Effect of tool temperature and punch speed on hot stamping of ultra high strength steel

Liu, Wei; Liu, Hongsheng; Xing, Zhongwen; Liu, Gang; Jin, Bao

doi:10.1016/s1003-6326(12)61757-9

Cited by 18 publications

(3 citation statements)

References 13 publications

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“…The factory cost has been increased by meeting these requirements. Hot stamping and cold die quenching process (HFQ®) [12] has been widely used in automotive industry because of its high production efficiency. Compared with the traditional hot forming process, the HFQ® process has greater advantages in terms of stamping speed and requirement for tool materials.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on formability of TC4 alloy in a novel multi-layer sheet hot stamping process

Yang

Wang

Zhou

2020

Int J Adv Manuf Technol

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In this study, a novel modified hot stamping process is proposed to prevent the heat loss of titanium alloy sheet during transferring and stamping. A technology which is two steel sheets clamping one titanium alloy sheet (the sandwich structure) to transfer and deform was used in the multi-layer sheet hot stamping process. The formability of TC4 alloy under the triple-layer sheet hot stamping condition was studied by means of experiment and numerical simulation. The influence of sheet temperature, stamping speed, and blank holder force on the depth and thickness uniformity of parts was analyzed. The results show that the deepdrawing depth of titanium alloy parts is improved and the thickness uniformity of parts is better by using the triple-layer sheet hot stamping process proposed in this paper. On the one hand, the flow stress of the TC4 alloy is low because of the less heat loss in the triple-layer sheet hot stamping process. On the other hand, the TC4 alloy sheet can be deformed better because of the changing of the friction situation of the titanium alloy sheet. And the contact force between titanium alloy sheet and steel sheet is less because of the protection of two steel sheet under the triple-layer sheet hot stamping condition. With the sheet temperature increasing, the deep-drawing depth of titanium alloy parts increases by 22.2% from 27 mm of 750°C to 33 mm of 900°C. Compared with the single-layer sheet hot stamping process, the stamping depth of titanium alloy parts obtained by the triple-layer sheet hot stamping process increases by 135.7% at 900°C, and the local thinning of titanium alloy sheet is improved. Due to strain rate strengthen and the uniform distribution of sheet temperature, the thickness uniformity of parts is improved with the increase of stamping speed. Based on the microstructure observation tests, it is can be seen that more equiaxed α phase of TC4 alloy parts can be obtained by the triple-layer sheet hot stamping process.

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on formability of TC4 alloy in a novel multi-layer sheet hot stamping process

Yang

Wang

Zhou

2020

Int J Adv Manuf Technol

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“…Therefore, the mechanism of the phase transformation of martensite during hot stamping must be studied for achieving ultra-high-strength materials. Finite element analysis is a common method of studying the phase change process and mechanism [5]. Wang et al [6] studied the effect of austenite's holding time on phase transformation by finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

Study on Phase Transformation in Hot Stamping Process of USIBOR® 1500 High-Strength Steel

Zhang

Zhu²,

et al. 2019

Metals

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Based on the Kirkaldy-Venugopalan model, a theoretical model for the phase transformation of USIBOR® 1500 high strength steel was established, and a graph of the phase transformation kinetics of ferrite, pearlite, and bainite were plotted using the software MATLAB. Meanwhile, with the use of the software DYNAFORM, the thermal stamping process of an automobile collision avoidance beam was simulated. The phase transformation law of USIBOR® 1500 high-strength steel during hot stamping was studied through a simulation of the phase transformation during the pressure holding quenching process. In combination with the continuous cooling transformation (CCT) curve, the cooling rate of quenching must be greater than 27 °C/s to ensure maximum martensite content in the final parts, and the final martensite content increases as the initial temperature of the sheet rises.

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“…Thus the UHSS is being increasingly used in automotive industry. To improve formability of UHSS sheet metal and reduce spring-back of the formed component, an innovative processing technology was presented [1,2]. In such hot stamping, the steel sheet is heated to a temperature in the austenite range.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pre-Heating Temperature on Microstructure and Properties of 22MnB5 Steel Hot Stamping

Liu

Gongzi

et al. 2014

AMR

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The hot stamping process of ultra high strength steel(UHSS) sheet is an innovative way to manufacture the components with a ultra high tensile strength. The sufficiency of martensitic transformation in formed component is affected by pre-heating temperature of blank directly. In this paper, experiments of heating UHSS blanks to 700°C, 800°C, 900°C and 1000°C were implemented to investigate the effect of pre-heating temperature on the formed component’s microstructure and mechanical properties. The results indicate that 900°C is the best pre-heating temperature for hot stamping process. The microstructure of formed component is all fine and uniform martensite. Meanwhile, tensile strength and vickers hardness raise up to 1580MPa and 450HV, respectively.

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Effect of tool temperature and punch speed on hot stamping of ultra high strength steel

Cited by 18 publications

References 13 publications

Numerical and experimental study on formability of TC4 alloy in a novel multi-layer sheet hot stamping process

Numerical and experimental study on formability of TC4 alloy in a novel multi-layer sheet hot stamping process

Study on Phase Transformation in Hot Stamping Process of USIBOR® 1500 High-Strength Steel

Effect of Pre-Heating Temperature on Microstructure and Properties of 22MnB5 Steel Hot Stamping

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