تاثیر پوشش های محافظ بر خواص مکانیکی سوپر آلیاژها Superalloys

The Effect of Protective Coatings on

the Mechanical Properties of Superalloys

تاثیر پوشش های محافظ بر خواص مکانیکی سوپر آلیاژها

ABSTRACT

COATINGS PROTECT the surface of tur- bine blades from damage caused by high-tem- perature corrosion and thus preserve the struc- tural shape of blades and their mechanical properties for the required time. There are many papers in the technical liter- ature that deal with experimental studies of heat resistance, fatigue strength, and thermal fatigue of coated superalloys. However, the connection between the physical and mechanical properties of protective coatings and their effect on the me- chanical properties of turbine-blade superalloys has not been studied sufficiently well. For thin diffusion coatings, this can be explained by the complexity of the task, both in reproducing the correct composition and in testing the coatings separately from the alloy. However, for these coatings, information on their physical and me- chanical properties is necessary for their proper application and for accurate calculations of coated-blades service lives.