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- W2805828564 abstract "During machining, the machined surface is modified due to the thermal, mechanical and chemical loads applied by the used process. Temperature, temperature gradients, strain and strain gradients lead to a change of the microstructure in the surface zone. Internal material loads are difficult to access by experimental measuring methods during processing. Therefore, this work aims at solving the inverse problem by determining the resulting internal thermal loads during grind hardening based on the characterized surface modifications. During grind hardening, high thermal loads are applied to the workpiece. This leads to a phase transformation in the surface zone. Different electron microscopic investigations like EBSD and EPMA are used to determine the austenite grain size, the resulting grain size, phases and the dissolution and diffusion of carbon and chromium. Based on that, conclusions can be drawn about the heating rate, period of heating time, cooling rate and the achieved maximum temperature. In this work, the steel 42CrMo4 (AISI 4140) was used with a ferrite-pearlite and a quenched and tempered matrix. It was found out, that the microstructure varies depending on the penetration depth and the changing temperature field. Analytically calculated temperature profiles were compared to temperature profiles which were estimated by material modifications in different penetration depths. The acquired data also give a deep insight into the mechanisms of phase transformation for short time heat treatments and the influence of inhomogeneous matrix material on the modified surface zone." @default.
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- W2805828564 date "2018-01-01" @default.
- W2805828564 modified "2023-10-17" @default.
- W2805828564 title "Grind hardening: Correlations between surface modifications and applied internal loads" @default.
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- W2805828564 doi "https://doi.org/10.1016/j.procir.2018.05.038" @default.
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