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  • 1.
    Komenda, Jacek
    et al.
    RISE, Swerea, KIMAB.
    Martin, David
    RISE, Swerea, KIMAB.
    Lönnqvist, Johan
    RISE, Swerea, KIMAB.
    The effect of boron addition on precipitation and hot ductility of 1.5Mn-0.1Nb-Ti carbon steels in As-cast condition2016In: Materials Science Forum, 2016, Vol. 879, p. 990-995Conference paper (Refereed)
    Abstract [en]

    Twelve experimental steels with a base composition 1.5wt% Mn, 0.01 wt% V and 0.1 wt% Nb and varying C (0.05, 010 and 0.20 wt%), Ti (20 - 260 ppm) and B (0 - 100 ppm) contents have been systematically examined to quantify the effects of composition on precipitation behavio-ur and hot ductility during simulated continuous casting conditions. Nb-rich precipitates were present in the alloys with 0.10 wt-% C and 0.20 wt-% C. Alloys with 0.05, 010 and 0.20wt% C contained 50 - 100 nm size Ti-Nb carbonitrides. Boron was bound in 20 - 100 nm size boronitrides located in prior austenite grain boundaries. A Gleeble 3800 was used to study hot ductility and strain induced precipitation processes in the alloys. Alloys without B and Ti additions exhibited poor hot ductility at 850°C and 950°C, whereas the 0.05 wt-% C and 0.10 wt-% C alloys showed improved hot ductility (reduction in area 40-50%) by the addition of either >50 ppm B or 250 ppm Ti. The 0.2 wt-% C alloys showed no improvement from B or Ti additions. Examination of fracture surfaces of hot ductility specimens showed that boronitrides were located at prior austenite grain boundaries in alloys containing 80 - 100 ppm of B. Compression-relaxation tests showed that alloying with boron caused a noticeable decrease of the start temperature of straininduced precipitation in the alloys.

  • 2.
    Stormvinter, Albin
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF, Tillverkningsprocesser.
    Kristoffersen, Hans
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Troell, Eva
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Senaneuch, Jérôme
    RISE, Swerea, KIMAB.
    Haglund, Sven
    RISE, Swerea, KIMAB.
    Impact of internal oxidation and quenching path on fatigue of powertrain components2015In: Heat Treating 2015: Proceedings of the 28th ASM Heat Treating Society Conference, 2015, p. 498-503Conference paper (Refereed)
    Abstract [en]

    Atmospheric case hardening of powertrain components may cause internal oxidation and thus reduce hardenability at the surface zone. This may affect the fatigue strength, which restricts the maximum cyclic load on steel components and hence is a major impediment for powertrain development and design. Here we have investigated the effect of furnace gas atmosphere composition and quenching path on fatigue properties of powertrain components. The results show that the detrimental effect of internal oxidation on fatigue may be compensated for by altering of the furnace atmosphere. Moreover, it is shown that the quenching path below the martensite start temperature also has an impact on the fatigue properties. These experiments were done in a full-scale industrial furnace on steel bars in l6MnCr5 and 2ONiMo9-7F. 

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