20th International Forgemasters Meeting - IFM 2017

The application of ultra high strength steels and advanced high strength steels at automobile industry is currently increasing for weight reduction and crash safety. The growing use of HSS results in decreasing tool life and productivity in manufacturing. The aim of this study is a development of high performance tool steel in hot work. Both the durability and high thermal conductivity are important factor for the performance. For the alloy design, the single and combined effects of alloy element of C, B, Si, Ni, V, Mo at mechanical properties were delicately studied and thermodynamic calculation and simulation with commericial databases of steel products were applied. For determining optimum heat treatment condition, continuous cooling transition diagrams are tested and the microstructure and precipitations are observed by transmission electron microscopy depending on heat treatment condition. The developed material has optimum combination of strength and toughness that shows extended life at simulated work enviornment in laboratory scale and much higher thermal conductivity compare with tranditionally used too steel.