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  • 1.
    Binbin, Song
    et al.
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Peizhonga, Feng
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Jianzhong, Feng
    State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-ferrous Metal Research, Xi’an.
    Yuan, Ge
    State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-ferrous Metal Research, Xi’an.
    Guangzhi, Wu
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Xiaohong, Wang
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Akhtar, Farid
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Oxidation properties of self-propagating high temperature synthesized niobium disilicide2014In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 85, p. 311-317Article in journal (Refereed)
    Abstract [en]

    NbSi2 monoliths were prepared by self-propagating high temperature synthesis (SHS) and hot pressing (HP) and their oxidation behavior was investigated at various temperatures (823 K to 1123 K) in air. The combustion mode of SHS reaction was steady state combustion, and the combustion product was single-phase NbSi2. Oxidation studies show that the highest mass gain was 0.95675 kg m-2 at 1023 K. In cyclic oxidation, the oxidation rate was reduced and the mass gain was only 0.15507 kg m-2. A dense protective amorphous SiO2 scale formed at 823 K and 923 K whereas a porous multilayer SiO2 and α/β-Nb2O5 oxide scales formed at and above 1023 K and spalled off. Pest oxidation of NbSi2 monoliths was not observed in hot pressed NbSi2 monoliths

  • 2.
    Gaddam, Raghuveer
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Pederson, Robert
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Hörnqvist, Magnus
    GKN Aerospace Engine Systems.
    Antti, Marta-Lena
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Fatigue crack growth behaviour of forged Ti-6Al-4V in gaseous hydrogen2014In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 78, p. 378-383Article in journal (Refereed)
    Abstract [en]

    Fatigue crack growth (FCG) tests were performed to evaluate the fatigue behaviour of forged Ti-6Al-4V in air and high-pressure gaseous hydrogen (15 MPa) at room temperature. The results indicate that the effect of gaseous hydrogen is dependent on the stress intensity factor (ΔK). The FCG rate was unaffected by hydrogen below a critical stress intensity, ΔK* ≈ 20 MPa√m. Above ΔK*, the FCG rate fluctuated and subsequently accelerated at higher ΔK values. The observed behaviour is attributed to the change in the fracture processes. A hypothesis is proposed that describes the FCG behaviour in gaseous hydrogen.

  • 3.
    Sistonen, E.
    et al.
    Helsinki University of Technology, Faculty of Engineering and Architecture, Department of Structural Engineering and Building Technology.
    Cwirzen, A.
    Helsinki University of Technology, Faculty of Engineering and Architecture, Department of Structural Engineering and Building Technology.
    Puttonen, J.
    Helsinki University of Technology, Faculty of Engineering and Architecture, Department of Structural Engineering and Building Technology.
    Corrosion mechanism of hot-dip galvanised reinforcement bar in cracked concrete2008In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 50, no 12, p. 3416-3428Article in journal (Refereed)
    Abstract [en]

    In this paper, probable corrosion mechanisms of hot-dip galvanised reinforcement bar in cracked concrete based on long-term durability tests and other studies are determined. The fist mechanism consists of a local dissolution of eta (η) and zeta (ζ) phase. In the second mechanism due to non-uniform zinc coating local dissolution of eta (η) and zeta (ζ) phase together with longitudinal and perpendicular cracking in zinc layer may lead to separation of zinc layer. In the third mechanism due to non-uniform zinc coating full dissolution of eta (η) and partial dissolution of zeta (ζ) phase together with longitudinal and perpendicular cracking in ferrite may lead to separation of zinc layer and ferrite. Corrosion rate with used cement type was decreasing. That is not dependent on concrete quality. However, concrete type has an effect on corrosion rate and moisture conditions. © 2008 Elsevier Ltd. All rights reserved.

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