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Reisgen U.,Welding Engineering and Defects | Reisgen U.,Aachen University | Reisgen U.,RWTH Aachen | Steiners M.,RWTH Aachen | Kucharczyk P.,Institute of Ferrous Metallurgy
Welding and Cutting | Year: 2011

The joining of material combinations consisting of steel and aluminium in a reliable process was accomplished only in the recent times as a result of the development of digital arc processes. Within the framework of the excellence cluster Integrative production technology for high-wage countries, the investigations of the applicability of the digitally regulated cold metal transfer (CMT) process (designed by Fronius Schweißtechnik) to the joining of steel-aluminium hybrid structures were performed at the Welding and Joining Institute, Aachen. The behaviour of these hybrid structures under cyclic loading was tested at the Institute for Ferrous Metallurgy, Aachen. The test specimens used were flat tensile test specimens, which had the weld in the centre and were subjected to force-controlled, sinusoidal loads (R value: 0.1). The established stress-strain lines were analysed with reference to the recommendations of IIW - International Institute of Welding. Source


Glisic D.,University of Belgrade | Radovic N.,University of Belgrade | Koprivica A.,Institute of Ferrous Metallurgy | Fadel A.,University of Belgrade | Djordje Drobnjak,University of Belgrade
ISIJ International | Year: 2010

The influence of vanadium and nitrogen on microstructure and mechanical properties of medium-carbon steels has been studied by means of metallography and mechanical testing. Vanadium addition to the low nitrogen steel suppresses the formation of ferrite-pearlite following the low reheating temperatures and microstructure consists of bainitic sheaves. Increasing nitrogen at the same vanadium level promotes the acicular ferrite formation. For high reheating temperatures, dominantly acicular ferrite structure in both the low nitrogen and the high nitrogen vanadium steels is obtained. The results suggest that vanadium in solid solution promotes the formation of bainite. The effect of nitrogen is related to the precipitation of VN particles in austenite with high potency for intragranular nucleation of acicular ferrite and to the precipitation of V(C, N) particles in ferrite with high potency for precipitation strengthening. Addition of both vanadium and nitrogen considerably increases the strength level, while CVN20 impact energy increases on changing the microstructure from bainitic ferrite to the fine ferrite-pearlite and acicular ferrite. © 2010 ISIJ. Source


Radovic N.,University of Belgrade | Koprivica A.,Institute of Ferrous Metallurgy | Glisic D.,University of Belgrade | Fadel A.,University of Belgrade | Drobnjak D.,University of Belgrade
Materials Science Forum | Year: 2010

The influence of vanadium and nitrogen on microstructure and mechanical properties of medium-carbon steels has been studied by means of metallography and mechanical testing. Vanadium addition to the low nitrogen steel suppresses the formation of ferrite-pearlite following the low reheating temperatures and microstructure consists of bainitic sheaves. Increasing nitrogen at the same vanadium level promotes the acicular ferrite formation. For high reheating temperatures, dominantly acicular ferrite structure in both the low nitrogen and the high nitrogen vanadium steels is obtained. The results suggest that vanadium in solid solution promotes the formation of bainite, whereas the effect of nitrogen is related to the precipitation of VN particles in austenite with high potency for intragranular nucleation of acicular ferrite and to the precipitation of V(C,N) particles in ferrite with high potency for precipitation strengthening. Addition of both vanadium and nitrogen considerably increases the strength level, while CVN20 impact energy increases on changing the microstructure from bainitic ferrite to the fine ferrite-pearlite and acicular ferrite. © (2010) Trans Tech Publications. Source


Bajic N.,Research and Development Center | Sijacki-Zeravcic V.,University of Zagreb | Kovacevic K.,Institute of Ferrous Metallurgy
Materials Science | Year: 2010

We describe the changes in the proportions of some microconstituents in the structure of the weld metal and the heat-affected zone and analyze the mechanical and technological properties of the welded joints of high-strength microalloyed Nb/Ti steel made by the E-process and MAG-process of welding with modification of the composition of the filler and welding parameters. The influence of different structures of the filler material and welding parameters on the microstructures of the HAZ and weld metal is studied with an aim to explain the changes in the mechanical and technological properties of the welded joints of microalloyed Nb/Ti steel. © 2010 Springer Science+Business Media, Inc. Source


Bolshakov V.I.,Institute of Ferrous Metallurgy | Semenov Y.S.,Institute of Ferrous Metallurgy | Ivancha N.G.,Institute of Ferrous Metallurgy | Vishnyakov V.I.,Institute of Ferrous Metallurgy | And 5 more authors.
Metallurgical and Mining Industry | Year: 2012

The main results of investigations carried out before blowing blast furnace No 3 at PJSC "Yenakiieve Iron and Steel Works" equipped with modern bell-less charging device are shown ©Metallurgical and Mining Industry. Source

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