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Open AccessArticle

Improving the Inner Surface State of Thick-Walled Tubes by Heat Treatments with Internal Quenching Considering a Simulation Based Optimization

Institute for Applied Materials (IAM-WK), Karlsruhe Insitute of Technology (KIT), Engelbert-Arnold-Str. 4, 76131 Karlsruhe, Germany
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Processes 2020, 8(10), 1303; https://doi.org/10.3390/pr8101303
Received: 15 September 2020 / Revised: 2 October 2020 / Accepted: 5 October 2020 / Published: 16 October 2020
(This article belongs to the Section Materials Processes)
Internal Quenching is an innovative heat treatment method for difficult to access component sections. Especially, the microstructure, as well as the residual stress state at inner surfaces, of thick-walled tubes can be adjusted with the presented flexible heat treatment process. Based on multiphysical FE-models of two different steels, a simulative optimization study, considering different internal quenching strategies, was performed in order to find the optimal cooling conditions. The focus hereby was on the adjustment of a martensitic inner surface with high compressive residual stresses. The simulatively determined optimal cooling strategies were carried out experimentally and analyzed. A good agreement of the resulting hardness and residual stresses was achieved, validating the presented Fe-model of the Internal Quenching process. The shown results also indicate that the arising inner surface state is very sensitive to the transformation behavior of the used steel. Furthermore, the presented study shows that a preliminary simulative consideration of the heat treatment process helps to evaluate significant effects, reducing the experimental effort and time. View Full-Text
Keywords: Internal Quenching; heat treatment simulation; finite element; residual stress; phase transformation; steel treatment; heat treatment modeling Internal Quenching; heat treatment simulation; finite element; residual stress; phase transformation; steel treatment; heat treatment modeling
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MDPI and ACS Style

Mühl, F.; Klug, M.; Dietrich, S.; Schulze, V. Improving the Inner Surface State of Thick-Walled Tubes by Heat Treatments with Internal Quenching Considering a Simulation Based Optimization. Processes 2020, 8, 1303.

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