Adapted diffusion processes for effective forging dies

verfasst von: H. Paschke, A. Nienhaus, K. Brunotte, T. Petersen, M. Siegmund, L. Lippold, M. Weber, M. Mejauschek, P. Landgraf, G. Braeuer, B. A. Behrens, T. Lampke
Abstract: Hot forging is an effective production method producing safety relevant parts with excellent mechanical properties. The economic efficiency directly depends on the occurring wear of the tools, which limits service lifetime. Several approaches of the presenting research group aim at minimizing the wear caused by interacting mechanical and thermal loads by using enhanced nitriding technology. Thus, by modifying the surface zone layer it is possible to create a resistance against thermal softening provoking plastic deformation and pronounced abrasive wear. As a disadvantage, intensely nitrided surfaces may possibly include the risk of increased crack sensitivity and therefore feature the chipping of material at the treated surface. Recent projects (evaluated in several industrial applications) show the high technological potential of adapted treatments: A first approach evaluated localized treatments by preventing areas from nitrogen diffusion with applied pastes or other coverages. Now, further ideas are to use this principle to structure the surface with differently designed patterns generating smaller ductile zones beneath nitrided ones. The selection of suitable designs is subject to certain geo-metrical requirements though. The intention of this approach is to prevent the formation and propagation of cracks under thermal shock conditions. Analytical characterization methods for crack sensitivity of surface zone layers and an accurate system of testing rigs for thermal shock conditions verified the treatment concepts. Additionally, serial forging tests using adapted testing geometries and finally, tests in the industrial production field were performed. Besides stabilizing the service lifetime and decreasing specific wear mechanisms caused by thermal influences, the crack behavior was influenced positively. This leads to a higher efficiency of the industrial production process and enables higher output in forging campaigns of industrial partners.
Organisationseinheit(en): Institut für Umformtechnik und Umformmaschinen
Externe Organisation(en): Fraunhofer-Institut für Schicht- und Oberflächentechnik (IST)
Technische Universität Chemnitz
Typ: Aufsatz in Konferenzband
Publikationsdatum: 03.05.2018
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Allgemeine Physik und Astronomie
Elektronische Version(en): https://doi.org/10.1063/1.5034870 (Zugang: Geschlossen)
: Details im Forschungsportal „Research@Leibniz University“

BibTeX

@inproceedings{9076c54c037e4736a1aecc29c21c4875,
title = "Adapted diffusion processes for effective forging dies",
abstract = "Hot forging is an effective production method producing safety relevant parts with excellent mechanical properties. The economic efficiency directly depends on the occurring wear of the tools, which limits service lifetime. Several approaches of the presenting research group aim at minimizing the wear caused by interacting mechanical and thermal loads by using enhanced nitriding technology. Thus, by modifying the surface zone layer it is possible to create a resistance against thermal softening provoking plastic deformation and pronounced abrasive wear. As a disadvantage, intensely nitrided surfaces may possibly include the risk of increased crack sensitivity and therefore feature the chipping of material at the treated surface. Recent projects (evaluated in several industrial applications) show the high technological potential of adapted treatments: A first approach evaluated localized treatments by preventing areas from nitrogen diffusion with applied pastes or other coverages. Now, further ideas are to use this principle to structure the surface with differently designed patterns generating smaller ductile zones beneath nitrided ones. The selection of suitable designs is subject to certain geo-metrical requirements though. The intention of this approach is to prevent the formation and propagation of cracks under thermal shock conditions. Analytical characterization methods for crack sensitivity of surface zone layers and an accurate system of testing rigs for thermal shock conditions verified the treatment concepts. Additionally, serial forging tests using adapted testing geometries and finally, tests in the industrial production field were performed. Besides stabilizing the service lifetime and decreasing specific wear mechanisms caused by thermal influences, the crack behavior was influenced positively. This leads to a higher efficiency of the industrial production process and enables higher output in forging campaigns of industrial partners.",
author = "H. Paschke and A. Nienhaus and K. Brunotte and T. Petersen and M. Siegmund and L. Lippold and M. Weber and M. Mejauschek and P. Landgraf and G. Braeuer and Behrens, {B. A.} and T. Lampke",
note = "Funding information: The presented investigations are results of the completed and current industrial research projects: “Prognosetool f. Plasmanitrierproz. z. Randschichtbehandlung v. Werkzeugen und Bauteilen” (18741 N), “Anwendung v. Plasma-borierverfahren z. Steigerung der therm. Belastbarkeit v. Schmiedegesenken” (19553 N), “Steigerung d. Lebensdauer nitrierter Schmiedegesenke durch Realisierung duktiler Oberflaechenbereiche z. Verbesserung d. Rissbestaendigkeit” (19529 N), “Angepasste Randschichtmod. z. Reduzierung des thermoschockbedingten Verschlei{\ss}es bei Schmiedege-senken” (19302 N) embedded into the program “Industrielle Gemeinschaftsfoerderung (IGF)” funded by the Federal Ministry of Economics and Technology (BMWi) via the AiF and “Untersuchungen z. Einsatzverh. erodierter und nitrierter Schmiedewerkzeuge” (BE 1691/23-3) funded by German Research Foundation (DFG). The authors thank the German Research Foundation and the Federal Ministery of Economics and Technology for the financial support.; 21st International ESAFORM Conference on Material Forming, ESAFORM 2018 ; Conference date: 23-04-2018 Through 25-04-2018",
year = "2018",
month = may,
day = "3",
doi = "10.1063/1.5034870",
language = "English",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
editor = "Gianluca Buffa and Livan Fratini and Giuseppe Ingarao and {Di Lorenzo}, Rosa",
booktitle = "Proceedings of the 21st International ESAFORM Conference on Material Forming, ESAFORM 2018",
}