Almaida Gigović-Gekić

University of Zenica

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Hasan Avdušinović

University of Zenica

Mirsada Oruč

University of Zenica

Raza Sunulahpašić

University of Zenica

Ivan Vitez

College of Slavonski Brod

Amna Hodžić

University of Sarajevo

DĆ

Diana Ćubela

University of Zenica

D. Kasapović

University of Mostar

Sead Pašić

Dzemal Bijedic University of Mostar

Milenko Rimac

University of Zenica

Mirko Gojić

University of Zagreb

Cooperative Institutions

University of Zenica

University of Belgrade

Mining and Metallurgy Institute Bor

University of Mostar

University of Prishtina

Institute for Technology of Nuclear and other Mineral Raw Materials

University of Montenegro

University of Zagreb

Institute of Technical Sciences of SASA

Virbac (France)

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Thermal and structural characteristics of a eutectic Au-Ge alloy

Materials Testing (2017)

Dragana Živković Diana Ćubela Dragan Manasijević Ljubiša Balanović Almaida Gigović-Gekić

Abstract The Au-Ge alloy is useful for bonding applications in microelectronic and optoelectronic packages. Also, recent investigations show that Au-Ge system could present a lead-free solder candidate. The results of characterization of the eutectic alloy from binary Au-Ge system are presented in this paper. Experimental research was done using thermal analysis (differential thermal analysis, DTA) and structural investigation by light optic microscopy (LOM) and scanning electron microscopy with EDS (SEM-EDS). The eutectic temperature of 359 °C was detected using thermal analysis, while eutectic structure was confirmed using microstructural analysis. Obtained results were compared with recent literature references and good mutual agreement was noticed.

Microelectronics

Eutectic bonding

Differential thermal analysis

Characterization

10.3139/120.110975

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Citations (1)

ANALYSE AND RESEARCH OF NONMETALLIC INCLUSIONS FOR STEEL 100Cr6

Almaida Gigović-Gekić M. Oruč Ivan Vitez

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Determination of the content of delta ferrite in austenitic stainless steel Nitronic 60

Almaida Gigović-Gekić Mirsada Oruč Mirko Gojić

Microstructure of austenitic stainless steel Nitronic 60 is primarily monophasic ie. austenitic. However, the chemical composition can affect on precipitation of delta ferrite. The presence of delta ferrite decrease grain growth and increases strength properties of steel. It is known that, the delta ferrite has a very important role in welding of austenitic steels to prevent the occurrence of hot cracks. This paper presents the results of determining the content the delta ferrite in steel Nitronic 60 using the Schaeffler`s diagram, metallographic methods and method of magnetic induction. Analysis of results showed no significant differences in the content of delta ferrite in relation to deifferent methods of determining the delta ferrite.

Beta ferrite

Austenitic stainless steel

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Analyse and research of nonmetallic inclusions for steel 100Cr6

DOAJ (DOAJ: Directory of Open Access Journals) (2009)

Almaida Gigović-Gekić Mirsada Oruč Ivan Vitez B. Vujičić

Steel 100Cr6 belongs to a group of hardened steels, which are applicable for production of rolling element parts. Because of specific working conditions, a proper chemical composition is required with a minimum content of nonmetallic inclusion. In this paper, the research results of presence the nonmetallic inclusions and their chemical composition are presented for the steel produced in vacuum and open induction electric furnace and their influence on the prescribed properties for this steel. The optical and scanning electronic microscope are used to identify presence and the chemical compositions of nonmetallic inclusions.

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INFLUENCE OF SIGMA PHASE ON GENERAL CORROSION OF AUSTENITIC STAINLESS STEEL

Journal of Sustainable Technologies and Materials (2022)

Amna Hodžić Dejana Kasapović Almaida Gigović-Gekić Farzet Bikić Raza Sunulahpašić

Austenitic stainless steel is mostly used at high temperatures. It is known that during heating of the austenitic stainless steel with increasing temperature and time of annealing a microstructure is changed i.e. there is the precipitation of carbides followed by precipitation of secondary phases as a sigma phase. The presence of the delta ferrite in austenitic stainless steel enhances the formation of the sigma phase. This study represents the influence of delta ferrite on the sigma phase formation and the effect of the sigma phase on general corrosion. Corrosion tests were conducted in the corrosion cell according to Standard ASTM G5, on instrument potentiostat/galvanostat, Princeton Applied Research, model 263A-2, with the software PowerCORR® (Standard, ASTM G5-94). Examinations were carried out in 1% HCl and 10% FeCl3 solutions. The Tafel extrapolation method was used for the investigation of general corrosion. The results of corrosion testing indicated that the intensity of the general corrosion increases with the increase of the delta ferrite and sigma phase contents.

