Heat conductivity of high-speed cutting steels

The influence of heat treatment and resulting microstructures on the thermophysical properties of martensitic steels

“…In particular, Terada et al [21] measured a reducing influence of the element chromium on the thermal conductivity of ferritic iron. This effect was also reported by Geller et al [30] for high-speed steels with different chromium contents. In the context of the results shown here ( Fig.…”

“…Investigations by Geller et al [30] on high-speed steel led to the conclusion that the chemical composition of the martensitic matrix dominates thermal conductivity. Indeed, precipitation of carbides creates new scatter sources that are supposed to lower k, but this effect is overcompensated by depletion of alloying elements in the martensitic matrix.…”

The influence of steel microstructure in high-speed high-load bearing applications

“…That is because, otherwise, this steel appears to exhibit microstructural aspects usually associated with good resistance to adhesive wear such as carbide fraction and interparticle spacing. Its thermal conductivity has not been measured in this work, nevertheless, its content of alloying elements suggests lower thermal conductivity [9-11]. For example, Terada et al measured the thermal conductivity of the Fe-rich solid-solution of ferritic iron of various Fe-X binary alloy systems at 300 K [11].…”

“…Yet, for a given particle size, the higher the number density of the second phases, the smaller is the interparticle spacing, which would be expected to enhance the resistance to adhesive wear. This does not seem to be always sufficient, however, as has been observed testing the ASP®2062 steel microstructure since such expected benefit would be negated by a predicted lower thermal conductivity in view of both, the steel content of alloying elements [9-11] and its microstructure featuring relatively high amount of carbides.…”

“…Heat treatment will result in a tailored amount of retained austenite in the microstructure; a relatively poor thermal conductor [8]. Furthermore, the steel content of alloying elements and their partitioning between matrix and precipitates will affect thermal conductivity [9][10][11].…”