Results in Optics (May 2022)
Development of a novel method for measuring the interfacial creep strength of laser cladding coatings
Abstract
In this study, the effect of IN713 coating applied by the laser cladding method on the creep behavior of GTD-111 superalloy by a small punch creep test was investigated. For this purpose, the creep behavior of the specimens in different parts in three conditions of casting, solution heat treatment, and aging was compared. The results showed that the specimen selected from the coating-substrate interface shows the highest creep resistance among other parts. This is attributed to the obstacle to the movement of dislocations by the coating-substrate interface from the substrate to coating. Also, in the aged specimens, due to the increase in γ′ phase volume fraction, the highest creep resistance was obtained. The heat-affected zone (HAZ) of the casting specimen had the lowest creep position due to the formation of partial liquation and cracking by γ-γ′ eutectic, M5B3 boride, Ni-Zr interface, and MC carbide. This problem was solved by performing solution heat treatment before coating and aging after coating.