Austenitic stainless steel

10.57131/jstm.2022.2.4

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Analysis of the influence of chemical composition and temperature on mechanical properties of superalloys NIMONIC 80A

Metalurgija (2014)

Raza Sunulahpašić Mirsada Oruč Mustafa Hadžalić Almaida Gigović-Gekić

Nimonic

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Influece of the austempering temperature on the tensile strength of the austempered ductile iron (ADI) samples

DOAJ (DOAJ: Directory of Open Access Journals) (2017)

Sreten Savičević Hasan Avdušinović Almaida Gigović-Gekić Zoran Jurković Milan Vukčević

Austempered Ductile Iron (ADI) is a class of ductile iron subjected to a two-step heat treatment process – austenitization and austempering. The heat treatment gives to ADI a high value of tensile strength and an especially good strength-to-weight ratio. However, designers in most cases are unfamiliar with this material that can compete favorably with steel and aluminum castings, weldments and forgings. The high tensile strength of ADI is the result of its unique ausferrite microstructure. In this paper, an investigation of the influence of the austempering temperature on the tensile strength of the ADI samples is presented.

Austempering

Ductile iron

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DETERMINATION OF DELTA FERRITE IN AUSTENITIC STAINLESS STEELS

Almaida Gigović-Gekić Hasan Avdušinović

<p style="text-align: justify;">Microstructure of an austenitic stainless steels is primarily monophasic, i.e. austenitic. However, the chemical composition of steel can affect on precipitation of a delta ferrite. The presence of the delta ferrite in austenitic stainless steel has a beneficial or detrimental effect on mechanical properties (impact and tensile) as well as on weldability and corrosion resistance. This paper presents some methods of determining the content of delta ferrite in austenitic stainless steels as well as in weld metal.</p>

Mekong Delta

10.62456/jmem.2021.01.021

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The influence of solution annealing on microstructure and mechanical properties heat-resistant cast Steel HK30 modified by Niobium

Metallurgical and Materials Engineering (2019)

Alen Delić Mirsada Oruč Milenko Rimac Almaida Gigović-Gekić Raza Sunulahpašić

In this paper, the room temperature mechanical properties, as well as the microstructure of HK 30 Nb steel, were tested in the initial as-cast and solution annealed condition. Results show that tensile properties after the solution annealing have a slightly lower value than as-cast samples. Microstructural analysis of samples after solution annealing showed dissolution of primary carbides present in the initial as-cast condition. The morphology and composition of carbides were changed during a solution annealing. Analysis of microstructure was done by optical microscopy (OM) and scanning electron microscope (SEM), whereas hardness and tensile tests were performed for characterization of mechanical properties.

Niobium carbide

Tensile testing

10.30544/430

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Citations (2)

Effect of Temperature and Time on Decomposition of δ-ferrite in Austenitic Stainless Steel

Materials and Geoenvironment (2020)

Almaida Gigović-Gekić Hasan Avdušinović Amna Hodžić Ermina Mandžuka

Abstract Microstructure of austenitic stainless steel is primarily monophasic, i.e. austenitic. However, precipitation of the δ-ferrite in the austenite matrix is possible depending on the chemical composition of steel. δ-Ferrite is stable on room temperature but it transforms into σ-phase, carbides and austenite during heat treatment. In this work, the results of analysis of influence of temperature and time on decomposition of δ-ferrite are presented. Magnetic induction method, microstructure and hardness analyses were used for testing the degree of decomposition of the δ-ferrite. Analysis of results showed that increase in temperature and time increases the degree of decomposition of δ-ferrite.

Beta ferrite

10.2478/rmzmag-2020-0007

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Citations (7)