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Design and development of a new high nitrogen bearing steel, for offshore wind turbine with improved surface fatigue, wear and corrosion properties for in service life increment (SteelWind)
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Design and development of a new high nitrogen bearing steel, for offshore wind turbine with improved surface fatigue, wear and corrosion properties for in service life increment (SteelWind)

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The aim of this project was to increase the reliability of wind turbine, improving the properties of steel bearings by the development of a new high nitrogen austenitic steel (HNAS) functional grade replacing the 100Cr6 steel which is usually used for steel bearings production. The work finally focused on the selection of a Carnit 90 alloy with a composition expected to withstand both dynamic loads – achieving high levels of strength - and corrosion attack of water, especially sea water when used in offshore applications. With respect to the initially experimentally tested composition, some modifications have been made in the industrial prototype production, especially in the balance of C and N, and in the content of added elements as Mo, in order to guarantee a fully austenitic microstructure, free from undesired precipitates when properly subjected to solubilizing treatment. With the developed Carnit composition, it has been possible to produce bars (from ingot casting, PESR and forging) characterized by a good quality, in terms of absence of porosity and steel cleanliness. Besides that, the required level of strength for the bulk (300 HV, 900- 1000 MPa) can be achieved after a proper solubilization heat treatment, with an excellent level of toughness in comparison with the reference materials. The operations of surface strengthening needed to enhance the surface hardness, as deep rolling in particular, were investigated and optimized on a laboratory scale. However, the surface hardness levels achieved on the components are still unsatisfying, which resulted in early failures of the prototypes in the full-scale tests. Component testing included full-scale testing and the development of functional testing equipment aimed at creating in the conventional steel the typical features of bearing damage as butterfly defects, which are often found coupled to WEC damage.
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ISSN 1831-9424
ISBN 978-92-76-25390-7
DOI 10.2777/1334
Katalooginumber KI-NA-30-458-EN-N
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ISSN 1831-9424 ISBN 978-92-76-25390-7 DOI 10.2777/1334 Katalooginumber KI-NA-30-458-EN-N
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