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Pedersen, Niels Leergaard
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Publications (4/4 displayed)
- 2022Heterogeneous microstructure and failure analysis of yaw gear rings
- 2022Heterogeneous microstructure and failure analysis of yaw gear rings
- 2015On Design of Anisotropy Distributions, Applying Lamina Formulas for 2d Result Visualization
- 2012Multibody Model for Planetary Gearbox of 500 kW Wind Turbine
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article
Heterogeneous microstructure and failure analysis of yaw gear rings
Abstract
The microstructure and hardness of two cracked and failed steel (42CrMo4) teeth from two different yaw rings have been investigated. It is shown that the surface quenching and tempering treatments introduce heterogeneous microstructures with a low-temperature tempered hard martensite surface layer and a high-temperature tempered matrix. This is common to both teeth, however, the gradient microstructure and hardness are different for these two yaw rings. It is suggested that this difference in gradient strongly affects cracking and failure. The failure mechanisms for the two teeth are discussed based on the microstructure and hardness analysis.