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.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Number of pages||6|
|Publication status||Published - 2022|
|Event||42nd Risø International Symposium on Materials Science - Risø, Denmark|
Duration: 5 Sep 2022 → 9 Sep 2022
|Conference||42nd Risø International Symposium on Materials Science|
|Period||05/09/2022 → 09/09/2022|