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Sökning: swepub > Högskolan Dalarna > Olsson Mikael > Övrigt vetenskapligt/konstnärligt

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21.
  • Nilsson, Maria, et al. (författare)
  • On the possibility to replace cemented carbide with CVD and PVD coated steel in wire drawing dies – A tribological investigation
  • 2009
  • Ingår i: Wear of Materials. - Las Vegas.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Cemented carbide is today the most frequently used drawing die material in steel wire drawing applications. This is mainly due to the possibility to obtain a broad combination of hardness and toughness thus meeting the requirements concerning strength, crack resistance and wear resistance set by the wire drawing process. However, the increasing cost of cemented carbide in combination with the possibility to increase the wear resistance of steel through the deposition of wear resistant CVD and PVD coatings have increased the interest for steel wire drawing dies during the last years. In the present study, the possibility to replace cemented carbide wire drawing dies with CVD and PVD coated steel drawing dies have been investigated by i) tribological testing, i.e. pin-on-disc and scratch testing, in combination with post-test observations of the tribo surfaces using scanning electron microscopy, energy dispersive X-ray spectroscopy and 3D surface profilometry and ii) steel wire drawing under full scale industrial conditions. In the tests a sodium stearate based soap was used as a lubricant. Of the CVD and PVD coatings evaluated in the tribological tests, a CVD TiC and a PVD CrC/C coating displayed the most promising results, i.e. a combination of high wear resistance and low friction in contact with the steel wire material and consequently these coatings were selected for the steel wire drawing tests. Post-test examination of the worn drawing dies showed that the CrC/C coating displayed a high wear rate while the TiC coating showed a low wear rate but also signs of local cracking and chipping. However, the overall best performance was displayed by a TiC – CrC/C dual layer coating which displayed a limited cracking and chipping tendency although the top CrC/C coating showed a high wear rate. Based on the results obtained, CVD and PVD coatings aimed to provide improved tribological performance of steel wire drawing dies should display a smooth surface topography, a high wear resistance, a high fracture toughness (i.e. a high cracking and chipping resistance) and intrinsic low friction properties in contact with the wire material. Also, the steel substrate used must display a sufficient load carrying capacity and resistance to thermal softening.
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23.
  • Olsson, Mikael (författare)
  • Characterization of hot-rolled and annealed oxides on 2507 stainless steel – Microstructure, chemical composition, mechanical properties and pickling characteristics
  • 2021
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • The surface characteristics of samples of the 2507 super duplex stainless steel with three different surface conditions, i.e. after hot rolling, annealing and blasting plus pickling, respectively, have been investigated. High resolution scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and scratch testing have been used to characterize the oxide scales with respect microstructure, chemical composition, and mechanical properties.SEM and EDS-analysis of the oxide scales formed on hot rolled and hot rolled plus annealed samples, show an outer Fe-rich oxide layer and an inner Cr-rich oxide layer close to the interface. While the hot rolled oxide scale displays a relatively porous oxide composed of oxide particles, the hot rolled plus annealed oxide scale displays a more dense, “sintered”, microstructure, i.e. the high temperature during the annealing step promotes a densification of the oxide scale microstructure.The outer porous Fe-rich layer shows poor cohesive strength and poor adhesion to the underlying Cr-rich layer. In contrast, the inner more dense Cr-rich layer shows strong adhesion towards the 2507 duplex stainless steel. The dense microstructure and strong adhesion of the inner Cr-rich layer is believed to significantly influence the blasting and pickling characteristics.
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24.
  • Olsson, Mikael (författare)
  • Characterization of oxide layers formed on pilot plant Steckel rolled 304 stainless steel samples
  • 2021
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • The evolution of oxide scales on 304 austentic stainless steel during Steckel mill rolling has been investigated by performing pilot trials at Swerim Luleå. The influence of Steckel furnace conditions, i.e. temperature, time and excess oxygen, at reheating between subsequent roll passes have been evaluated and the resulting surface structures have been characterized.High resolution scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to characterize the oxide scales with respect microstructure and chemical composition. Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to analyze the chemical composition at the stainless steel / oxide interface region.In common for all Steckell rolled samples investigated was a pronounced rough surface morphology and the surface roughness was found to increase with more iterations of rolling. Also, the amount of oxides in the rolled surface tends to increase with longer heating times and more iterations of rolling. Surface areas, less distorted by the rolling contact, displayed an oxide scale with an outer rather well-defined oxide layer with relatively large grains and an inner, less well defined, oxide layer. EDS-analysis show that the outer oxide mainly consists of Fe2O3, whereas the inner oxide layer corresponds to a chromium rich (Cr,Fe)2O3 oxide combined with areas of partly oxidized stainless steel. ToF-SIMS analysis of the stainless steel / oxide interface region show the presence of B, Ca and Cu in connection to the oxides.
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26.
  • Olsson, Mikael (författare)
  • Influence of annealing on hot-rolled oxides on 2507 stainless steel
  • 2021
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • The influence of annealing on the oxide scale characteristics of hot rolled samples of 2507 super duplex stainless steel have been investigated using well controlled lab scale annealing experiments. High resolution scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to characterize the oxide scales with respect microstructure and chemical composition.SEM and EDS-analysis of the oxide scales after annealing show an outer Fe-rich oxide layer and an inner Cr-rich oxide layer close to the interface. While the hot rolled oxide scale displays a relatively porous oxide composed of oxide particles, the hot rolled plus annealed oxide scale displays a more dense, “sintered”, microstructure.The annealing peak temperature was found to have a strong impact on the oxide scale microstructure. The higher peak temperature, 1150 °C, resulted in a significantly denser microstructure with more pronounce, larger grains, as compared with the lower peak temperature, 1100 °C, which resulted in a less dense microstructure. In contrast, the influence of annealing atmosphere, was found to be relatively small.
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