Abstract
The laser metal deposition (LMD) additive manufacturing process was applied to produce TiC/Inconel 625 composite parts. The high-temperature oxidation performance of the LMD-processed parts and the underlying physical/chemical mechanisms were systematically studied. The incorporation of the TiC reinforcement in the Inconel 625 improved the oxidation resistance of the LMD-processed parts, and the improvement function became more significant with increasing the TiC addition from 2.5 wt. % to 5.0 wt. %. The mass gain after 100 h oxidation at 800 °C decreased from 1.4130 mg/cm2 for the LMD-processed Inconel 625 to 0.3233 mg/cm2 for the LMD-processed Inconel 625/5.0 wt. % TiC composites. The oxidized surface of the LMD-processed Inconel 625 parts was mainly consisted of Cr2O3. For the LMD-processed TiC/Inconel 625 composites, the oxidized surface was composed of Cr2O3 and TiO2. The incorporation of the TiC reinforcing particles favored the inherent grain refinement in the LMD-processed composites and, therefore, the composite parts possessed the sound surface integrity after oxidation compared with the Inconel 625 parts under the same oxidation conditions. The LMD-processed TiC/Inconel 625 composites exhibited the excellent oxidation resistance under the oxidation temperature of 800 °C. A further increase in the oxidation temperature to 1000 °C caused the severe oxidation attack on the composites, due to the unfavorable further oxidation of Cr2O3 to CrO3 at the elevated treatment temperatures.
Highlights
INTRODUCTIONInconel 625 is a solid-solution or/and precipitation strengthened nickel-based superalloy, exhibiting the good combination of the superior mechanical properties and the
Inconel 625 is a solid-solution or/and precipitation strengthened nickel-based superalloy, exhibiting the good combination of the superior mechanical properties and the1938-1387/2015/27(S1)/S17005/11/$28.00 S17005-1VC 2014 Laser Institute of America S17005-2J
The mass gain after 100 h oxidation at 800 C decreased from 1.4130 mg/cm2 for the laser metal deposition (LMD)-processed Inconel 625 to 0.3233 mg/cm2 for the LMD-processed Inconel 625/5.0 wt. % titanium carbide (TiC) composites
Summary
Inconel 625 is a solid-solution or/and precipitation strengthened nickel-based superalloy, exhibiting the good combination of the superior mechanical properties and the. The incorporation of the hard and temperature resistant ceramic particles within the Inconel matrix to produce metal matrix composites (MMCs) is regarded as a promising method to improve the mechanical performance of Inconel alloys.. A review of the existing literature reveals that the carbide (e.g., TiC, WC, and CrC) reinforcement in Inconel alloys has been studied mainly for hardness and wear resistance Besides these properties of Inconel alloys, the high-temperature oxidation resistance becomes more and more important, since the development of the more reliable Inconel components applied in the higher temperatures is in increasing demand in the modern industries. To the best of authors’ knowledge, there are still no comprehensive previous studies focusing on the inherent relationship of the oxidation performance, constitution phases, and microstructures of laser processed Inconel based MMCs reinforced by carbide particles.
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