Fatigue Crack Paths in Cast Inconel 713LC with/without Al Diffusion Coating under Various Loading and Temperature Conditions

Fatigue Crack Paths in Cast Inconel 713LC with/without Al Diffusion Coating under Various Loading and Temperature Conditions

conference paper

cs

Fatigue crack paths in cast Inconel 713LC with and without Al diffusion coating were studied under various loading and temperature conditions. Both coatedand uncoated specimens were fatigued under symmetric bending, symmetric torsion and in-phase bending-torsion loading at room temperature and under a fully reversed push-pull straining at 800 C. Optical and scanning electron microscopy was used to study fracture surfaces and polished sections cut parallel to the specimen axis. The image analysis software was employed to determine the percentage of carbides on both the fracture surfaces and etched specimen sections. Unlike in the case of torsionloading, an accelerated crack nucleation took place at the particle/matrix interface within the diffusion coating in the case of both bending loading and push-pull straining. On the other hand, the final fracture of all tested specimens followed carbides located at grain boundaries and in inter-dendritic areas.

Fatigue crack paths in cast Inconel 713LC with and without Al diffusion coating were studied under various loading and temperature conditions. Both coatedand uncoated specimens were fatigued under symmetric bending, symmetric torsion and in-phase bending-torsion loading at room temperature and under a fully reversed push-pull straining at 800 C. Optical and scanning electron microscopy was used to study fracture surfaces and polished sections cut parallel to the specimen axis. The image analysis software was employed to determine the percentage of carbides on both the fracture surfaces and etched specimen sections. Unlike in the case of torsionloading, an accelerated crack nucleation took place at the particle/matrix interface within the diffusion coating in the case of both bending loading and push-pull straining. On the other hand, the final fracture of all tested specimens followed carbides located at grain boundaries and in inter-dendritic areas.

Fatigue crack paths in cast Inconel 713LC with and without Al diffusion coating were studied under various loading and temperature conditions. Both coatedand uncoated specimens were fatigued under symmetric bending, symmetric torsion and in-phase bending-torsion loading at room temperature and under a fully reversed push-pull straining at 800 C. Optical and scanning electron microscopy was used to study fracture surfaces and polished sections cut parallel to the specimen axis. The image analysis software was employed to determine the percentage of carbides on both the fracture surfaces and etched specimen sections. Unlike in the case of torsionloading, an accelerated crack nucleation took place at the particle/matrix interface within the diffusion coating in the case of both bending loading and push-pull straining. On the other hand, the final fracture of all tested specimens followed carbides located at grain boundaries and in inter-dendritic areas.

Fatigue, bending, torsion, Inconel 713LC, diffusion coating

Fatigue, bending, torsion, Inconel 713LC, diffusion coating

2012

16.08.2012

9788895940441

Proceedings of the 4th International Conference on Crack Paths

967–975

9