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  • 1.
    Gudmundson, Peter
    et al.
    Tre konsulter AB.
    Wüthrich, C.
    Brown Boveri Forschungszentrum.
    Die Werkstoffdämpfung von Stählen bei hohen Dehnungsamplituden1986Inngår i: Materialwissenschaft und Werkstofftechnik, ISSN 0933-5137, E-ISSN 1521-4052, Vol. 17, nr 8, s. 286-292Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [de]

    Am Beispiel von zwei martensitischen Chromstählen (X 22 CrMoV 12 1, X 20 Cr 13) und eines kaltverformten Austeniten (X 12 CrNiWTi 16 13) wird die amplitudenabhängige Werkstoffdämpfung bei Raumtemperatur untersucht. Die martensitischen Werkstoffe weisen infolge der magneto-elastischen Effekte eine hohe amplitudenabhängige Dämpfung auf. Es kann gezeigt werden, daß eine Erhöhung der Festigkeit durch Absenken der Anlaßtemperatur zu einer Abnahme der Werkstoffdämpfung führt. Der untersuchte austenitische Werkstoff besitzt nach Kaltverformung eine beträchtliche Dämpfung, die jedoch beim Tempern bereits bei Temperaturen oberhalb von 100 °C auf die bei Austeniten üblichen tiefen Werte absinkt. Dieser Effekt wird der Verankerung der Versetzungen beim Tempern zugeschrieben.

    Damping of Steels at High Strain Amplitudes

    The amplitude dependent damping has been investigated in two martensitic chromium steels (X 22 CrMoV 12 1, X 20 Cr 13) and a cold worked austenitic steel (X 12 CrNiWTi 16 13) at room temperature. Due to the magneto-elastic effects, the martensitic steels show a strong amplitude dependent damping. It cound be shown that the damping is reduced remarkably by a reduction of the annealing temperature. The austenitic material shows a very high damping in the cold worked condition. Tempering at relatively low temperatures (above 100 °C) reduces damping to the low values usually expected for austenitic materials. This effect was attributed to the pinning of dislocations during tempering.

  • 2.
    Kharitonov, D. S.
    et al.
    KTH, Skolan för kemivetenskap (CHE).
    Kurilo, I. I.
    Wrzesinska, A.
    Zharskii, I. M.
    Corrosion inhibition of AA6063 alloy by vanadates in alkaline media2017Inngår i: Materialwissenschaft und Werkstofftechnik, ISSN 0933-5137, E-ISSN 1521-4052, Vol. 48, nr 7, s. 646-660Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Vanadium aqueous compounds are considered as promising environmentally friendly inhibitors for heterogeneous aluminium alloys. In this study, mechanism of corrosion inhibition of AA6063 in alkaline media by vanadate inhibitors is presented. A combination of weight loss and open circuit potential measurements, potentiodynamic polarization and electrochemical impedance spectroscopy was used to compare corrosion behavior of AA6063 alloy in aerated pH 10 0.05 M sodium chloride solutions in the absence and presence of 0.003 mol/l sodium orthovanadate. Tetrahedrally coordinated mono- and polyvanadates, that are main forms in such solutions, cause a decrease in corrosion current density and significantly increase amplitude of impedance spectra and impedance modulus |Z| values due to mixed cathodic-anodic inhibition effect mainly associated with the formation of adherent surface film on cathodic and anodic intermetallic particles of alloy.

  • 3.
    Marquis, G. B.
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Lättkonstruktioner.
    Yildirim, H. C.
    Fatigue improvement of welded steel joints by high frequency mechanical impact treatment2015Inngår i: Materialwissenschaft und Werkstofftechnik, ISSN 0933-5137, E-ISSN 1521-4052, Vol. 46, nr 2, s. 136-144Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The International Institute of Welding (IIW) technical working units provide unique forums for knowledge exchange to experts and professionals from industry, research institutes and world-leading universities. Developing science-based and industrially-relevant best practice guidelines is a key objective of these units. In the past decade, high frequency mechanical impact (HFMI) has significantly developed as a reliable, effective and user-friendly method for post-weld fatigue strength improvement technique for welded steel structures. The development of a new guideline for the design of structures improved using high frequency mechanical impact is presented. The extra fatigue strength benefit for high frequency mechanical impact treated high strength steels is also presented. Important issues like high frequency mechanical impact equipment, proper treatment procedures, operator safety, training, quality control measures and documentation are briefly discussed. Aspects of this guideline and the unique international nature of the IIW which has made it possible are described.

