|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
||Effect of Cr addition on the microstructure and mechanical properties of additively manufactured GRCop-84
||Ajay Bhagavatam, Husam Alrehaili, Guru Dinda, Golam Newaz
|On-Site Speaker (Planned)
GRCop-84 (Cu-8Cr-4Nb) offers potential for high-heat-flux applications and is designed specifically for rocket engine main combustion chamber liners. In this research, the effect of Cr addition to GRCop-84 alloy is investigated to assess the composition-structure-property relationship. Near 100% dense samples were successfully deposited using laser metal deposition (LMD) with successive addition of Cr (0.5, 1.0, 1.5, 5, and 10 wt.%) to the GRCop-84. Microstructural investigation revealed the presence of Cr2Nb intermetallic, egg-shaped Cr particles, and Cu-Cr fiber-like eutectic phases with primary Cu matrix. Interestingly, the eutectic phase was primarily observed along the Cu cell boundaries. The length of the eutectic fibers grew from 0.3 to 1.7 μm, and the resulting hardness increased from 143 to 171 HV with the addition of Cr from 0.5 to 10 wt.%, respectively. These promising preliminary results show improvement in mechanical properties of GRCop-84 alloy with the addition of Cr and better overall performance.
||Additive Manufacturing, Copper / Nickel / Cobalt, Mechanical Properties