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Eberhard Kerscher

Bio: Eberhard Kerscher is an academic researcher from Kaiserslautern University of Technology. The author has contributed to research in topics: Fatigue limit & Fracture mechanics. The author has an hindex of 16, co-authored 97 publications receiving 1000 citations. Previous affiliations of Eberhard Kerscher include Karlsruhe Institute of Technology & Daimler AG.


Papers
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TL;DR: In this paper, a mechanism for the formation of a fine granular area in high-strength steels generated by a very high number of cycles to failure is proposed, where the crack initiation and propagation mechanism is not fully understood.

178 citations

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TL;DR: In this paper, a deformation mechanism is proposed with the help of experimental observations and finite-element simulation, which demonstrates that stress concentrations occur around the precipitates, which promotes a heterogeneous stress distribution and the formation of multiple shear bands.

78 citations

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TL;DR: In this article, the influence of different inclusion types on the crack initiation in the very high cycle fatigue regime was clarified, in which runout specimens were tested repeatedly with higher stress amplitudes until failure occurred.

77 citations

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TL;DR: In this paper, the role of the microstructure during the fatigue crack propagation has been analyzed on the basis of the relationships between grain misorientations and grain boundaries by Electron Backscatter Diffraction.
Abstract: Nanostructured bainite is not a novel laboratory-scale steel anymore and the interest on the commercial production of these microstructures by steelmakers and end-users is now conceivable. These microstructures are achieved through the isothermal transformation of high-carbon high-silicon steels at low temperature, leading to nanoscale plates of ferrite with thickness of 20–40 nm and retained austenite. Nanostructured bainitic steels present the highest strength/toughness combinations ever recorded in bainitic steels (2.2 GPa/40 MPa m 1/2 ) and the potential for engineering components is alluring. However, fatigue properties, responsible of the durability of a component, remain to be examined. In order to understand the role of the microstructure during the fatigue crack propagation, the crack path in three nanoscale bainitic structures has been analysed on the basis of the relationships between grain misorientations and grain boundaries by Electron Backscatter Diffraction. Active slip systems in bainitic ferrite and crack deflection at grain boundaries have been identified, while retained austenite is cast doubt on its role.

68 citations

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TL;DR: In this article, the effect of multiple jet passes and other parameters namely feedrate and pressure in waterjet peening of austenitic stainless steel 304 was analyzed and a reverse effect on the subsurface hardness was found for the feedrate.
Abstract: The present study addresses the effect of multiple jet passes and other parameters namely feedrate and pressure in waterjet peening (WJP) of austenitic stainless steel 304. An analysis of surface integrity was used to evaluate the performance of different parameters in the WJP process. An increase in the number of jet passes as well as pressure leads to a higher roughness and more erosion of the surface. However, the feedrate shows a reverse effect on the surface roughness and erosion. The surface microstructures also show the mechanism of material removal process involving initial and evolved damages. The subsurface hardness shows that treating the surface with a higher number of passes and pressure produces a higher increase of hardness and also a deeper hardening layer. But, a reverse effect on the subsurface hardness was found for the feedrate. Furthermore, cross-sectional microstructures show a higher density of slip bands in the deformed grains of the specimen treated with a higher number of jet passes and pressure. However, the amount of slip bands in the deformed grains is lower with increasing feedrate.

65 citations


Cited by
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TL;DR: In this paper, the structure and properties of bearing steels prior to the point of service are first assessed and described in the context of steelmaking, manufacturing and engineering requirements, followed by a thorough critique of the damage mechanisms that operate during service and in accelerated tests.

729 citations

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TL;DR: In this article, the development, fabrication, microstructures, and properties of MGMCs, including the room-temperature, cryogenictemperature and hightemperature mechanical properties upon quasi-static and dynamic loadings are reviewed.
Abstract: The mechanical properties of ex-situ and in-situ metallic glass matrix composites (MGMCs) have proven to be both scientifically unique and of potentially important for practical applications. However, the underlying deformation mechanisms remain to be studied. In this article, we review the development, fabrication, microstructures, and properties of MGMCs, including the room-temperature, cryogenic-temperature, and high-temperature mechanical properties upon quasi-static and dynamic loadings. In parallel, the deformation mechanisms are experimentally and theoretically explored. Moreover, the fatigue, corrosion, and wear behaviors of MGMCs are discussed. Finally, the potential applications and important unresolved issues are identified and discussed.

409 citations

Journal ArticleDOI
Chang Ye1, Sergey Suslov1, Bong-Joong Kim1, Eric A. Stach1, Gary J. Cheng1 
TL;DR: In this article, the authors investigated the mechanism of fatigue performance improvement in AISI 4140 steel by WLSP and found that microstructures formed after WlSP lead to a higher stability of dislocation structures and residual stress, which are beneficial for fatigue performance.

216 citations

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TL;DR: In this paper, the authors review some of the unique mechanical characteristics of BMGs along with some strategies that may be used to improve or exploit their characteristics so that Bulk metallic glasses can be used as structural materials in engineering applications.
Abstract: Bulk metallic glasses (BMGs) can exhibit excellent combinations of strength and fracture toughness that cannot be achieved by traditional metals, making them attractive for load bearing, mechanical engineering applications. Furthermore, recent research on BMGs has shown that many early perceived shortcomings, such as apparent brittleness or poor fatigue resistance, are not as big of a problem as once thought. The purpose of this paper is to review some of the unique mechanical characteristics of BMGs along with some of the strategies that may be used to improve or exploit their characteristics so that BMGs may be used as structural materials in engineering applications.

203 citations

Journal ArticleDOI
TL;DR: In this article, a facile method for preparing anatase and rutile bi-phase TiO 2 nanofibers was developed to enhance photocatalytic H 2 -production activity via water splitting.

202 citations