Microstructure evolution and enhanced performance of a novel Nb-Mo microalloyed medium Mn alloy fabricated by low-temperature rolling and warm stamping

Pan, Hucheng; Cai, Minghui; Ding, Hua; Huang, Huiqiang; Zhu, Bin; Wang, Y.L.; Zhang, Y.S.

doi:10.1016/j.matdes.2017.08.047

Cited by 63 publications

(22 citation statements)

References 32 publications

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“…The combined effects of rolling temperature on the overall properties of medium Mn steel resulted from the following aspects, i.e. phase constituent, the fraction of retained austenite and the mechanical stability of retained austenite [6][7][8]14,15 . In particular, the multiple Nb-Mo microalloying plus warm rolling may be a promising method for the development of a new generation of advanced high-strength medium Mn steel.…”

Section: Discussionmentioning

confidence: 99%

“…These new processing routes may offer a new opportunity for practical production of ultrahigh strength medium Mn steel, in view of the heavy springback during cold rolling [5][6][7][8] . As demonstrated in our preliminary work, dozens of passes in the cold rolling of medium Mn steel were required to reduce the sheet thickness from 4 to 1 mm.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Rolling Temperature on Microstructure and Mechanical Properties of a Nb-Mo Microalloyed Medium Mn Steel

Liu

et al. 2019

Mat. Res.

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Warm rolling of medium Mn steel is a promising technology to meet the needs of vehicle weight reduction and energy conservation while ensuring the safety for passengers. In this study, a novel Nb-Mo microalloyed 6.6Mn steel was subjected to a series of warm rolling tests at temperatures ranging from 630 to 690 ℃, based on the thermodynamic-based prediction of intercritical annealing using a Thermo-Calc software. As a comparison, a conventional multi-stage thermo-mechanical process involving hot rolling, cold rolling and inter-critical annealing was carried out as well. The optimal rolling temperature parameters for warm rolling was explored through tensile tests and the detailed microstructural characterization. The experimental results show that the microstructure and mechanical characteristics strongly depended on the warm rolling temperature. A better combination of UTS and TE products (~32.0 GPa•%) was achieved in the 660ºC-warm-rolled specimen, which is much higher than 12.3 GPa•% for the hot formed 22MnB5 steel and is also comparable to 38.3 GPa•% for the annealed cold-rolled specimens.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Rolling Temperature on Microstructure and Mechanical Properties of a Nb-Mo Microalloyed Medium Mn Steel

Liu

et al. 2019

Mat. Res.

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“…After soaking, the heated material is rapidly transferred to the die and stamped and quenched as in the conventional procedure. Some retained austenite may be present at room temperature, but most of the microstructure is martensitic [144][145][146]. However, microstructural evolution during the LTHS process has not yet been studied in depth, nor has its effect on forming behaviour and final mechanical behaviour been investigated.…”

Section: Application Of Low-temperature Hot Stamping Process In Medium-mn Steelmentioning

confidence: 99%

“…They found that unlike in hot-stamped 22MnB5 steel, the M s temperature was not sensitive to the forming temperature and pressure, resulting in even distributions of microstructure and mechanical properties. Pan et al [145] investigated the tensile behaviour of low-temperature hot stamped 5.6Mn steel after warm rolling without ART annealing. An excellent UTS × TE product of around 27.5 GPa•% was obtained in this material.…”

Section: Application Of Low-temperature Hot Stamping Process In Medium-mn Steelmentioning

confidence: 99%

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

Tong

Rong

Yardley

et al. 2020

Metals

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Improvement of the hot stamping process is important for reducing processing costs and improving the productivity and tensile properties of final components. One major approach to this has been to conduct all or part of the process at lower temperatures. The present paper reviews the state of the art of hot stamping techniques and their applications, considering the following aspects: (1) conventional hot stamping and its advanced developments; (2) warm stamping approaches in which complete austenitisation is not attained during heating; (3) hot stamping with a lower forming temperature, i.e., low-temperature hot stamping (LTHS); (4) advanced medium-Mn steels with lower austenitisation temperatures and their applicability in LTHS. Prospects for the further development of LTHS technology and the work required to achieve this are discussed.

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“…Stamping forming is currently the most convenient and effective technology in industrial product forming, and the mold is the core of this technology [1,2] . In the process of hot stamping, the design of the cooling water channel in the mold has a very important in uence on the forming of parts [3][4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Improved hole wall roughness and corrosion resistance of U-shaped hole prepared by casting

Cao

et al. 2021

Int J Adv Manuf Technol

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The corrosion resistance of the cooling water channel in the water-cooled mold has an important impact on the application of the mold. In this paper, the in uence of experimental temperature on roughness and corrosion resistance of U-shaped cooling channels prepared by casting is analyzed in detail. The results show that the experimental temperature increased from 998K to 1048K, the hole wall roughness of the Ushaped hole decreased from 83.264 to 76.287. However, the hole wall roughness increased with a further increase in temperature. Because the low experimental temperature will promote the formation of micro bulges and river ripples on the hole wall. However, with the temperature gradually increased, it will promote the aluminum matrix to react with the carbon ber, which will increase the roughness. The corrosion performance analysis results show that a reasonable experimental temperature is bene cial to reduce the roughness of the hole wall and improve the corrosion resistance of the cooling channel. When the roughness is large, the ravines on the rough surface are easy to be the starting point of corrosion. At the same time, it is easy to cause the aggregation of Si elements to the hole wall at high experimental temperature, which will also cause corrosion. As a result, reasonable experimental temperature plays an important role in improving the corrosion resistance of the U-shaped cooling channel.

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Microstructure evolution and enhanced performance of a novel Nb-Mo microalloyed medium Mn alloy fabricated by low-temperature rolling and warm stamping

Cited by 63 publications

References 32 publications

Effect of Rolling Temperature on Microstructure and Mechanical Properties of a Nb-Mo Microalloyed Medium Mn Steel

Effect of Rolling Temperature on Microstructure and Mechanical Properties of a Nb-Mo Microalloyed Medium Mn Steel

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

Improved hole wall roughness and corrosion resistance of U-shaped hole prepared by casting

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