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      Processing of the Heat Resistant Bearing Steel M50NiL by Selective Laser Melting Translated title: Verarbeitung des warmfesten Lagerstahls M50NiL mittels selektiven Laserstrahlschmelzens aus dem Pulverbett

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          Additive manufacturing (AM) methods become more and more important due to improvements in the printing technology and availability of printers. As additive manufacturing is still a very expensive technology, it is predominantly used for complex parts in aerospace or medical applications. Especially in such demanding applications the properties of the parts are very important. In case of M50NiL, a carburizing heat resistant steel typically used for mainshaft bearings in aero engines, the development of an AM process and the properties of AM processed parts are shown. By comparison with specimens manufactured from conventional M50NiL it is demonstrated, that properties determined by optical microscopy, hardness testing, tensile testing, and rolling contact fatigue testing of M50NiL AM and M50NiL conventional manufactured are comparable.


          Verfahren des „Additive Manufacturing“ (AM) erlangen durch Verbesserung der Anlagentechnik und steigender Anlagenverfügbarkeit immer mehr an Bedeutung. Bedingt durch die derzeit noch hohen Kosten wird diese Herstellungsmethode bevorzugt für komplexe, konventionell kaum oder nur sehr aufwendig herstellbare Teile in Bereichen wie Luftfahrt oder Medizintechnik angewendet. Gerade in derartigen Anwendungen werden aber hohe Anforderungen an die Bauteileigenschaften gestellt. Am Beispiel des für Triebwerkslager häufig verwendeten warmfesten Einsatzstahls M50NiL werden die Entwicklung eines AM-Prozesses und die Eigenschaften derartig gefertigter Teile beschrieben. Ein Vergleich mit konventionell gefertigten Proben zeigt, dass die mittels Lichtmikroskopie, Härtemessung, Zugversuchen und Überrollversuchen ermittelten Eigenschaften von AM-gefertigten Proben aus M50NiL mit denen konventionell gefertigter Teile vergleichbar sind.

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          Most cited references 7

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          Hot Isostatic Pressing (HIP) technology and its applications to metals and ceramics

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            Comparison of Microstructural Changes and X-ray Diffraction Peak Width Decrease during Rolling Contact Fatigue in Martensitic Microstructures

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              Structural Changes Induced by Rolling Contact Fatigue – Results from Rig Testing and Field Experience

               O. Beer (corresponding) (2017)
              Rolling element bearings are highly stressed in the contact area. For the design of these bearings both the knowledge of the acting contact stress and material and application specific stress limits are important. Data about stress limits are typically derived from rig testing results. Besides a statistic evaluation of life tests also an X-ray diffraction analysis of tested bearing components is possible. An X-ray analysis enables the detection of structural changes during the overrolling process. This kind of analysis can also be performed on bearings after use in field. A comparison between evaluation results from rig testing and from field experience enables the possibility to check the transferability from rig testing to the use in field. Several fatigue-exposed bearing components coming from different kinds of testing, were evaluated by X-ray diffraction analysis. Also, components from aeroengine bearings after use in field are investigated. All these bearing parts are made from M50, a high-speed steel which is used in critical aeroengine bearing applications. By comparing results from rig testing with results from use in field, it can be demonstrated, that it is possible to transfer findings from rig testing to the use in field.

                Author and article information

                HTM Journal of Heat Treatment and Materials
                Carl Hanser Verlag
                16 August 2018
                : 73
                : 4
                : 187-201
                1 Präzisionskugeln Eltmann GmbH, Industriestr. 2, 97483 Eltmann
                2 Schaeffler Technologies, Herzogenaurach
                3 Lehrstuhl für Photonische Technologien, Erlangen
                Author notes
                4 OBeer@ (Corresponding author/Kontakt)
                © 2018, Carl Hanser Verlag, München
                Page count
                References: 11, Pages: 15
                Self URI (journal page):
                Scientific Contributions/Fachbeiträge


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