Sage Journals: Discover world-class research

Abstract

In this article, the influence of a M-CrAlY polycrystalline coating on the thermal fatigue behavior of a nickel-base superalloy has been investigated. A special device using a rotating bending machine and two thermal sources has been used to perform thermomechanical tests. The two thermal sources have been set to obtain temperature variations between 750 and 1120 C in the central part of the specimens, with a frequency of 0.1 Hz. The results show a deleterious effect of the coating on the fatigue resistance. Numerical simulations have been carried out on SAMCEF to determine the thermomechanical field of the so-tested specimens. Calculated thermomechanical cycles of critical sites are associated with micro-structure evolution and damage by cracking observed on the specimens. Damage mechanisms related to the presence of the coating are discussed.

Keywords

thermomechanical fatigue coating Ni-base superalloy

Get full access to this article

View all access options for this article.

References

Boudot, A. (1999). Properties of High Temperature Protective Coating Used for HP Turbine Blades, PhD Thesis in Materials Science, University Paul Sabatier, Toulouse, France (in French).

Engler-Pinto, C. C. and Rezaí-Aria, F. (2000). Thermo-mechanical Fatigue Investigation of Single Crystal Nickel Base Superalloy SRR99, In: Sehitoglu, H. and Maier, H. J. (eds), Thermomechanical Fatigue Behaviour of Materials: Third Volume, ASTM STP 1371, pp. 319-332, American Society for Testing and Materials, West Conshohocken, PA .

Kowalewski, R. and Mughrabi, H. (2000). Thermo-mechanical and Isothermal Fatigue of a Coated Columnar-grained Directionally Solidified Nickel-based Superalloy, In: Sehitoglu, H. and Maier, H. J. (eds), Thermomechanical Fatigue Behaviour of Materials: Third Volume, ASTM STP 1371, pp. 3-17, American Society for Testing and Materials, West Conshohocken, PA .

Lautridou, J. C. , Guedou, J. Y. and Delautre, J. (1996). Comparison of Single Crystal Superalloys for Turbine Blade through TMF Tests , In: Bressers, J. and Remy, L. (eds), Fatigue Under Thermal and Mechanical Loading, Mechanisms, Mechanics and Modelling, Proceedings of the Symposium held at Petten, The Netherlands, Kluwer Academic Publishers, Dordrecht, The Netherlands, 22-24 May 1995, pp. 141-149 .

Merval, A. (2002). Thermomechanical Fatigue Modelling of Coated Superalloy Samples, Research Master in Mechanical Engineering, University Paul Sabatier, Toulouse, France (in French).

Paun, F. (1998). New Type of Experimental Method in Thermo-mechanical Fatigue of Materials with a High Cycling Frequency, PhD Thesis in Mechanical Engineering, University Paul Sabatier, Toulouse, France (in French).

Paun, F. and Chieragatti, R. (2000). A New Technique for High Frequency Multiaxial Thermomechanical Fatigue Testing of Materials, In: Sehitoglu, H. and Maier, H. J. (eds), Thermomechanical Fatigue Behaviour of Materials: Third Volume, ASTM STP 1371, pp. 150-164, American Society for Testing and Materials, West Conshohocken, PA .

Remy, L. , Chataigner, E. and Fleury, E. (1996). Modelling of the Thermal-mechanical Fatigue Behaviour of Coated and Bare Nickel-base Superalloy Single Crystal AM1 , In: Bressers, J. and Remy, L. (eds), Fatigue Under Thermal and Mechanical Loading, Mechanisms, Mechanics and Modelling, Proceedings of the Symposium held at Petten, The Netherlands, Kluwer Academic Publishers, Dordrecht, The Netherlands, 22-24 May 1995, pp. 381-392 .

Remy, L. , Koster, A. , Chataigner, E. and Bickard, A. (2000). Thermal-mechanical Fatigue and the Modelling of Materials Behaviour Under Thermal Transients, In: Sehitoglu, H. and Maier, H. J. (eds), Thermomechanical Fatigue Behaviour of Materials: Third Volume, ASTM STP 1371, pp. 223-238, American Society for Testing and Materials, West Conshohocken, PA .

10.

Zamrik, S. Y. and Renauld, M. L. (2000). Thermo-mechanical Out-of-phase Fatigue Life of Overlay Coated IN-738LC Gas Turbine Material, In: Sehitoglu, H. and Maier, H. J. (eds), Thermomechanical Fatigue Behaviour of Materials: Third Volume, ASTM STP 1371, pp. 119-137, American Society for Testing and Materials, West Conshohocken, PA .

Influence of Coating on the Thermal Fatigue Resistance of a Ni-based Superalloy

Abstract

Keywords

Get full access to this article

References