A review on hot stamping

Karbasian, Hossein; Tekkaya, A. Erman

doi:10.1016/j.jmatprotec.2010.07.019

Cited by 1,462 publications

(782 citation statements)

References 30 publications

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“…A higher thermal conductivity reduces temperature gradients at the surface of a tool, for instance, during die casting, and thus the stress amplitude induced by thermal cycling [5,6]. In the context of press hardening, the dominant reason for degradation is not thermal fatigue, but abrasive wear of the tool surface and sticking of workpiece/coating material [7][8][9]. However, a high thermal conductivity is also beneficial for press hardening as it determines the cooling rate of a metal blank from the austenitization temperature and thereby directly influences cycle time and productivity [3,10].…”

Section: Introductionmentioning

confidence: 99%

The influence of heat treatment and resulting microstructures on the thermophysical properties of martensitic steels

et al. 2013

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This research study investigates the influence of heat treatment on the thermal conductivities of three different tool steels at room temperature. The results reveal not only that tempering plays a decisive role in their thermophysical properties, but also that the changes in thermal conductivity due to heat treatment are dependent on the degree of alloying. Isobaric heat capacities c p are found to be less dependent on heat treatment than thermal diffusivities a. The results are discussed with respect to the resulting microstructures and, for high-tempered conditions, under consideration of Calphad calculations. The results are relevant for the thermal design of tools, in particular, for tailored tempering of tools used for press hardening.

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Section: Introductionmentioning

confidence: 99%

The influence of heat treatment and resulting microstructures on the thermophysical properties of martensitic steels

et al. 2013

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“…The curves in Figure 10 and the data in Table 3 show that, the lower austenitization temperature is helpful for manufacturing the structural components with distributed properties by introducing a thin air gap between the tools and steel plate [26], or using the tool materials with the lower thermal conductivity [27], as the austenite attained at the lower austenitization temperature is particularly susceptible to the cooling rate [28]. The fracture morphology of sample austenitized at 870 °C, 900 °C, 930 °C or 960 °C is shown in Figure 11.…”

Section: Stress and Strainmentioning

confidence: 99%

Research on hot stamping for a typical part of B1500HS boron steel using experiment and numerical simulation methods

Tang

Lin

et al. 2016

MATEC Web Conf.

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Abstract. In the paper, a typical part of B1500HS boron steel was formed using the hot stamping tools, and the effect of austenitization temperature on the microstructure and mechanical properties of B1500HS steel was studied by the experiment and finite element methods. The results show that, the temperature of steel plate has a significant effect on the temperature of hot stamping tools, and the temperature of punch rises at a faster speed than that of die in the hot stamping process. The austenitization temperature and time both have significant effects on the size of martensite, but have not obvious effects on the hardness. The cooling rate of steel plate has a significant effect on the tensile strength when the austenitization temperature is 870. The fracture of sample austenitized at 870 or 900 is the dimple, the fracture of sample austenitized at 930 or 960 is the mixture of quasicleavage and dimple.

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“…In the hot stamping process this phenomenon is even more sensitive for two reasons: the deformation takes place at high temperatures in the metastable austenitic phase with the face-centered cubic (FCC) structure, resulting in changes to the mechanical properties of the material. Also, it is due to the fact that the material is hot formed in a facecentered cubic (FCC) structure and simultaneously quenched to room temperature, in order to obtain a component with good dimensional accuracy and high mechanical resistance 1 . In this case the necking causes a sheet thickness reduction generating a gap between the surfaces of the stamped component and the stamping die, thus affecting the efficiency of heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Effect of Necking Behavior and of Gap Size on the Cooling Rate in Hot Stamping

et al. 2016

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In this study, a tailored die quenching experimental method using low closing pressures and an aluminum flat die was developed in order to evaluate the effects of the gap size on the cooling rate in the hot stamping process of a 22MnB5 steel grade. Initially, the necking behavior in hot stamping was investigated by deforming the specimens to different strain levels and subjecting them to quenching in order to assess this effect on the gap profile formed between the die surface and the sample. Next, a controlled gap was promoted in the central region of the aluminum cooler using aluminum spacers (simulating the gap) with different thickness (0.06/0.15/0.40/0.70mm). Then, its effects on the cooling rate and on the hardness after quenching were evaluated. The results showed that the cooling rate is very susceptible to gap size, that the ideal situation occurred when there was no gap, good heat transfer and higher average cooling rates of 120 o C/s were achieved, and that when the gap was wider than 0.20mm the average cooling rates were lower than 20 o C/s, consequently below the critical 22MnB5 steel cooling for quenching, which is 28 o C/s.

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A review on hot stamping

Cited by 1,462 publications

References 30 publications

The influence of heat treatment and resulting microstructures on the thermophysical properties of martensitic steels

The influence of heat treatment and resulting microstructures on the thermophysical properties of martensitic steels

Research on hot stamping for a typical part of B1500HS boron steel using experiment and numerical simulation methods

Effect of Necking Behavior and of Gap Size on the Cooling Rate in Hot Stamping

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