Recrystallization behavior after annealing and thermal shock tests of W-K- TiC alloy

摘要

W-K-TiC alloys with different titanium carbide concentration (0.05, 0.1, 0.25, 1) wt.% were fabricated through spark plasma sintering (SPS) method. Single shot thermal shock tests with a length of 5 ms and 100 shots thermal shock tests with a length of 1 ms were carried out. The microstructure and Vickers micro-hardness of each sample were investigated. It is revealed that the surface of the samples began to recrystallize after thermal shock tests, and the samples with 5 ms for single shot had more serious recrystallization than the samples with 1 ms for 100 shots because of its higher surface temperature after thermal shock tests. The samples were annealed at 1400 degrees C, 1600 degrees C, 1800 degrees C, respectively. It is shown that the addition of TiC particles could slow down re crystallization of W-K-TiC alloy, and its recrystallization temperature can reach to between 1400 degrees C and 1600 degrees C.