Energy efficient manufacturing chain for advanced bainitic steels based on thermo-mechanical processing
de Castro, P.J.(1), Dong, J.(1), Rocha, A.S.(2), Fechte-Heinen, R. (1,3), Epp, J.(1,3)
(1)Leibniz Institute for Materials Engineering-IWT, Badgasteiner Str. 3, 28359 Bremen, Germany.
(2)Metal Forming Laboratory – LdTM, Av. Bento Gonçalves 9500, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
(3)MAPEX Centre for Materials and Processes, University of Bremen, Bibliothekstraße 1, 28359 Bremen, Germany.
Keywords: thermo-mechanical treatment; synchrotron diffraction; bainitic steels; continuous cooling; carbide-free bainite
The development of new strategies in the manufacturing chain of mechanical components is one promising way to achieve energy efficiency in the production of machine and automotive components. The development of advanced high strength steels by exploration of metallurgical processes is one of the key objectives in this regard. On this occasion, continuous-cooling-bainitic-forging-steels offer an extraordinary path for accomplishing this goal, since they allow achieving their final microstructure directly after hot forging followed by controlled cooling, simultaneously attaining suitable mechanical properties. Considerable reduction of energy consumption is achievable thanks to the suppression of conventionally used energy-intensive additional heat treatments. In the present project, different concepts for a manufacturing chain with thermo-mechanical processing and subsequent surface engineering have been thoroughly investigated by means of advanced in-situ methods such as the High Energy X-Ray diffraction and the use of Eddy-Current Sensor. Furthermore, Finite Element Method Simulation was employed to identify suitable processing windows regarding the parameters of the thermo-mechanical treatment. The knowledge delivered by these experimental and numerical investigations was then transferred to on-site industrial and laboratorial forgings to achieve tailored properties of treated parts. Different surface treatments based on plasma nitriding, deep rolling and induction hardening were then employed to further improve the surface-near properties for application of highly loaded components. In the present contribution, an overview about the overall project and of the main results will be presented and discussed.
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