microstructure and mechanical properties; (iii) the fracture mechanisms and toughening strategies; and (iv) the hydrogen embrittlement mechanisms and improvement strategies.

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The mechanism of dynamic strain aging for type A serrations in tensile curves of a medium-Mn steel

Cited by 44 publications

References 50 publications

Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels

Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels

Microstructure and Plasticity Evolution During Lüders Deformation in an Fe-5Mn-0.1C Medium-Mn Steel

Recent developments and perspectives of advanced high-strength medium Mn steel: from material design to failure mechanisms

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