TiC 분산된 니켈기 합금의 미세조직 및 기계적 특성에 미치는 열처리 영향
Effect of Heat Treatment on the Microstuctures and Mechanical Properties of TiC Dispersed Ni-base Alloy
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Abstract
The microstructures and properties of TiC dispersed nickel-base alloy were studied in this work. The alloy prepared by powder metallurgical processing was solution treated, 1st-aged at 880℃ for 16 hours, and then 2nd-aged at 760℃ for 4 hours. Microstructure of sintered specimen showed that TiC particles are uniformly dispersed in Ni base alloy. In the specimen aged at 880℃ for 8 hours, the fine γ' Ni3(Al,Ti) precipitates with round shape are observed and the very fine γ' Ni3(Al,Ti) particles with round shape are precipitated in the specimen aged at 760℃ for 4 hours. The presence of γ' precipitates in TiC/Ni base alloy increased the hardness and wear resistance of the specimen. The hardness and wear resistance of the Ni-base with TiC are higher than those of conventional Ni-base superalloy X-750 because of dispersion strengthening of TiC particles. The hardness, transverse rupture strength and wear resistance of the specimen 2nd-aged at 760℃ for 4 hours are higher than those of 1st-aged specimen due to ultrafine γ' Ni3(Al,Ti) precipitates.