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RISS 인기검색어
- 검색키워드
- 저자 : Leposava Sidjanin (검색결과 2 건)
- 무료
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- 유료
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Modification of Cellulose and Rutile Welding Electrode Coating by Infiltrated TiO2 Nanoparticles
Sebastian Balos,Leposava Sidjanin,Miroslav Dramicanin,Danka Labus,Branka Pilic,Mirjana Jovicic 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.3
In this paper, a novel method of infiltration of TiO2 nanoparticles into the coating of the cellulose and rutile shielded metal arc welding electrode is shown. Tensile properties and strength of weld metals were correlated to the chemical composition of the weld metals, ferrite type, and non-metallic inclusion type, size and composition. As infiltration time is increased in the cellulose electrodes, the non-metallic inclusion count increases and their size decreases. They act as inoculants and lead to the replacement of Widmanstaetten with the finegrained acicular ferrite which increases the mechanical properties of the welds. The modification of rutile electrodes with low and medium infiltration time also refines the microstructure and increases the mechanical properties. Specimens welded with rutile electrodes infiltrated at maximum duration exhibited the lowest mechanical properties due to the relatively large non-metallic inclusions that act as void nucleation sites and the appearance of large grain allotriomorphic ferrite in the weld metal.
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Austempering Kinetics of Cu-Ni Alloyed Austempered Ductile Iron
Olivera Eric Cekic,Leposava Sidjanin,Dragan Rajnovic,Sebastian Balos 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.6
The aim of the paper was to investigate the effect of austempering parameters (time and temperature) on themicrostructure and mechanical properties of ADI alloyed with 1.5% Cu and 1.6% Ni (in wt.%) in order toestablish the optimal processing window. It was shown that the strength, elongation and impact energy stronglydepend on the amounts of ausferritic ferrite and retained austenite. A processing window was establishedaccording to the results of the kinetics of the isothermal transformation. The results show that the processingwindow for ADI alloyed with Cu and Ni at 350 °C was relatively wide, while the processing windowfor the isothermal transformation at 400 °C becomes narrower and shifted to the left. The processing windowof ADI austempered at 300 °C is also narrower, but shifted to the right towards the longer times comparedto the processing window of ADI austempered at 350 °C.
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