Temperature-dependent thermal conductivities of non-alloyed and high-alloyed heat-treatable steels in the temperature range between 20 and 500 °C

Wilzer, Jens; Küpferle, Jakob; Weber, Sebastian; Theisen, W.

doi:10.1007/s10853-014-8183-6

Cited by 11 publications

(14 citation statements)

References 39 publications

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“…With respect to the temperature dependence, previous investigations showed that for low‐ and non‐alloyed steels thermal conductivity decreases with temperature whereas it increases for high‐alloyed steels . The current analysis gives a more precise result.…”

Section: Resultsmentioning

confidence: 62%

“…With this assumption, the effective thermal conductivity λ eff of composites can be simplified to Equation 9

λ_{eff} = λ_{normalm} \frac{1 - v_{normald}}{1 + 0, 5 \cdot v_{normald}}

According to previous investigations, the tempered microstructure of the steels C45 and X42Cr13 contains 6 and 15 vol.% tempering carbides, respectively . Therefore, for a given λ m the effective thermal conductivity is expected to decrease down to 90% and 80% of λ m .…”

Section: Resultsmentioning

confidence: 97%

“…The question rises which microstructural effects are responsible for this behavior. Previous investigations showed that during tempering of the as‐quenched condition of the C45 and X42Cr13 carbides precipitate from the supersaturated martensitic structure, which have a Feret diameter smaller than 1 μ m …”

Section: Resultsmentioning

confidence: 99%

“…In previous publications, it is mentioned that the precipitation of tempering carbides leads to a reduction of scattering sources, which are in solid solution . During tempering carbon starts to form carbides, which can incorporate a significant amount of alloying elements.…”

Section: Resultsmentioning

confidence: 99%

“…Previous investigations have shown that tempering of martensitic steels has a significant influence on the thermal conductivity at room temperature . Furthermore, the temperature dependence of thermal conductivity differs between low‐alloyed and high‐alloyed martensitic steels …”

Section: Introductionmentioning

confidence: 99%

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Influence of Alloying Elements, Heat Treatment, and Temperature on the Thermal Conductivity of Heat Treatable Steels

Wilzer¹,

Küpferle

Weber

et al. 2014

steel research int.

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The thermal conductivity of heat treatable martensitic steels plays an important role for many industrial applications. In case of hot stamping, the thermal conductivity of forging tools determines not only the product quality but also the productivity. Hence, the aim of ongoing developments is to increase the thermal conductivity of tool steels for several industrial applications. Therefore, it is highly beneficial to know how thermal conductivity is influenced by alloying elements, heat treatment, and temperature. This work deals with the thermal conductivity of non‐alloyed heat treatable steel C45 and high‐alloyed corrosion resistant steel X42Cr13 in the as‐quenched and in the tempered condition. Additionally, the influence of dislocations on thermal conductivity is analyzed using commercially pure iron (Armco‐Iron) in the annealed and in the cold‐rolled condition. The results reveal that tempering affects both the electronic and the phononic contribution to thermal conductivity. Furthermore, due to the high chromium content, the thermal conductivity of steel X42Cr13 increases with temperature, which can be traced back to the electronic contribution. These results are useful for the development and improvement of tool steels, when the thermal conductivity of tools is not only a property but also a process parameter.

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Section: Resultsmentioning

confidence: 62%

“…With this assumption, the effective thermal conductivity λ eff of composites can be simplified to Equation 9

λ_{eff} = λ_{normalm} \frac{1 - v_{normald}}{1 + 0, 5 \cdot v_{normald}}

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Alloying Elements, Heat Treatment, and Temperature on the Thermal Conductivity of Heat Treatable Steels

Wilzer¹,

Küpferle

Weber

et al. 2014

steel research int.

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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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Normal spectral emissivity and heat capacity at constant pressure of Fe–Ni melts

2017

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Temperature-dependent thermal conductivities of non-alloyed and high-alloyed heat-treatable steels in the temperature range between 20 and 500 °C

Cited by 11 publications

References 39 publications

Influence of Alloying Elements, Heat Treatment, and Temperature on the Thermal Conductivity of Heat Treatable Steels

Influence of Alloying Elements, Heat Treatment, and Temperature on the Thermal Conductivity of Heat Treatable Steels

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

Normal spectral emissivity and heat capacity at constant pressure of Fe–Ni melts

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