Intercomparison of Thermophysical Property Measurements on an Austenitic Stainless Steel

Rudtsch, Steffen; Ebert, Hans-Peter; Hemberger, F.; Barth, Gerald; Brandt, Rüdiger; Groß, Ulrich; Hohenauer, Wolfgang; Jaenicke-Roessler, K.; Kaschnitz, Erhard; Pfaff, E.M.; Pößnecker, W.; Pottlacher, Gernot; Rhode, Magnus; Wilthan, Boris

doi:10.1007/s10765-005-5582-6

Cited by 19 publications

(6 citation statements)

References 4 publications

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“…In Fig. 7 the present results are compared with those reported by Solter and with the previously reported thermal diffusivity of three austenitic stainless steels with different chromium and nickel content: ISO 1.4970 (or X10NiCrMoTiB15-15), containing 15 wt% Cr and 15 wt% Ni [32], AISI 310, containing 25 wt% Cr and 20 wt% Ni [33], and AISI 304, nominally containing 19 wt% Cr and 9 wt% Ni [34]. 11 With the following composition (weigth %): C 0.32, Si 0.14, Mn 0.61, Cr 0.93, Mo 0.46, Ni 2.5.…”

Section: Discussionsupporting

confidence: 51%

Thermal diffusivity measurements of metastable austenite during continuous cooling

Matteis¹,

Campagnoli

Firrao

et al. 2008

International Journal of Thermal Sciences

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The thermal diffusivity of the metastable undercooled austenite is relevant for the quantitative analysis of the carbon and low-alloy steel quench. The standard laser-flash method requires prior thermal equilibrium between the sample and the furnace, which may not be possible to achieve without allowing the metastable phase to transform. Nevertheless, depending upon the steel's hardenability, the thermal transient due to a laser pulse may be much shorter than a cooling transient sufficiently steep to prevent the transformation of the austenite. In one such case, flash measurements were performed during continuous sample cooling and the thermal diffusivity of the metastable austenite was determined by using an extension of the standard analytical model. The adopted analytical model and data reduction procedure are described and the limitations and uncertainties of this method are discussed, also with the aid of a non-linear numerical simulation. The measured thermal diffusivity of the undercooled low-alloy austenite decreases linearly from 5.4 · 10 −6 m 2 s −1 at 1133 K to 4.3 · 10 −6 m 2 s −1 at 755 K; this trend is in broad agreement with one previous set of measurements upon a low-alloy undercooled austenite and with a large number of previous standard measurements upon stable (high-alloy) austenitic stainless steels.

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Section: Discussionsupporting

confidence: 51%

Thermal diffusivity measurements of metastable austenite during continuous cooling

Matteis¹,

Campagnoli

Firrao

et al. 2008

International Journal of Thermal Sciences

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“…Its thermal diffusivity values are the lowest ones from room temperature up to the Curie temperature of the ferritic steels, while after this point they result to be closer to the values measured for the other steels. The increase of the thermal diffusivity values with temperature observed in the TWIP steel was previously observed also in some other high-alloy austenitic steels [17][18][19] and in low-alloy metastable austenite [6,20].…”

Section: Resultssupporting

confidence: 73%

Thermal Diffusivity of Traditional and Innovative Sheet Steels

Campagnoli

Matteis

Mortarino

et al. 2010

DDF

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The low carbon steels, used for the production of car bodies by deep drawing, are gradually substituted by high strength steels for vehicle weight reduction. The drawn car body components are joined by welding and the welded points undergo a reduction of the local tensile strength. In developing an accurate welding process model, able to optimized process parameters and to predict the final local microstructure, a significant improvement can be given by the knowledge of the welded steels thermal diffusivity at different temperatures. The laser-flash method has been used to compare the thermal diffusivity of two traditional deep drawing steels, two high strength steels already in common usage, i.e. a Dual Phase (DP) steel and a TRansformation Induced Plasticity (TRIP) steel, and one experimental high-Mn austenitic TWIP (Twinning Induced Plasticity) steel. The low carbon steels, at low temperatures, have a thermal diffusivity that is 4-5 times larger than the TWIP steel. Their thermal diffusivity decreases by increasing temperature while the TWIP steel shows an opposite behaviour, albeit with a lesser slope, so that above 700°C the TWIP thermal diffusivity is larger. The different behaviour of the TWIP steel in respect to the ferritic deep drawing steels arises from its non ferro-magnetic austenitic structure. The DP and TRIP steels show intermediate values, their diffusivity being lower than that of the traditional deep drawing steels; this latter fact probably arises from their higher alloy content and more complex microstructure.

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“…Thermal diffusivity is independent of volume expansion and can therefore also be measured for samples with rectangular cross sections. Additional information to our procedures is given in several papers published by our workgroup on different steels and Ni-based alloys [9][10][11][12][13][14][15][16][17][18].…”

Section: Evaluation Of Thermophysical Propertiesmentioning

confidence: 99%

Thermophysical Properties of Five Industrial Steels in the Solid and Liquid Phase

2017

Self Cite

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The need for characterization of thermophysical properties of steel was addressed in the FFG-Bridge Project 810999 in cooperation with our partner from industry, Böhler Edelstahl GmbH & Co KG. To optimize numerical simulations of production processes such as plastic deformation or remelting, additional and more accurate thermophysical property data were necessary for the group of steels under investigation. With the fast ohmic pulse heating circuit system and a commercial hightemperature Differential Scanning Calorimeter at Graz University of Technology, we were able to measure the temperature-dependent specific electrical resistivity and specific enthalpy for a set of five high alloyed steels: E105, M314, M315, P800, and V320 from room temperature up into the liquid phase. The mechanical properties of those steels make sample preparation an additional challenge. The described experimental approach typically uses electrically conducting wire-shaped specimen with a melting point high enough for the implemented pyrometric temperature measurement. The samples investigated here are too brittle to be drawn as wires and could only be cut into rectangular specimen by Electrical Discharge Machining. Even for those samples all electrical signals and the temperature signal can be recorded with proper alignment of the pyrometer. For each material under investigation, a set of data including chemi- cal composition, solidus and liquidus temperature, enthalpy, electrical resistivity, and thermal diffusivity as a function of temperature will be reported.

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Intercomparison of Thermophysical Property Measurements on an Austenitic Stainless Steel

Cited by 19 publications

References 4 publications

Thermal diffusivity measurements of metastable austenite during continuous cooling

Thermal diffusivity measurements of metastable austenite during continuous cooling

Thermal Diffusivity of Traditional and Innovative Sheet Steels

Thermophysical Properties of Five Industrial Steels in the Solid and Liquid Phase

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