Thermomechanical Treatment Influence on the High-speed Steel Hardness and Wear

Abstract

Thermomechanical treatment consists in using two classic manufacturing methods. This type of treatment was applied to studied high-speed steel (HS2-9-1-8). The tests performed aimed to establish the influence on the hardness and wear of the high-temperature thermomechanical treatment (HTTMT) applied to studied steel. The application of an additional plastic deformation (the deformation degree between 45-75%) positively influences the hardness and wear value. Being a HTTMT, the plastic deformation was followed by quenching, the utilized agent being the oil or compressed air. When the quenching agent was the oil the hardness increased by 6-7% and the wear diminished up to 40%. Samples thermally treated in the classical way were used as comparison elements. The study performed shows that a favourable evolution of the analysed properties appears when the deformation degree is between 55 and 75%. The air compressed quenching sets for the analysed characteristics, the same evolution with those obtained during the oil quenching. The increased hardness for the studied high-speed steel utilized at cutting tools manufacturing will generate a slower wear of the cutting edge that means important economies in cutting process.

Research on Heat Treatment Applied to High Strength Construction Steels

“…Obtaining these materials is done by adding alloying elements within the limits of weldable steel classes, by heat treatment [3,4] if the technical conditions are ensured, by controlled lamination or by other methods.…”