High-Throughput Exploration of Evolutionary Structural Materials

Ellendt, N.; Mädler, Lutz

doi:10.3139/105.110345

Cited by 36 publications

(21 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For the establishment of a novel development process of new structural materials within the Collaborative Research Center "Farbige Zustände" (CRC 1232), micro samples are used for a costand resource-efficient material variation [15,16]. The mass of a conventional flat tensile specimen (5.37 g) is equal to the mass of 1315 spherical micro samples ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Short-Term Characterization of Spherical 100Cr6 Steel Samples Using Micro Compression Test

Sonnenberg

Clausen

2020

Materials

View full text Add to dashboard Cite

For the establishment of a novel development process of new structural materials, short-term characterization methods capable of testing hundreds of spherical micro samples are needed. This paper introduces a compression test on spherical micro samples as a short-term characterization method to investigate the elastic-plastic deformation behavior. To demonstrate the potential of this newly developed method, the micro compression test is performed with a maximum loading of 300 N on 100Cr6 (AISI 52100 bearing steel) samples, with a diameter of 0.8 mm, in 15 different heat treatment conditions. The austenitizing temperature is varied between 800 and 1150 °C. Tempering of the samples is carried out in a differential scanning calorimetry process with temperatures of 180, 230 and 300 °C. Out of force-displacement curves and stress-strain relations, so-called descriptors (characteristic values) which are sensitive to the applied heat treatment can be extracted. The change of mechanical properties due to heat treatment and the resulting microstructure is presented by the trend of a stress descriptor in dependence of austenitizing and annealing temperature, which can be compared to the trend of the tensile strength as a material property obtained by conventional tensile tests. The trend of the descriptor determined in the compression test on spherical samples indicates the validity of this approach as a short-term characterization method.

show abstract

Section: Introductionmentioning

confidence: 99%

Short-Term Characterization of Spherical 100Cr6 Steel Samples Using Micro Compression Test

Sonnenberg

Clausen

2020

Materials

View full text Add to dashboard Cite

show abstract

“…The diversity of technological development requires a constant search for new materials with defined properties. In order to accelerate ample and expansive studies of various metal compositions and structuring treatments, a highthroughput investigation of spherical micro samples is currently considered [1]. The investigation of micro samples results in descriptors, which are connected with the mechanical properties of the macro materials [2].…”

Section: Introductionmentioning

confidence: 99%

Uncertainty and Resolution of Speckle Photography on Micro Samples

et al. 2020

View full text Add to dashboard Cite

The efficient development of new materials with defined properties requires fast methods of testing low volumes of material, such as a high-throughput investigation of spherical metallic micro samples with varying compositions and structuring treatments. A classical material testing method for macro samples, the tensile test cannot be employed for analyzing the mechanical properties of spherical samples with diameters below 1 mm since there are currently no methods for holding and stretching them. A combination between the incremental electrohydraulic extrusion as stress actuation unit and the speckle photography as strain measuring method is presented for obtaining the required mechanical characteristics. Positive longitudinal strain is generated at stepwise extrusion through < 1 mm wide forming channels using a liquid punch and the deformation is observed in situ after each forming step at the interface between the micro sample and a transparent window integrated into the forming die. The occurring local strain fields with a lateral extension down to 100 µm and high gradients require displacement measurements with high lateral resolution over a large range of local dislocations between 0.1 and > 10 µm. It is unknown, whether the speckle strain measuring method is able to provide the necessary low uncertainty for the required resolution in the whole measuring range. Therefore, theoretical and experimental investigations of the deformation measurability using the speckle correlation method are presented, showing that local displacements up to 10 µm can be measured with a spatial resolution between 3 and 10 µm depending on the displacement size. The dominant effect influencing the measurement uncertainty for displacements at this high spatial resolution is the speckle noise, resulting into measurement uncertainties of less than 100 nm. Hence, speckle photography is shown to be applicable for tensile test on micro samples.

show abstract

“…Subsequently, the obtained microstructure states and associated micro-properties are characterized, up-scaled to macro level and valued. By means of machine learning and heuristic methods, the experimental plans are refined and the experimental procedure is continued until, finally, a novel material with the desired properties is found [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies regarding DSC measurements on steels can be found in the literature, e.g., concerning the determination of martensite decay [4]. In the case of aluminum alloys, extensive work has already been carried out on precipitation and dissolution behavior using DSC from Keßler et al [3], in which methods for producing continuous cooling precipitation diagrams, as well as continuous heating dissolution diagrams, were developed. Measuring speed, and thus sample throughput, can be increased using non-equilibrium heating rates.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Evaluation of Calorimetric Descriptors for the Suitability for Evolutionary High-Throughput Material Development

Toenjes

Sonnenberg

Plump

et al. 2019

Metals

View full text Add to dashboard Cite

A novel method for evolutionary material development by using high-throughput processing is established. For the purpose of this high-throughput approach, spherical micro samples are used, which have to be characterized, up-scaled to macro level and valued. For the evaluation of the microstructural state of the micro samples and the associated micro-properties, fast characterization methods based on physical testing methods such as calorimetry and universal microhardness measurements are developed. Those measurements result in so-called descriptors. The increase in throughput during calorimetric characterization using differential scanning calorimetry is achieved by accelerating the heating rate. Consequently, descriptors are basically measured in a non-equilibrium state. The maximum heating rate is limited by the possibility to infer the microstructural state from the calorimetric results. The substantial quality of the measured descriptors for micro samples has to be quantified and analyzed depending on the heating rate. In this work, the first results of the measurements of calorimetric descriptors with increased heating rates for 100Cr6 will be presented and discussed. The results of low and high heating rates will be compared and analyzed using additional microhardness measurements. Furthermore, the validation of the method regarding the suitability for the evolutionary material development includes up-scaling to macro level and therefore different sample masses will be investigated using micro and macro samples during calorimetry.

show abstract

High-Throughput Exploration of Evolutionary Structural Materials

Cited by 36 publications

References 36 publications

Short-Term Characterization of Spherical 100Cr6 Steel Samples Using Micro Compression Test

Short-Term Characterization of Spherical 100Cr6 Steel Samples Using Micro Compression Test

Uncertainty and Resolution of Speckle Photography on Micro Samples

Measurement and Evaluation of Calorimetric Descriptors for the Suitability for Evolutionary High-Throughput Material Development

Contact Info

Product

Resources

About