Funktionsoptimierte Strukturbauteile im Presshärtprozess

Merklein, Marion; Stöhr, Thomas; Svec, Thomas; Wieland, Michael

doi:10.1007/bf03223625

Cited by 10 publications

(10 citation statements)

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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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“…At present, the proportion of ultrahigh‐strength materials in automobiles is about 28% . Due to their low formability and high strength, ultrahigh‐strength materials cannot be produced using cold forming devices . Therefore, hot forming processes like hot stamping are used to produce automotive components which reach a tensile strength of about 1500 MPa .…”

Section: Introductionmentioning

confidence: 99%

“…[1] Due to their low formability and high strength, ultrahigh-strength materials cannot be produced using cold forming devices. [2] Therefore, hot forming processes like hot stamping are used to produce automotive components which reach a tensile strength of about 1500 MPa. [2][3][4] In case of direct hot stamping, a steel sheet is austenitized in a continuous annealing furnace, then it is transferred to the forming press and subsequently formed and quenched in the closed forming tool.…”

Section: Introductionmentioning

confidence: 99%

“…[2] Therefore, hot forming processes like hot stamping are used to produce automotive components which reach a tensile strength of about 1500 MPa. [2][3][4] In case of direct hot stamping, a steel sheet is austenitized in a continuous annealing furnace, then it is transferred to the forming press and subsequently formed and quenched in the closed forming tool. [4] To improve the efficiency of hot stamping, it is essential to know the mechanical properties of the tool steel as well as its physical properties.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Temperature and Tempering Conditions on Thermal Conductivity of Hot Work Tool Steels for Hot Stamping Applications

Hafenstein

Werner

Wilzer

et al. 2015

steel research int.

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The knowledge of thermal conductivity is essential for improving and designing tools for hot working applications like hot stamping and high‐pressure aluminum die casting. This study investigates the influence of alloying composition and heat treatment on thermal conductivity of two different hot work tool steels in the temperature range between 20 and 500 °C. Thermal conductivity was determined with an indirect measurement by using the dynamic method. The thermal conductivity of the two tool steels was found to be dependent on the amount of alloying elements, heat treatment condition, and operating temperature. In the regime of hot stamping applications, i.e for service temperatures below 200 °C, thermal conductivity increases with temperature for both steels irrespective of their heat treatment condition. In applications in which tools are subjected to temperatures above 200 °C (such as high‐pressure die casting operations), thermal conductivity of the steels decreases as tool temperature increases.

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“…[1][2][3][4] For some applications also physical properties, particularly thermal conductivity, are of particular interest for tool design. In many processes, e.g.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of advanced TiC reinforced metal matrix composites for polymer processing applications

Wilzer

Windmann

Weber

et al. 2013

Journal of Composite Materials

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Tools used for fabricating polymers are often required to have low thermal conductivities, e.g. for pelletizing, because this lowers the risk of the polymer nozzle being obstructed by molten polymer solidifying as it exits. Latterly, advanced corrosion and wear resistant metal matrix composites (MMCs) are used for pelletizing tools. Therefore, with respect to polymer processing it is important to know how the thermal conductivity of MMC gets influenced by hard phase and metal matrix contribution. In this study, the thermal conductivity of a TiC reinforced corrosion and wear resistant MMC gets analyzed. Especially the influence of chemical interdiffusion between TiC and metal matrix on the resulting thermal conductivity gets analyzed. It is shown that changes in the chemical composition lead to distinct decrease in thermal conductivity of the TiC which has to be considered when MMC thermal conductivities have to be examined.

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Funktionsoptimierte Strukturbauteile im Presshärtprozess

Cited by 10 publications

References 0 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

Influence of Temperature and Tempering Conditions on Thermal Conductivity of Hot Work Tool Steels for Hot Stamping Applications

Thermal conductivity of advanced TiC reinforced metal matrix composites for polymer processing applications

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