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  • 1.
    Akhtar, Farid
    Department of Metallurgical and Materials Engineering, University of Engineering and Technology, Lahore.
    Effect of additive Cu-10Sn alloy on sintering Behavior of elemental powders in composition of 465 stainless steel2007In: Journal of Iron and Steel Research International, ISSN 1006-706X, E-ISSN 2210-3988, Vol. 14, no 4, p. 61-74Article in journal (Refereed)
    Abstract [en]

    The addition of Cu-10Sn alloy for developing the high strength 465 maraging stainless steel from elemental powders was studied. The sintering parameters investigated include the sintering temperature, the sintering time, and the mass percent of Cu-10Sn. For vacuum sintering, effective sintering occurs at temperature between 1250°C and 1300°C. The maximum sintered density was achieved at 1300°C for 60 min with 3% (in mass percent) Cu-10Sn alloy. More than 3% (in mass percent) Cu-10Sn content and temperature above 1300°C caused slumping of the samples. A maximum density of 7.4 g/cm3 was achieved with 3% (in mass percent) Cu-10Sn content at a sintering temperature of 1300°C for 60 min. A maximum ultimate tensile strength (UTS) of 517 MPa was achieved with 3% (in mass percent) Cu-10Sn content. With content higher than 2% (in mass percent) Cu-10Sn, a maximum increase in the density was observed. The fracture morphologies of the sintered samples are also reported.

  • 2.
    Vuorinen, Esa
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Pino, David
    Luleå tekniska universitet.
    Lundmark, Jonas
    Prakash, Braham
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Wear characteristics of surface hardened ausferritic Si-steel2007In: Journal of Iron and Steel Research International, ISSN 1006-706X, E-ISSN 2210-3988, Vol. 14, no 1, supp 1, p. 245-248Article in journal (Refereed)
    Abstract [en]

    High strength steels can be produced by austempering of Si-containing steels. It is possible to achieve high toughness and good wear resistance in these steels. Surface hardening of this group of steels can further increase the surface hardness and wear resistance and in combination with high strength in the bulk, also the fatigue strength. Surface hardening by laser-hardening has been performed on steel 55Si7 after austempering of the steel in order to create a ferritic-austenitic carbide free microstructure. Tempering effects and hardness values have been studied. Optical as well as scanning electron microscopy has been used together with x-ray diffractometry in the characterization of the micro-structural changes. Wear resistance testing of austempered and laser hardened samples respectively of the Si-alloyed steel have been reported and also compared with that of the conventional Cr-alloyed steel. The results of the specific phase transformation from austenite to martensite during wear process will be reported

  • 3.
    Xu, An.Jun
    et al.
    University of Science and Technology Beijing, School of Materials Science and Engineering.
    Yang, Qixing
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Gustafsson, Börje
    Uddeholms AB, System Control & Raw Materials.
    Wang, Feng
    University of Science and Technology Beijing, School of Materials Science and Engineering.
    Li, Jian-li
    University of Science and Technology Beijing, School of Materials Science and Engineering.
    Björkman, Bo
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Recycling of EAF dust by smelting in the electric arc furnace and its influences on the EAF operation and dust generation2010In: Journal of Iron and Steel Research International, ISSN 1006-706X, E-ISSN 2210-3988, Vol. 17, no Suppl. 2, p. 132-141Article in journal (Refereed)
    Abstract [en]

    The 2(nd) campaign for recycling electric arc furnace dust (EAFD) has been carried out at Uddeholms AB (early as Uddeholm Tooling AB). Studies examining the effects of EAFD smelting on parameters related to EAF products, energy consumption and EAFD generation have been performed jointly by Uddeholms AB and MiMeR, Minerals and Metals Recycling Research Center, at Lulea University of Technology. 114 tonnes of EAFD were smelted in 121 EAF heats during the campaign. Dust samples were taken isokinetically from the exhaust gas system during the charger processing. Data of Zn contents in the dust samples were combined with other results to examine the influence of EAF operating conditions and EAFD recycling on Zn evaporation. Via EAFD recycling, Zn content in dust increased from 21.5% to 29.7% and the quantity of dust decreased by more than 40%. There were hardly any negative impact noted during the campaign on the furnace energy consumption and properties of steel and slag tapped from the EAF, while the recycled EAFD was amounted to around 2% of the steel weight

  • 4.
    Yang, Qixing
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
    Xu, An-Jun
    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing.
    Xue, Peng
    School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing , Department of Ferrous Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing.
    He, Dog-feng
    Department of Ferrous Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing.
    Li, Jian-Li
    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan , Department of Ferrous Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing.
    Björkman, Bo
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
    Briquette Smelting in Electric Arc Furnace to Recycle Wastes from Stainless Steel Production2015In: Journal of Iron and Steel Research International, ISSN 1006-706X, E-ISSN 2210-3988, Vol. 22, no Suppl. 1, p. 10-16Article in journal (Refereed)
    Abstract [en]

    Wastes from stainless steel production were briquetted together with carbon for smelt-reduction in the electric arc furnace, EAF, to achieve an internal recycling. A laboratory induction furnace was used to simulate the EAF. With a close simulation of the smelting, disintegration of the briquettes heated under load and recovery of metals from briquettes melted together with stainless steel and slag former were investigated. The influences of test conditions on carbon reduction of oxides in the briquettes were also examined. The briquettes endured heating at 1 186 °C under load of 3.5 kg and could be charged to the melt in small quantity without causing serious splashing. For a high metal recovery, it was necessary to charge the briquettes together with slag former. Small local zones of smelt-reduction with high carbon concentration could thus be formed during the charger heating. Silicon content in the metal near to the briquettes should be minimised to achieve a high degree of carbon reduction. Based on results obtained from this study, suggestions were made on smooth operations of smelt-reduction of the briquettes by using EAF or induction furnace with large scales.

  • 5.
    Zhang, Hui-ning
    et al.
    School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou.
    Li, Jian-li
    Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan.
    Xu, An-jun
    Metallurgical and Ecological Engineering School, University of Science and Technology, Beijing.
    Yang, Qixing
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
    He, Dong-feng
    Metallurgical and Ecological Engineering School, University of Science and Technology, Beijing.
    Tian, Nai-yuan
    Metallurgical and Ecological Engineering School, University of Science and Technology, Beijing.
    Carbothermic Reduction of Zinc and Iron Oxides in Electric Arc Furnace Dust2014In: Journal of Iron and Steel Research International, ISSN 1006-706X, E-ISSN 2210-3988, Vol. 21, no 4, p. 427-432Article in journal (Refereed)
    Abstract [en]

    The reduction of zinc and iron oxides from electric arc furnace dust (EAFD) by carbon was investigated at temperatures between 800 and 1300 °C. The analytic technique employed includes chemical analysis, X-ray fluorescence spectroscopy (XRF), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) equipped with X-ray energy dispersive spectrometry (EDS), and thermodynamic database FactSage 6. 2. It was found that the reduction of zinc and iron oxides depends largely on Boudouad reaction. At 900 °C, zinc exists in tested samples as ZnO, which is reduced in the temperature range of 1000 — 1100 °C. At 1100 °C, 99. 11% of the zinc is evaporated. The metallization ratio of Fe is 79. 19% at 1300 °C, as the content of Fe2+ is still 9. 40%. A higher temperature is thus required for a higher reduction degree of Fe oxides by solid or gaseous carbon

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