Quantification of methods used in field metallography using the example of quality assurance measures for a circular economy for high-alloy steels

Kronenberg, Philipp; Wieczorek, L.; Weber, Sebastian; Röttger, Arne

doi:10.1515/pm-2022-0034

Cited by 4 publications

(3 citation statements)

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“…Regarding the high-speed steel M2, hard phases of type M 2 C, M 6 C and MC were present in a fully martensitic matrix. The cold-work tool steel D2 is characterized by eutectic carbides of the type M 7 C 3 , as shown by Kronenberg et al [ 7 ]. As already mentioned, the larger eutectic carbides are aligned parallel to the primary rolling (RD) direction, which can be seen clearly in the SEM image [ 7 ].…”

Section: Resultsmentioning

confidence: 99%

“…The manufacturing process of the machine circular knife determines the microstructure—or, more specifically, the carbide orientation—of the woodturning chisels. The chisels can be taken out along or across to the primary rolling direction [ 7 ]. As examined in previous works, the relative general orientation of these microstructural constituents influences critical macroscopical properties related to their system-related performance, such as abrasive wear resistance and maximum service temperature [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Impact of Thermophysical Properties of High-Alloy Tool Steels on Their Performance in Re-Purposing Applications

et al. 2022

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Resource efficiency and circularity in the context of sustainability are rapidly gaining importance in the steel industry. One concept regarding circular economy is “repurposing”. In the context of this work, worn-out machine circular knives are used to produce new chisels for woodturning. The chisels can be extracted parallel or perpendicular to the rolling direction of the primary production process, resulting in an associated carbide orientation of the repurposed tool. The rolling direction, and therefore carbide alignment, will influence the wear resistance and the thermophysical properties, whereby the thermal conductivity will determine the temperatures at the tip of the chisel. Therefore, the thermal conductivity was investigated with the dynamic measurement method, where the specific heat capacity, density and thermal diffusivity of the extracted chisels and industrial reference chisels were measured separately. Moreover, the electrical resistivity was measured in order to calculate the electronic thermal conductivity according to the Wiedemann–Franz–Lorenz law. It was shown that all of these parameters exhibited different degrees of variability with rising temperature. In a detailed analysis, the thermal diffusivity could be identified as an essential parameter of thermal conductivity. By taking two conventional chisels with different chemical compositions and heat treatments into account, it can be seen that the microstructure determines the thermophysical properties. Considering the carbide direction, the chisels that were extracted parallel to the rolling direction showed differing thermophysical properties. Therefore, the carbide orientation is shown to play a significant role regarding the heat dissipation at the cutting edge, because differences, especially in the electronic thermal conductivity in the parallel and perpendicular extracted chisels, can be measured. In addition to the wear resistance factor, the thermal conductivity factor now also supports the removal of the repurposed chisels parallel to the rolling direction.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Thermophysical Properties of High-Alloy Tool Steels on Their Performance in Re-Purposing Applications

et al. 2022

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“…The formed sheets have anisotropic properties due to their solidification from the melt, characterized by randomly orientated grains. This anisotropy is to be reduced by cross-rolling processes (Kronenberg et al, 2022). After cross rolling, laser cutting separates circular blanks from the sheet.…”

Section: Linear Production Routementioning

confidence: 99%