The aim of this research work was to determine the effect of vacuum heat treatment conditions on different properties and their correlations for low Si content AISI H11 type hot work tool steel using single CNPTB test specimen. Work was also focused on the potential of CNPTB test specimen for designing advanced tempering diagrams and optimizing vacuum heat treatment of hot work tool steels. Results show that CNPTB specimens allow simultaneous determination and correlation of multiple properties of hot work tool steels, with compression and bending strength increasing with hardness, and strain hardening exponent and bending strain with fracture toughness. On the other hand, the best machinability and surface quality of hardened hot work tool steel are obtained for hardness values between 46 and 50 HRC and fracture toughness below 60 MPa√m.
展开▼