  • 4.
    Olofsson, Anders
    et al.
    KTH, Skolan för industriell teknik och management (ITM).
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Hardening Distortions of Serial Produced Crown Wheels2017Inngår i: Materialwissenschaft und Werkstofftechnik, ISSN 0933-5137, E-ISSN 1521-4052Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    The hardening distortions of serial produced crown wheels are studied with respect to gear runout, inner diameter and back-face tilt. The data analysed originates from a production data base from ordinary production as well as from directed experiments carried out in production, resulting in a large set of data. Strong influences are found for steel plants, position of material in ingots and stacking levels on hardening trays. It could be concluded that rectangular strands have a detrimental effect on gear runout, which, however, can be strongly decreased by disabling the magnetic stirring during casting. Furthermore, the inner diameter after quenching is influenced by the stacking level on the hardening tray when free-hardening or when using a segmented central expander during press quenching. This influence is attributed to variations in hardening temperature. When press quenching using a fixed mandrel, the effect of stacking level disappears. Moreover, it is found that the back-face tilt strongly depends on the position in the ingot as well as on the stacking level on the hardening tray.

  • 5. Samuelsson, Jack
    et al.
    Jonsson, B.
    Barsoum, Zuheir
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Lättkonstruktioner.
    Service fatigue design of complex welded construction equipment2008Inngår i: Materialwissenschaft und Werkstofftechnik, ISSN 0933-5137, E-ISSN 1521-4052, Vol. 39, nr 10, s. 734-739Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Many steel structures and components are fabricated from steel plates and steel castings. The dominating joining method is welding for all kinds of transport vehicles and this paper describes briefly main problems in connection with design and fabrication of fatigue loaded structures. Design and fabrication has developed during the last 30 years and today we have tools, methods and knowledge to produce more optimised structures. Some of the work has been performed as joint work within Nordic projects and within IIW (International Institute of Welding). FE-modelling, improved design rules, knowledge about influence from defects and residual stresses, new manufacturing methods and scientific based weld quality rules are briefly discussed in this paper.

  • 6.
    Stenberg, Thomas
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Lättkonstruktioner.
    Lindgren, Eric
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. HIAB AB, Research and Development Loader Cranes, Sweden.
    Barsoum, Zuheir
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Barmicho, Ilona
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Fatigue assessment of cut edges in high strength steel – Influence of surface quality2017Inngår i: Materialwissenschaft und Werkstofftechnik, ISSN 0933-5137, E-ISSN 1521-4052, Vol. 48, nr 6, s. 556-569Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The influence of surface roughness on the fatigue strength in high strength steels and different cutting processes are studied. Fatigue testing is conducted on S700 and S960 material for different plate thicknesses cut in dog bone specimens using oxygen, plasma, laser and waterjet cutting. The surface roughness is measured for all specimens and residual stress measurements are carried out. Estimations of the fatigue strength are made based on the measured surface roughness and the ISO 9013:2002 standard for thermal cutting quality tolerances. The testing shows a 15–70 % increase in the fatigue strength compared to the estimation, proving a weak connection between the surface quality levels in ISO 9013:2002 and the fatigue test results. Different codes and design recommendations (IIW, EC3 and EN 13001) for fatigue strength of cut surfaces are compared with the fatigue test results which clearly shows an increased fatigue strength with enhanced quality and steel grades. However, the codes and design recommendations do not allow for any fatigue strength improvement with improved quality and increased yield strength.

  • 7. Stiewe, C.
    et al.
    He, Z.
    Platzek, D.
    Karpinski, G.
    Mueller, E.
    Li, S.
    Toprak, Muhammet S.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Muhammed, Mamoun
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Control of thermoelectric properties in ZrO2/CoSb3 nano-dispersed composites2007Inngår i: Materialwissenschaft und Werkstofftechnik, ISSN 0933-5137, E-ISSN 1521-4052, Vol. 38, nr 9, s. 773-776Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Nano-dispersed ZrO2/CoSb3 composites of various composition were prepared by uniaxial hot pressing of nano-sized powders of thermoelectric CoSb3 intermixed with ceramic nano-powders. The phase purity, the niicrostructure, and the temperature dependent transport parameters of the composites were investigated. Non-dispersed samples from nano-sized CoSb3 powders show higher electrical conductivity compared to melt-grown material which is attributed to the presence of a small excess of metallic Sb, but they exhibit lower thermal conductivity due to the fine-grained structure. Addition of 5 at.-% ZrO2 enhances the ratio of electrical to thermal conductivity, whereas hardly affects the See-beck coefficient. In this manner the nano-dispersion method provides an effective approach to improving the materials thermoelectric performance.

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