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Influence of pre-heating on the surface modification of powder-metallurgy processed cold-work tool steel during laser surface meltingŠturm, Roman, 1965- ; Štefániková, Mária ; Steiner Petrovič, DarjaIn this study we determine the optimal parameters for surface modification using the laser surface melting of powder-metallurgy processed, vanadium-rich, cold-work tool steel. A combination of steel ... pre-heating, laser surface melting and a subsequent heat treatment creates a hardened and morphologically modified surface of the selected high-alloy tool steel. The pre-heating of the steel prior to the laser surface melting ensures a crack- and pore-free modified surface. Using a pre-heating temperature of 350 °C, the extremely fine microstructure, which typically evolves during the laser-melting, became slightly coarser and the volume fraction of retained austenite was reduced. In the laser-melted layer the highest values of microhardness were achieved in the specimens where a subsequent heat treatment at 550 °C was applied. The performed thermodynamic calculations were able to provide a very valuable assessment of the liquidus temperature and, especially, a prediction of the chemical composition as well as the precipitation and dissolution sequence for the carbides.Source: Applied Surface Science. - ISSN 0169-4332 (Vol. 325, Jan. 2015, str. 203-210)Type of material - article, component partPublish date - 2015Language - englishCOBISS.SI-ID - 13845275
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Šturm, Roman, 1965- | 13026 |
Štefániková, Mária | ![]() |
Steiner Petrovič, Darja | 14647 |
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