Investigating the correlation between nano-impact fracture resistance and hardness/modulus ratio from nanoindentation at 25–500 °C and the fracture resistance and lifetime of cutting tools with Ti1−xAlxN (x = 0.5 and 0.67) PVD coatings in milling operations

摘要: Abstract A novel laboratory technique, nano-impact testing, has been used to test Ti 1− x Al N (  = 0.5 and 0.67) PVD coated WC–Co inserts at 25–500 °C. Cutting tool life was studied under conditions of face milling the structural AISI 1040 steel; end hardened 4340 steel (HRC 40) TiAl6V4 alloy. correlation found between results rapid tests. When  = 0.67 improved resistance fracture during operations also in this coating compared when  = 0.50. The protects cutting surface against chipping that is typical for with intensive adhesive interaction workpiece materials such as machining Ti-based alloys. give encouragement elevated temperature can be predict wear hard coatings operations. At 500 °C nanoindentation shows there a lower H / E r ratio room temperature, consistent reduced observed test.