Author
Detlef Löhe
Other affiliations: Karlsruhe University of Applied Sciences
Bio: Detlef Löhe is an academic researcher from Karlsruhe Institute of Technology. The author has contributed to research in topics: Residual stress & Creep. The author has an hindex of 18, co-authored 163 publications receiving 1400 citations. Previous affiliations of Detlef Löhe include Karlsruhe University of Applied Sciences.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, a finite element (FE) simulation model is presented in order to serve as a fast prediction tool for the surface layer characteristics after shot peening, including an elasto-viscoplastic combined isotropic kinematic material.
95 citations
05 Nov 2006-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the effect of inhomogeneous austenite formation due to locally different austenizing and quenching conditions is carried out to gain a better understanding of the material reaction during short-time hardening processes.
Abstract: Modelling of laser surface hardening of AISI 4140 steel including the effect of inhomogeneous austenite formation due to locally different austenizing and quenching conditions is carried out to gain a better understanding of the material reaction during short-time hardening processes. Dilatometric studies at high heating and cooling rates lead to base informations for material laws reflecting the influence of the inhomogeneity of austenite on the quenching process. They were implemented in the finite-element-program ABAQUS as user defined material laws and allow a coupled calculation of temperature and phase development during heating and cooling. The influence of heating rate and cooling rate on the time-dependent temperature fields and phase transformations within the affected zone was investigated. A good correspondence between the results of simulation and experimental data was obtained in respect of the resulting hardness profiles and the degree of homogeneity of the hardened structure.
79 citations
TL;DR: In this article, a detailed characterization of the microstructures created in quenched and tempered AISI 4140 (German grade 42CrMo4) steel following a temperature-dependent laser surface hardening treatment is presented.
69 citations
15 Nov 2007-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, out-of-phase thermal-mechanical fatigue (TMF) tests with superimposed higher frequency mechanical fatigue (HCF) loading were performed at three cast Al-Si cylinder head alloys.
Abstract: Out-of-phase thermal–mechanical fatigue (TMF) tests with superimposed higher frequency mechanical fatigue (HCF) loading were performed at three cast Al–Si cylinder head alloys All materials show for maximum temperatures of the TMF cycle between 200 and 250 °C a threshold of the amplitude of the superimposed HCF loading below of which the number of TMF cycles to failure is not significantly affected by the superimposed HCF loading Above this threshold the TMF life shows a strong decrease with increasing HCF loading Extensive microscopic analyses revealed that independent from the HCF loading first cracks are initiated at eutectic Si-particles detached from the surrounding α-Al matrix Crack propagation occurs at small HCF amplitudes along the eutectic regions At higher superimposed HCF loadings an accelerated crack propagation along slip bands within the α-Al matrix is observed
50 citations
TL;DR: In this paper, the statistics of Young's modulus of microspecimens subjected to a tensile load are examined experimentally, numerically and analytically, and the results imply that the apparent properties of cubic crystal aggregates can be determined using anisotropic effective medium approximations.
45 citations
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TL;DR: In this paper, the state of the art of electromagnetic forming is reviewed considering: • basic research work regarding the process principle, significant parameters on the acting loads, the resulting workpiece deformation, and their interactions, and the energy transfer during the process; • applicationoriented research work and applications in the field of forming, joining, cutting, and process combinations including electromagnetic forming incorporated into conventional forming technologies.
746 citations
TL;DR: In this article, the main drivers, developments and future requirements in the field of micromanufacturing as related to the machining process from the perspective of the recent research and development literature are reviewed.
738 citations
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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
TL;DR: In this article, the state-of-the-art in predictive performance models for machining operations is presented, and a critical assessment of the relevant modelling techniques and their applicability and/or limitations for the prediction of the complex machining operation performed in industry.
622 citations
TL;DR: In this paper, a modified constitutive law for elastic plastic phase changing materials is presented, based on the concept of transformation induced plasticity (TRIP) in steel, which is investigated both experimentally and theoretically.
485 citations