A Co–Cr–Ni–W–C Alloy Processed by Multiple Rolling

A Co–Cr–Ni–W–C alloy was manufactured and cold-rolled to investigate the effect of the latter. Its microstructure, precipitates, and mechanical properties are presented. An M6C carbide, Co3W intermetallic compound and α-Co matrix were selected as the main phase constituents. During cold rolling, the alloy was deformed mainly by dislocation slipping at a small reduction, but some microtwins were formed in the matrix. When the reduction increased up to 20%, grains were elongated, and twinning became the main deformation route. When the reduction reached 40%, the alloy exhibited a typical microstructure with greatly elongated grains. The intersection of twinning lamellae lead to many cell-like substructures. The appropriate reduction of the alloy was of 15–20%, while the critical reduction made up 30%. If deformation exceeds the critical rolling reduction, cracks would originate in the alloy. With an increase in the rolling reduction, the alloy ductility decreases but the strength grows.