Abstract
Examining the creep behavior of materials locally provides important information about material performance. In this study, IN625 powder was layered on GTD-111 superalloy by the laser cladding (LC) method. After LC, the creep behavior of the clad zone (CZ), substrate, and heat affected zone (HAZ) was investigated by the small punch creep test (SPCT) method. The results showed that the CZ has the highest creep life. This was attributed to the widespread presence of equiaxed grains, high volume fraction and fineness of the γ′ phase as well as NbC carbide particles. The HAZ region, on the other hand, had the shortest creep life due to the dissolution of γ′ particles during LC. γ′ phase in the substrate and γ″ phase in CZ, the most important obstacles to dislocations movement during creep were identified, among which γ″ particles were superior to γ′ particles in the substrate due to their high volume fraction and fineness. The results of micro-hardness also confirmed this.
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