Werkstofftechnische Anforderungen an Press-härtewerkzeuge am Beispiel der Werkzeugstähle X38CrMoV5-3, 30MoW33-7 und 60MoCrW28-8-4

Wilzer, Jens; Weber, Sebastian; Escher, C.; Theisen, W.

doi:10.3139/105.110237

Cited by 8 publications

(6 citation statements)

References 8 publications

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“…Previous work showed that thermal conductivity is not only influenced by chemical composition, but also strongly by heat treatment [9,10]. This influence is even greater on steels with a high volume fraction of precipitates, such as carbide-rich cold-work tool steels [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on phase structure and thermal conductivity of a copper-infiltrated steel

2015

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Infiltration of tool steels with copper is a suitable and cheap method to create dense parts using powder metallurgy. In this work, it is shown that the copper network that forms inside the steel skeleton during infiltration enhances the thermal conductivity of the resulting composite. The level of enhancement is dependent on the thermal conductivity of the copper phase and the volume fraction of copper. Multiple heat treatments of this composite revealed a strong dependency between the thermal conductivity of the composite and the solution state of Fe in the copper network. The latter is highly dependent on the heat-treated condition of the multi-phase material. Using infiltration, the thermal and electrical conductivity was increased from 21:3 to 50:1 Wm À1 K À1and from 2:5 to 7:7 lX À1 m À1 ; respectively, for aged steel-copper composite in comparison with original X245VCrMo9-4-4 steel. In addition, a model alloy that represents the copperphase network in the composite was manufactured. By measuring both, the thermal conductivity of this model alloy and the bulk steel, and comparing it to the data for the composite, different models for calculating the overall conductivity of the composite are discussed.

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Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on phase structure and thermal conductivity of a copper-infiltrated steel

2015

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“…Thermal conductivity of Mod 1 and 3 after tempering at 620 °C, which results in slightly higher hardness than in the case of the reference alloys, appears to be not as high as that of 1.2383, yet still considerably increased compared to 1.2367. The potential to improve thermal conductivity by tempering is indicated by the room temperature values of laboratory scale alloys at low tempering temperature, which were found to be at approximately 20 W mK −1 (however, room temperature thermal conductivity of 1.2367 in comparable condition was shown to be even lower) . This effect is caused by the precipitation of carbides during tempering at higher temperatures, which, in turn, is linked with depletion of alloying elements from the martensitic matrix.…”

Section: Resultsmentioning

confidence: 99%

“…Mainly focusing on thermal conductivity, detriments in terms of wear resistance and hardenability can occur, which revealed the necessity to find a balance between mechanical and physical properties. In consequence, new tool steel solutions featuring compromises in terms of properties were developed . Furthermore, the potential to influence physical properties of hot work tool steels by means of heat treatment was confirmed …”

Section: Introductionmentioning

confidence: 99%

“…Being a key property of hot stamping tool steels, wear resistance is frequently investigated. Such studies involve laboratory test setups, e.g., ASTM G65 at room temperature, or elevated temperatures, which inevitably include deviations in tribological system from real hot stamping tools. However, as they provide an easy way to determine and compare abrasive wear resistance of different alloys, they are frequently requested by automotive industry, e.g., ASTM G75 .…”

Section: Introductionmentioning

confidence: 99%

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Properties of Tool Steels for Application in Hot Stamping

Niederhofer

Eger

Schwingenschlögl

et al. 2019

steel research int.

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Hot stamped high-strength steel components for car bodies become increasingly important due to the need to save weight for multiple reasons such as fuel conservation regulations. Tribological systems in tools for hot stamping depend on process parameters and may include, e.g., mechanical and thermal loads as well as adhesive and abrasive wear. Furthermore, the process cycle time should be as short as possible due to economic reasons. Commonly used hot work tool steels mainly suffer from rather low wear resistance, whereas in terms of process cycle time, a high thermal conductivity is desired. Thus, solutions showing optimized combination of key properties for application in hot stamping such as wear resistance, high thermal conductivity, toughness, and hardening behavior need to be found. In this contribution, novel high thermal conductivity hot work tool steels, especially designed for application in hot stamping, are presented and some key properties are compared, e.g., to those of conventional hot work tool steels like 1.2367, which is commonly used in this application. Furthermore, tribological investigations are performed in laboratory tests according to ASTM G65 and G75 as well as a flat strip-drawing test setup using sheets of 22MnB5 under hot stamping conditions.

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“…The challenge in the design of new alloys is to fulfill all of these requirements in parallel. In recent years, the authors of this work and several other groups have worked intensively on the basics of thermal conductivities of heat-treatable steels to provide a fundamental understanding of the relationships between alloy composition, heat-treatment, microstructure, and thermo-physical properties [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Diffusion processes during cementite precipitation and their impact on electrical and thermal conductivity of a heat-treatable steel

et al. 2016

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The thermal conductivity of heat-treatable steels is highly dependent on their thermo-mechanical history and the alloying degree. Besides phase transformations like the martensitic c ! a 0 or the degree of deformation, the precipitation of carbides exerts a strong influence on the thermal conductivity of these steels. In the current work, thermal and electrical conductivity of a 0.45 mass% C steel is investigated during an isothermal heat treatment at 700 C and correlated with the precipitation kinetics of cementite. To include processes in the shortterm as well as in the long-term range, annealing times from 1 s to 200 h are applied. This investigation includes microstructural characterization, diffusion simulations, and electrical and thermal conductivity measurements. The precipitation of carbides is connected with various microstructural processes which separately influence the thermophysical properties of the steel from the solution state to the short-term and long-term annealing states. In the early stages of cementite growth, an interstitial-dominated diffusion reaction takes place (carbon diffusion in the metastable condition of local equilibrium non-partitioning). Afterwards, substitutional-dominated diffusion controls the kinetics of the reaction. The electrical and thermal conductivity increase differently during the two stages of the carbide precipitation. The increment is associated to the binding of alloying elements into the carbides and to the reduction of the distortion of the martensitic matrix. Both factors increase the electron density and reduce the electron and phonon scattering. The correlation of the precipitation kinetics and the thermophysical properties are of general interest for the design of heat-treatable steels.

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Werkstofftechnische Anforderungen an Press-härtewerkzeuge am Beispiel der Werkzeugstähle X38CrMoV5-3, 30MoW33-7 und 60MoCrW28-8-4

Cited by 8 publications

References 8 publications

Effect of heat treatment on phase structure and thermal conductivity of a copper-infiltrated steel

Effect of heat treatment on phase structure and thermal conductivity of a copper-infiltrated steel

Properties of Tool Steels for Application in Hot Stamping

Diffusion processes during cementite precipitation and their impact on electrical and thermal conductivity of a heat-treatable steel

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