- Effect of Heat Treatment on the Microstuctures and Mechanical Properties of TiC Dispersed Ni-base Alloy
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Seong-Hyeon Hong, Keum-Chul Hwang, Won-Hyuk Rhee, Eog-Yong Chin
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J Korean Powder Metall Inst. 2002;9(6):455-462.
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DOI: https://doi.org/10.4150/KPMI.2002.9.6.455
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 Abstract
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- 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°C for 16 hours, and then 2nd-aged at 760°C for 4 hours. Microstucture of sintered specimen showed that TiC particles are uniformly dispersed in Ni base alloy. In the specimen aged at 880°C for 8 hours, the fine gammaNi_3(Al,Ti) precipitates with round shape are observed and the very fine gammaNi_3(Al,Ti) particles with round shape are precipitated in the specimen aged at 760°C for 4 hours. The presence of gammaprecipitates 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 resistance of the specimen 2nd-aged at 760°C for 4 hours are higher than those of 1st-aged specimen due to ultrafine gammaNi_3(Al,Ti) precipitates.
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