Influences of hot stamping parameters on mechanical properties and microstructure of 30MnB5 and 22MnB5 quenched in flat die

Mu, Yanhong; Wang, Baoyu; Zhou, Jing; Huang, Xu; Li, Junling

doi:10.1007/s11771-018-3778-8

Cited by 9 publications

(9 citation statements)

References 19 publications

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“…For this, a treatment temperature of 550 • C was used and the cooling was in the air. With this sequence, both present tempered martensite in their microstructure [14][15][16]29].…”

Section: Methodsmentioning

confidence: 99%

“…It is a steel alloyed with chromium and molybdenum and acquires its final mechanical properties after being subjected to a quenching and tempering treatment. The starting microstructure of this steel is, fundamentally, pearlitic, with the presence of some particles of ferrite and cementite [14][15][16], obtaining a microstructure formed mainly by tempered martensite [15,16] after heat treatment. One of the advantages of 30MnB5 steels is that quenching and tempering makes the steel stronger and harder, thus increasing the durability of the final components that usually have a useful life that is double or triple that of items made from 65 G grade steels [17].…”

Section: Introductionmentioning

confidence: 99%

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Study of the Rotary Bending Fatigue Resistance of 30MnB5, 41CrS4 and 30MnVS6 Steels

et al. 2022

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In this study, a comparative analysis of the fatigue behavior of four types of steels, three of quenching and tempering (30MnB5 subjected to two different heat treatments and 41CrS4) and one microalloyed (30MnVS6), was carried out. The objective of the study is to determine if it is feasible to replace the quenching and tempering steel traditionally used in the manufacture of commercial vehicle axles (30MnB5) with alternative ones with the same composition but with modifications in their microstructure that improve their mechanical properties; a quenched and tempered chromium steel (41CrS4) and one that is microalloyed (30MnVS6). For this, rotary-bending fatigue tests have been carried out on the four types of steels with different stress levels. The fatigue resistance of quenched and tempered steels and microalloyed steel was evaluated using the fit of Basquin’s experimental data. Where possible, the fatigue limit was determined using the maximum likelihood method. It was concluded that, in general, the fatigue resistance of chromium-alloyed steel is higher than that of the reference steel, while the rest have lower fatigue resistance. On the other hand, it was determined that the fatigue limit of microalloyed steel is higher than the reference one and that of the reference steel is higher than that of the other two steels.

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“…For this, a treatment temperature of 550 • C was used and the cooling was in the air. With this sequence, both present tempered martensite in their microstructure [14][15][16]29].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the Rotary Bending Fatigue Resistance of 30MnB5, 41CrS4 and 30MnVS6 Steels

et al. 2022

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“…13(c)). Nam et al [76] described that stamping temperatures ranging from 500 to 700°C hardly influence the strength of the warm-stamped Nb-bearing 6Mn steel, in which nano-sized Nb carbides are dispersed in the fine martensitic structure. By contrast, the tensile strength of 22MnB5 steel is greatly affected by the deformation temperature because austenite with much lower stability could transform to ferrite and pearlite before die quenching at a low deformation temperature, leading to incomplete martensitic transformation [77].…”

Section: Forming Temperaturementioning

confidence: 99%

Medium-Mn steels for hot forming application in the automotive industry

Luo

2021

Int J Miner Metall Mater

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Advanced high-strength steels have been widely used to improve the crashworthiness and lightweight of vehicles. Different from the popular cold stamping, hot forming of boron-alloyed manganese steels, such as 22MnB5, could produce ultra-high-strength steel parts without springback and with accurate control of dimensions. Moreover, hot-formed medium-Mn steels could have many advantages, including better mechanical properties and lower production cost, over hot-formed 22MnB5. This paper reviews the hot forming process in the automotive industry, hot-formed steel grades, and medium-Mn steel grades and their application in hot forming in depth. In particular, the adaptabilities of medium-Mn steels and the presently popular 22MnB5 into hot forming were compared thoroughly. Future research should focus on the technological issues encountered in hot forming of medium-Mn steels to promote their commercialization.

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“…The most common high-strength boron steel is 22MnB5 steel, which has a lot of ferrite and pearlite in the matrix structure. After hot stamping, the strength of 22MnB5 steel is found to increase from about 600 MPa to more than 1200 MPa, and a large amount of martensite is formed in the matrix structure [3,4].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of magnetic field assisted laser wire-filled welded 22MnB5 steel joints

Zhu,

Liu,

Yin

et al. 2023

Mater. Res. Express

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The magnetic field-assisted laser wire-filled welding test of 1.5 mm automotive 22MnB5 steel is performed to investigate the influence of magnetic field on the microstructure and properties of the welded joints. When no magnetic field is applied, and the laser heat input is 190 J mm−1, the welded joint width and the grain size of the coarse grain region are large. Also, there is an obvious hump defect at the bottom of the weld. Under the same heat input conditions, when a 5 mT and 15 mT steady magnetic field is applied, the thermoelectric magnetic force generated by the magnetic field promoted the flow of molten pool and concentrated laser energy. It is found that the hump defect is eliminated, the width of the welded joint is reduced, the grain size of the coarse grain region is significantly reduced, and the overall hardness of the welded joint is improved. However, different magnetic induction intensities have different effects on the solid phase transformation of the weld. When no magnetic field is added, the weld center is mainly composed of granular bainite and polygonal ferrite due to the slow cooling rate of the molten pool. When the applied magnetic field is 5 mT, the center of the weld is mainly composed of brittle and hard upper bainite because the thermoelectric magnetic force stirs the molten pool and accelerates the cooling rate of the molten pool but the overall mechanical properties of the welded joint were relatively poor. At 15 mT, lath martensite and lower bainite predominate in the weld center due to the increased cooling rate of the molten pool, thereby increasing the overall mechanical properties of the welded joint. Therefore, choosing the appropriate magnetic induction intensity is critical for improving the microstructure and properties of welded joints.

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Influences of hot stamping parameters on mechanical properties and microstructure of 30MnB5 and 22MnB5 quenched in flat die

Cited by 9 publications

References 19 publications

Study of the Rotary Bending Fatigue Resistance of 30MnB5, 41CrS4 and 30MnVS6 Steels

Study of the Rotary Bending Fatigue Resistance of 30MnB5, 41CrS4 and 30MnVS6 Steels

Medium-Mn steels for hot forming application in the automotive industry

Microstructure and properties of magnetic field assisted laser wire-filled welded 22MnB5 steel joints

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