About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Surface Engineering V
|
Presentation Title |
Oxidation of Ferrous Alloys and Coatings Under Isothermal, Impulse Heating, and Diesel Engine Operation |
Author(s) |
John Saputo, Felipe Caliari, Sanjay Sampath |
On-Site Speaker (Planned) |
Sanjay Sampath |
Abstract Scope |
Next generation oxidation barrier coatings based on nickel and iron-based alloys were evaluated for diesel engine applications. Rapid oxidation at temperatures above 500°C limits the use of the 4140 steels used to manufacture pistons crowns. To evaluate the performance of those coatings, a novel transient combustion-based laboratory test and direct high temperature engine exposure were used. NiCrAlY and FeCrAlY coatings protect the substrate from oxidation at isothermal temperatures up to 677°C. On direct exposure to cyclic combustion test, the NiCrAlY coatings appear to be resistant to degradation at very high temperatures, while the FeCrAlY coatings degrade more rapidly. Engine tests further validate the efficacy of NiCrAlY coatings. From this work NiCrAlY coatings are estimated to have a potential upper limit of 677°C, at which interdiffusion between the coating and substrate will likely complicate their use. |
Proceedings Inclusion? |
Planned: |
Keywords |
Surface Modification and Coatings, High-Temperature Materials, Environmental Effects |