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Your search keyword '"Magdalena Selanec"' showing total 3 results
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3 results on '"Magdalena Selanec"'

1. Effect of hard metal production on the environment

Author

Jadranko Šubić, Ljerka Slokar Benić, Magdalena Selanec, and Žiga Erman

Subjects
powder metallurgy, production, hard metal, environment, Environmental protection, TD169-171.8
Abstract

This paper deals with production of hard metal by powder metallurgy and its effect on the environment. Hard metal is a composite material that consists of tungsten carbide as the hard refractory phase and cobalt or nickel as the soft metal binder phase. It cannot be produced by classical casting technology. Owing to its excellent properties, such as high hardness, wear and heat resistance etc., hard metal can be applied in a variety of industrial fields. Powder metallurgy is a technology for production of a wide range of materials as net-shape products from a compacted and sintered powders mixture. In this paper the impact of all stages of hard metal production by powder metallurgy on the environment is analysed. The presented analysis shows that production of hard metal by powder metallurgy has a minimum effect on the environment.

Published
2022
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2. Microstructural characterization of Cu82.3Al8.3Mn9.4 shape memory alloy after rolling

Author

Stjepan Kožuh, Mirko Gojić, Magdalena Selanec, Diana Ćubela, Tamara Holjevac Grgurić, Omer Beganović, Borut Kosec, and Ivana Ivanić

Subjects
lcsh:TN1-997, Materials science, Shape memory alloy (SMA), Annealing (metallurgy), Alloy, microstructure, 02 engineering and technology, engineering.material, continuously casting, Differential scanning calorimetry, 0203 mechanical engineering, shape memory alloy (SMA), heat treatment, rolling, lcsh:Mining engineering. Metallurgy, Austenite, Mechanical Engineering, Metallurgy, Metals and Alloys, Shape-memory alloy, 021001 nanoscience & nanotechnology, Microstructure, Continuous casting, 020303 mechanical engineering & transports, Martensite, engineering, 0210 nano-technology
Abstract

In this paper, the microstructure of Cu82.3Al8.3Mn9.4 (in wt. %) shape memory alloy after hot and cold rolling was investigated. The Cu82.3Al8.3Mn9.4 alloy was produced by a vertical continuous casting method in the form a cylinder rod of 8 mm in diameter. After the casting, hot and cold rolling was performed. By hot rolling a strip with a thickness of 1.75 mm was obtained, while by cold rolling a strip with a thickness of 1.02 mm was produced. After the rolling process, heat treatment was performed. Heat treatment was carried out by solution annealing at 900 °C held for 30 minutes and water quenched immediately after heating. The microstructure characterization of the investigated alloy was carried out by optical microscopy (OM), scanning electron microscopy (SEM) equipped with a device for energy dispersive spectroscopy (EDS). Phase transformation temperatures and fusion enthalpies were determined by differential scanning calorimetry (DSC) method. The homogenous martensite microstructure was confirmed by OM and SEM micrographs after casting. During rolling the two-phase microstructure occurred. Results of DSC analysis showed martensite start (Ms), martensite finish (Mf), austenite start (As) and austenite finish (Af) temperatures.

Published
2017

3. Troska iz procesa proizvodnje čelika elektropećnim postupkom kao mineralni agregat u cestogradnji

Author

Magdalena Selanec

Subjects
troska, proizvodni otpad, nusproizvodi, cestogradnja, agregat
Abstract

Uporaba proizvodnih otpada i/ili nusproizvoda u građevinskoj industriji, a posebno u cestogradnji, jedan je od čimbenika očuvanja prirodnih neobnovljivih izvora mineralnih agregata i istovremenog sprječavanja neželjenog utjecaja industrijskih procesa na okoliš u kojima ti otpadi i/ili nusproizvodi nastaju. Tako je posljednjih tridesetak godina u svijetu značajno porasla primjena proizvodnih otpada i/ili nusproizvoda u cestogradnji, posebno u području primjene otpadnih materijala kao što su oštećeni asfaltni slojevi, lomljeni betoni, visokopećne i čeličanske troske, leteći pepeli iz termoenergetskih postrojenja na ugljen i sl. Među proizvodnim ostatcima metalurške industrije, koji mogu biti razvrstani kao otpadi i/ili nusproizvodi, posebno značajno mjesto zauzimaju troske iz proizvodnje željeza i čelika, koje su od najranije povijesti nalazile svoju ulogu kao sekundarne sirovine i predstavljale nusproizvod procesa u kojima su nastajale u skladu sa suvremenom definicijom ovog pojma. Stoga se posljednjih nekoliko desetljeća intenzivno istražuju sve mogućnosti tzv. bezdeponijskog zbrinjavanja troske na načelima ekonomske isplativosti i ekološke prihvatljivosti. U ovom radu su prikazani podaci o čeličanskoj trosci, čija se sve šira uporaba u cestogradnji i temelji na njenim fizikalno – kemijskim i mehaničkim karakteristikama. Uz podatke o uporabi ove troske u svjetskoj i u europskoj cestogradnji, prikazani su i podaci o istraživanjima mogućnosti primjene domaće elektropećne troske kao cestograđevnog agregata.

Published
2015

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