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Measurement of thermophysical properties of NIST SRM 1155a (Cr18-Ni12-Mo2)

Published

Author(s)

Peter Pichler, Brian Simonds, Jeffrey W. Sowards, Gernot Pottlacher

Abstract

SRM 1155a is an AISI 316 stainless steel (Cr18-Ni12-Mo2) and Standard Reference Material (SRM) intended for use with test methods for elemental analysis. At the National Institute of Standards and Technology (NIST) in Boulder, Colorado dynamic absorptance of light with 1070 nm wavelength on the SRM 1155a is measured. Knowing absorptance processes of high-irradiance lasers on metal surfaces is of great importance for industrial applications like laser welding, cutting or additive manufacturing. As nowa- days industrial processes initially are simulated with computer programs, the knowledge of thermophysical data of the materials used as input data are of profound interest for industry and academia. The Thermo- and Metalphysics group at Graz University of Technology is specialized on measuring thermo- physical properties of high-melting metals and alloys in the liquid phase. With the help of our ohmic pulse-heating system, an apparatus, in which wire- shaped samples are heated, by distributing high current pulses over the sample, from room temperature up until melting and throughout the complete liquid phase up until vaporization, many temperature dependent properties can be measured. The electrical resistivity, enthalpy, density and thermal expansion as functions of temperature are measured directly. The great advantage of the pulse-heating apparatus is the very short timescale of around 50 s per experiment, denying a collapse of the liquid wire due to gravitational forces, as well as preventing any chemical reactions of the hot liquid metal with its surroundings. Additionally a dynamic scanning calorimeter (DSC) is available at Graz University of Technology to measure speci c heat capacity from room temperature up to around 1400 K.
Citation
Journal of Materials Science

Keywords

Thermophysical properties, stainless steel, ohmic pulse-heating, dynamic scanning calorimetry, enthalpy, density, electrical resistivity

Citation

Pichler, P. , Simonds, B. , Sowards, J. and Pottlacher, G. (2019), Measurement of thermophysical properties of NIST SRM 1155a (Cr18-Ni12-Mo2), Journal of Materials Science, [online], https://doi.org/10.1007/s10853-019-04261-6, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=928362 (Accessed May 30, 2024)

Issues

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Created December 8, 2019, Updated October 12, 2021