golden to burnt blue
during the span of tool life.
It is revealed that the rise of cutting temperature is higher for multilayer ZrCN coated carbide insert compared to TiN coated carbide insert and wears the tool faster. The color of the chips have also become golden, lighter, i.e. metallic from blue due to reduction in cutting temperature using multilayer TiN coated carbide insert. Due to such reduction of cutting temperature, the tool life of multilayer TiN coated carbide insert is observed to be higher (19 min) in hard turning at higher parametric range and performs better.