The surface layer of a turbine blade consists of a succession of layers: recrystallized + fine-grained; and work hardened characterized by an increased hardness and lattice spacing of the solid solution; and an undeformed one. The content of alloy elements in the surface layer differs considerably from the mean composition of the alloy.
The adverse effect of surface work-hardening on heat resistance is associated with the large gradient of lattice parameters at high temperature and with consequent internal stresses.
Cracking during extended operation at high temperature is caused by a depletion of the surface layer in alloy elements which, under normal conditions, ensure the high heat resistance of the alloy.
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Kolomytsev, P.T., Samgin, A.A. & Snetkov, A.Y. Structure and composition of the surface layer of gas turbine blades. Met Sci Heat Treat 2, 473–476 (1960). https://doi.org/10.1007/BF00649722
- Adverse Effect
- Solid Solution
- Surface Layer
- Normal Condition
- Internal Stress