|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Exceptional Fatigue Performance of Si and V Alloyed Nitriding Steels
||Jonah Klemm-Toole, Michael Burnett, Kip Findley
|On-Site Speaker (Planned)
The useful life of many structural machine components is limited by fatigue. Thermochemical surface treatments such as nitriding improve fatigue performance by increasing surface hardness as well as inducing compressive residual stress. The increase of surface hardness and compressive residual stress is associated with the precipitation of fine nitride phases in the nitrided surface. In this work, we show that alloying a medium carbon steel with Si and V drastically improves the fatigue performance by the combination of increasing the surface properties (hardness and compressive residual stress) as well as increasing the base metal strength after nitriding. Quantitative transmission electron microscopy is used to relate Si and V content to the size and volume fraction of nitride precipitates to the property improvements. Opportunities for future alloy design strategies for nitriding steels are discussed.
||Characterization, Surface Modification and Coatings, Mechanical Properties