Effect of cooling path on the phase transformation of boron steel 22MnB5 in hot stamping process

Li, Ff F.; Fu, Ming; Lin, Jian Ping

doi:10.1007/s00170-015-7298-5

Cited by 18 publications

(23 citation statements)

References 18 publications

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“…The maximum value of emissivity can be found at 60°or 70°. The emissivity at 730 °C is higher than that at 220 °C, and this was explained by the change of Al-Si coating on the sample surface [14].…”

Section: Experimental Results and Emissivity Modelingmentioning

confidence: 89%

An Infrared Temperature Measurement Method for Hot Stamping Parts Considering Directional Emissivity

Gu¹,

Zhao²,

Wang³

et al. 2023

Atlantis Highlights in Materials Science and Technology

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Infrared temperature measurement technology is widely used in the detection of surface temperature distribution of hot stamping parts. However, the accurate infrared temperature measurement for complex parts is still a problem due to the deviation of emissivity. In this study, a novel directional emissivity calibration was proposed for 22MnB5 hot stamping steel. A mathematical model considering directional emissivity was established and verified. Based on the projection and interpolation method, the directional emissivity is assigned to each pixel in the thermograph shot by infrared thermal imager. Finally, a high measurement precision within ± 25 °C was achieved for temperature measurement on 22MnB5 hot stamping parts.

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Section: Experimental Results and Emissivity Modelingmentioning

confidence: 89%

An Infrared Temperature Measurement Method for Hot Stamping Parts Considering Directional Emissivity

Gu¹,

Zhao²,

Wang³

et al. 2023

Atlantis Highlights in Materials Science and Technology

Self Cite

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“…Cooling can be accelerated, reducing cycle time, by using tool steel with optimized thermal conductivity. 8…”

Section: Stamping Processingmentioning

confidence: 99%

Hot-stamped B-pillar for automotive driven by Lean 4.0

Silva

Camargo

Lovo

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Lean is applied in automobile companies to reduce lead time and waste through value stream mapping. Industry 4.0 is a process of industrial systems revolution in companies driven by digitalization and data-oriented techniques. The combination of both is called Lean 4.0. In this sense, the purpose of this paper is to attend Ultra-Light Steel Auto-body (ULSAB) automotive requirements through Lean 4.0 framework applied in the fabrication of B-pillar by hot stamping. Optimization algorithms are important to simulate different scenarios and interact with these processes. The proposal was developed in the case study by assessments based on semi-structured questionnaires, analysis of records and documents. The findings showed overall equipment effectiveness (OEE) was increased by 41.5%. The contribution of this work was to meet ULSAB automotive requirements for hot stamping process by reducing vehicle weight while increasing structural strength.

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“…The ultra-high strength of hot-stamped steel is attributed to its fully martensitic microstructure. According to previous research, the final mechanical properties and microstructures of hot-stamped steel were greatly influenced by cooling conditions [7][8][9]. For a continuous cooling process, there is a critical cooling rate to obtain a fully martensitic microstructure [4,10,11].…”

Section: Introductionmentioning

confidence: 97%

“…For a continuous cooling process, there is a critical cooling rate to obtain a fully martensitic microstructure [4,10,11]. However, in the industrial hot stamping process, the steel sheet is cooled at varying cooling rates [9], decreasing from the value more than 60 • C/s to less than 10 • C/s. A slow cooling rate below martensite start (M s ) temperature facilitates the formation of carbides, causing auto-tempering [12], reducing quenched hardness [13] and strength [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Path on Microstructures and Hardness of Hot-Stamped Steel

Yang

et al. 2020

Metals

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The final mechanical properties of hot-stamped steel are determined by the microstructures which are greatly influenced by the cooling process after hot stamping. This research studied the effect of the cooling path on the microstructures and hardness of 22MnB5 hot-stamped steel. The cooling path was divided into continuous and discontinuous (primary and secondary) processes. After cooling, the Vickers hardness along the thickness of the specimens was measured. The results indicate that, for a continuous cooling process, there was a critical cooling rate of 25 °C/s to obtain fully martensitic microstructure. For the discontinuous cooling process, the slower was the cooling rate, the higher was the degree of auto-tempering that occurred, and the greater was the amount of carbides that formed, regardless of the primary or secondary cooling rate. When the cooling rate was lower than the critical value, a higher primary cooling rate suppressed the auto-tempering of lath martensite and increased the quenched hardness. By contrast, the hardness was not sensitive to the cooling rate when it exceeded the critical value.

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Effect of cooling path on the phase transformation of boron steel 22MnB5 in hot stamping process

Cited by 18 publications

References 18 publications

An Infrared Temperature Measurement Method for Hot Stamping Parts Considering Directional Emissivity

An Infrared Temperature Measurement Method for Hot Stamping Parts Considering Directional Emissivity

Hot-stamped B-pillar for automotive driven by Lean 4.0

Effect of Cooling Path on Microstructures and Hardness of Hot-Stamped Steel

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