NTF,Dept. of Geot.,Mini. and Enviro.,Dept. of Mat. Sci. and Metal.,Lj. (NTFGRM)
13.
Some aspects of sub-zero tempering at vacuum heat-treatment of HSS
Leskovšek, Vojteh ; Liščić, Božidar ; Ule, Boris
The microstructure of AISI M2 high-speed steel can be substantially modified by a vacuum heat-treatment combined with a deep cryogenic treatment in order to optimize the ratio between hardness and ...fracture toughness. This ratio is significantly affected by the volume fractions of retained austenite and undissolved eutectic carbides, as well as by the mean distance between these carbides. Calculated fracture toughness values, which were obtained using a newly developed semi-empirical equation, based on the stress-modified critical strain criterion and the quantified microstructural parameters, proved that for given vacuum heat-treatment conditions the volume fraction of retained austenite and the hardness have a significant effect on the fracture toughness K$_{Ic}$ of the high-speed steel. The analysis of vacuum heat-treated modified "Navy C" ring specimens confirmed that the dimensional changes could be controlled. The main factors that influence the dimensional changes are the volume fraction of retained austenite and the steel's hardness.
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