Effects of Nb on the microstructure and mechanical properties of 38MnB5 steel

Li, Baoshun; Zhu, Guangcan; Kang, Yonglin; Liu, Rendong

doi:10.1007/s12613-018-1670-z

Cited by 19 publications

(13 citation statements)

References 17 publications

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“…Figure 11b shows the comparisons of the UTS versus TE of experimental steel with other representatives of hot‐stamped steels. [ 6,7,10,11,39 ] Compared with other hot‐stamped steels, our present work presents a higher UTS. This level of comprehensive mechanical performance of hot‐stamped steel has rarely been reported.…”

Section: Resultsmentioning

confidence: 84%

Microstructure and Mechanical Properties of a Novel Ultra‐High Strength Hot‐Stamped Steel with High Hardenability

Chen

Chu

et al. 2022

steel research int.

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Herein, it is shown that the hot‐stamped steel exhibits high hardenability with a critical cooling rate of about 0.7 °C s−1 due to its unique chemical composition. The microstructure of the annealed sheet consists of ferrite, spherical carbides, and intergranular martensite. Thereinto, the generation of intergranular martensite can eliminate the yield point elongation and reduce the ratio of yield strength to ultimate tensile strength. Furthermore, compared with commercial 30MnB5 steel, the experimental steel (40Mn2CrNbV) quenched sheet shows excellent mechanical properties: yield strength (YS) = 1361 MPa, ultimate tensile strength (UTS) = 2422 MPa, and total elongation (TE) = 6.1%. Additionally, it is found that the Cr7C3 with a mean diameter of 240 ± 50 nm in the annealed quenching sheet can hinder dislocation movement to increase the yield strength. The coherent Nb‐rich (Nb, V)C precipitate (a mean diameter is <50 nm) in the cold‐rolled quenched sheet can improve the mechanical properties of the hot‐stamped steel.

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Section: Resultsmentioning

confidence: 84%

Microstructure and Mechanical Properties of a Novel Ultra‐High Strength Hot‐Stamped Steel with High Hardenability

Chen

Chu

et al. 2022

steel research int.

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“…The widely used steel grades for hot forming are Mn-Balloyed steels [24][25], whose chemical compositions and mechanical properties after quenching are listed in Table 1 [20,[26][27]. Among them, 22MnB5 steel is the first commercial grade available and still the most widely used in the automotive industry [3].…”

Section: Hot Forming Steel Gradementioning

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 compounds formed by Nb and non-metallic elements had a great solubility in the molten steel. The formula for the solid solubility of Nb in austenite is as follows: [18][19] lg( ) . .…”

Section: Effect Of the Secondary Phase On The Grain Sizementioning

confidence: 99%

Effect of Nb on the properties of a large-sized grinding ball

Song¹,

Zheng²,

Wang³

et al. 2019

Mater. Tehnol.

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Grinding balls are widely used in the mining industry due to their favorable properties; however, poor hardenability of largesized grinding balls is a limitation in wide applications. The hardenability and hardness of large-sized grinding balls can be affected by microalloying elements. In this work, Nb microalloying was used to improve the mechanical properties of largesized grinding balls. The microstructures and mechanical properties of Nb-containing grinding balls were studied in contrast to the Nb-free steel. Typical microstructures were observed with OM and SEM, respectively. The hardness was obtained with a Rockwell hardness tester. The results show that the typical microstructure of a large-sized grinding ball was mainly martensite and that the fracture surface consisted of dimples of different sizes. The prior-austenite grain size (PAGS) was decreased from 31.5 μm to 22.6 μm by adding 0.04 % Nb with a refined microstructure.

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Effects of Nb on the microstructure and mechanical properties of 38MnB5 steel

Cited by 19 publications

References 17 publications

Microstructure and Mechanical Properties of a Novel Ultra‐High Strength Hot‐Stamped Steel with High Hardenability

Microstructure and Mechanical Properties of a Novel Ultra‐High Strength Hot‐Stamped Steel with High Hardenability

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

Effect of Nb on the properties of a large-sized grinding ball

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