Recent Progress of Low and Medium-Carbon Advanced Martensitic Steels

Sugimoto, Koh Ichi

doi:10.3390/met11040652

Cited by 9 publications

(13 citation statements)

References 131 publications

(411 reference statements)

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“…It is much higher than those of Cr-Mo TM steels, but also it is much lower than those of D-MMn steels, Cr-Mo and Al-Nb TBF steels, and SCM420 Q&T steel tempered at 300 C to 600 C. [5] and TM steels ( ▲) [26], Al-Nb TBF steels (○, TIT = Ms − Mf)) [6], D-MMn (□) [17] and M-MMn (■) [24] steels with 1.5%Mn, 3%Mn, and 5%Mn, and SCM420 Q&T steel (◆, TT = 200 to 600 C) [5,26,27].…”

Section: Impact Toughnessmentioning

confidence: 99%

Effects of Partial Replacement of Si by Al on Impact Toughness of 0.2%C-Si-Mn-Cr-B TRIP-aided Martensitic Steel

Sugimoto¹,

Nakashima²,

Kobayashi³

et al. 2023

Preprint

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The effects of partial replacement of Si by Al on the microstructure, tensile properties, and Charpy impact toughness were investigated using 0.2%C-Si/Al-Mn-Cr-B TRIP-aided martensitic steels. The impact toughness was related to the microstructural and mechanical properties. The partial re-placement decreased the volume fraction of retained austenite and increased the mechanical stabil-ity, accompanied by softening and an increase in the volume fraction of the primary martensite. Resultantly, the partial replacement decreased strength and ductility. The impact absorbed energy (value) at 25 C was slightly increased by the partial replacement. The increased impact absorbed energy was mainly caused by high crack/void propagation energy due to the softened primary martensite and a small contribution of the stabilized retained austenite. The 50% shear fracture ductile-to-brittle transition temperature was marginally raised by the partial replacement. The raised transition temperature was mainly associated with an increase in a unit crack path of qua-si-cleavage/cleavage fracture.

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Section: Impact Toughnessmentioning

confidence: 99%

Effects of Partial Replacement of Si by Al on Impact Toughness of 0.2%C-Si-Mn-Cr-B TRIP-aided Martensitic Steel

Sugimoto¹,

Nakashima²,

Kobayashi³

et al. 2023

Preprint

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“…In previous decades, many typical heterogeneous structures, such as bimodal grains, nano-precipitate and gradient nano-structure [14][15][16], were artificially introduced to break this inversion relationship between strength and plasticity. In addition, the body-centered cubic (BCC) {112}<111>-type nanotwins were observed in the martensitic laths of the asquenched Fe-C-based alloys having low carbon and low alloy content, such as Fe-0.05C (wt.%), Fe-0.1C (wt.%) and Fe-Ni-0.08C (wt.%) in recent years, [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Quenching and Tempering-Dependent Evolution on the Microstructure and Mechanical Performance Based on a Laser Additively Manufactured 12CrNi2 Alloy Steel

et al. 2023

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For exploring an effective heat treatment schedule to enhance the strength–plasticity balance of the ferrite–austenite 12CrNi2 alloy steel additively manufactured by directed energy deposition (DED), 12CrNi2 was heat-treated with deliberately designed direct quenching (DQ) and cyclic quenching (CQ), respectively, and the differently quenched steels were then tempered at a temperature from 200 °C to 500 °C. It was found that the CQ, in contrast to the DQ, led the 12CrNi2 to have significantly increased tensile strength without losing its plasticity, based on the introduction of fine-grained lath martensite and the {112}<111>-type nanotwins. The nanotwins were completely degenerated after the 200 °C tempering. This led the CQ-treated steel to decrease in not only its tensile strength, but also its plasticity. In addition, an interesting phenomenon observed was that the DQ-induced laths and rod-like precipitates, and the tempering-induced laths and rod-like precipitates were all prone to be generated along the {112} planes of the martensitic crystal (α-Fe), which were exactly fitted with the {112}-type crystalline orientation of the long or short nanotwins in the CQ-induced martensite. The quenching–tempering-induced generation of the {112}-orientated laths and rod-like precipitates was explicated in connection with the {112}<111>-type long or short nanotwins in the CQ-induced lath martensite.

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“…To date, the first, second and third-generation advanced ultrahigh-and high-strength sheet steels (AHSSs) have been developed for the weight reduction and high crush safety of automobiles [1][2][3][4]. In most AHSSs, their ductility is enhanced by transformation-induced plasticity (TRIP) [5] and/or twinning-induced plasticity (TWIP) [6] of metastable retained austenite, reverted austenite, and austenite.…”

Section: Introductionmentioning

confidence: 99%

“…In most AHSSs, their ductility is enhanced by transformation-induced plasticity (TRIP) [5] and/or twinning-induced plasticity (TWIP) [6] of metastable retained austenite, reverted austenite, and austenite. These AHSSs are categorized as follows [4], 1.…”

Section: Introductionmentioning

confidence: 99%

“…The first-and third-generation AHSSs contain metastable retained austenite or reverted austenite of 5 to 40 vol.%-except for the DP and CP steels-and possess high ductility and cold formability by the TRIP effect of the retained austenite or reverted austenite. The third-generation AHSSs are classified into two types, Type A and Type B, by their kinds of matrix structures and tensile strengths (TS) [4]. The matrix structures and the TSs of Type A are bainitic ferrite (BF) and bainitic ferrite/martensite (BF/M), and higher than 1.0 GPa, respectively, except for D-MMn and L-MMn steels with an annealed martensite [17][18][19][20][21][22][23][24][25] and/or δ-ferrite [24] matrix structure.…”

Section: Introductionmentioning

confidence: 99%

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Cold Formabilities of Martensite-Type Medium Mn Steel

Sugimoto

Tanino

Kobayashi

2021

Metals

Self Cite

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Cold stretch-formability and stretch-flangeability of 0.2%C-1.5%Si-5.0%Mn (in mass%) martensite-type medium Mn steel were investigated for automotive applications. High stretch-formability and stretch-flangeability were obtained in the steel subjected to an isothermal transformation process at temperatures between Ms and Mf − 100 °C. Both formabilities of the steel decreased compared with those of 0.2%C-1.5%Si-1.5Mn and -3Mn steels (equivalent to TRIP-aided martensitic steels), despite a larger or the same uniform and total elongations, especially in the stretch-flangeability. The decreases were mainly caused by the presence of a large amount of martensite/austenite phase, although a large amount of metastable retained austenite made a positive contribution to the formabilities. High Mn content contributed to increasing the stretch-formability.

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Recent Progress of Low and Medium-Carbon Advanced Martensitic Steels

Cited by 9 publications

References 131 publications

Effects of Partial Replacement of Si by Al on Impact Toughness of 0.2%C-Si-Mn-Cr-B TRIP-aided Martensitic Steel

Effects of Partial Replacement of Si by Al on Impact Toughness of 0.2%C-Si-Mn-Cr-B TRIP-aided Martensitic Steel

Quenching and Tempering-Dependent Evolution on the Microstructure and Mechanical Performance Based on a Laser Additively Manufactured 12CrNi2 Alloy Steel

Cold Formabilities of Martensite-Type Medium Mn Steel

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