Research Article

Characterization of Tool Wear in High-Speed Milling of Hardened Powder Metallurgical Steels

Table 2

Work piece materials.

Powder metallurgical steels
 TermCold work steel HS 4-2-4 PMHigh-speed steel 6-5-3 PM
 Hardness (HRC)6664
 BinderC Cr Mo V WC Si Mn Cr Mo V W
 Modulus of elasticity 𝐸 (GPa)223230
 Density 𝜌 (kg/dm3)7.798.0
 Thermal conductivity 𝑘 (W/mk)19.624.0
 Thermal expansion coefficient 𝛼 (10−6/K) (at 100/200/300/600°C)10.6/11.1/11.6/12.611.5/11.7/12.2/13.0
 Specific heat capacity 𝑐 (W/mK)450420