Metallographic study and wear resistance of a high-C wrought Co-based alloy Stellite 706K

The new CoCrMoC type wrought alloy Stellite 706K is an improved alloy over the CoCrWC type wrought alloy Stellite 6K in wear and corrosion resistance. The microstructure of Stellite 706K is characterized by CoCrMo solid solution matrix with banding and occasional twinning and various carbide phases. Pin-on-disc wear resistance of Stellite 706K at room temperature is evaluated. Solution treatment at temperatures from 1235 to 1250 °C on the mill annealed Stellite 706K decreases the bulk hardness and the hardness of CoCrMo matrix while increases the wear resistance. The excellent properties of Stellite 706K come from the combination of the high volume fraction of carbide particles and the tough CoCrMo matrix due to the alloying addition of Mo.