TY  - JOUR
AU  - Petronić, Sanja
AU  - Milovanović, Dubravka
AU  - Milosavljević, Anđelka
AU  - Radovanović, Željko
AU  - Cekić-Erić, Olivera
AU  - Jovičić, Radomir
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4279
AB  - In this paper, the influence of parameters of laser processing (drilling, cutting, welding and laser shock peening) on microstructure of superalloy Nimonic 263 are investigated. Drilling and welding process are carried out on the Nd: YAG laser model LS-HTS Mobile P160. When drilling the holes, the parameters of pulse frequency (5 Hz, 7 Hz and 9 Hz) and the pulses duration (1.8 ms to 3.6 ms) are varied. The microstructure is investigated and geometrical and metallurgical characteristics of the holes are determined.Cutting is carried out on the laser BISTRONIC, (2000), BISTAR 3015. The parameters that were varied are as follows: the average laser power, laser velocity, the pressure of the assisting gas and the focus position. Based on the geometrical characteristics of the cuts and surface morphology the optimal parameters are discussed and defined. The laser welded joints of Nimonic 263, in addition to microscopic examination and surface profilometry, were subjected to the destructive testing. During the laser shock peening, the samples were exposed to laser light at a wavelength of 1064 nm and 532 nm, with the number of accumulated pulses 50, 100 and 200. The operating laser was Nd: YAG EKSPLO, SL212P model. Structural analysis of Nimonic 263 was carried out using light microscopy, scanning electron microscopy and EDS analysis. Microhardness measurements were carried out using the Vickers method under load of 9,81N. Profilometry was performed on a contactless profilometer Zygo Newview 7100.
AB  - U ovom radu, proučavan je uticaj parametara određenih procesa laserske tehnike obrade materijala superlegure Nimonic 263 - bušenje, rezanje, zavarivanje i mehanička obrada laserom. Bušenje i zavarivanje su vršeni na laseru Nd:YAG laserom model HTS Mobile LS-P160. Prilikom bušenja rupa varirani su parametri frekvencije impulsa (5 Hz, 7Hz i 9 Hz) i dužine trajanja impulsa (1,8 ms do 3,6 ms). Ispitivana je mikrostruktura i određene su geometrijske i metalurške karakteristike rupa dobijenih ovim parametrima, na osnovu čega je izvršena optimizacija parametara obrade. Rezanje je izvedeno na laseru tipa Bistronic laser, (2000), BISTAR 3015. Varirani su parametri srednje snage lasera, brzina lasera, pritisak gasa i položaj fokusa. Na osnovu dobijenih geometrijskih karakteristika rezova i površinske morfologije diskutovani su i određeni optimalni parametri. Laserom zavareni spojevi limova legure Nimonik 263 su, osim mikroskopskih i profilometrijskih ispitivanja površina, ispitivani i metodom sa razaranjem. Prilikom laserskog deformacionog ojačavanja uzorci su bili izloženi laserskom svetlu na talasnoj dužini od 1064 nm i 532 nm, sa brojem akumuliranih impulsa: 50, 100 i 200. U svim delovima eksperimenta strukturna analiza superlegure Nimonic 263 izvedena je pomoću svetlosne mikroskopije (SM), skenirajuće elektronske mikroskopije (SEM) i EDS-analize. Merenja mikrotvrdoće vršena su pomoću metode Vikersa pod opterećenjem od 9,81N. Profilometrija je izvedena na beskontaktnom profilometru Zygo NewView 7100.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Laser treatments of Nimonic 263 nickel-based superalloy
T1  - Laserske obrade superlegure Nimonik 263
EP  - 43
IS  - 1
SP  - 26
VL  - 60
DO  - 10.5937/zasmat1901026P
ER  - 

@article{
author = "Petronić, Sanja and Milovanović, Dubravka and Milosavljević, Anđelka and Radovanović, Željko and Cekić-Erić, Olivera and Jovičić, Radomir",
year = "2019",
abstract = "In this paper, the influence of parameters of laser processing (drilling, cutting, welding and laser shock peening) on microstructure of superalloy Nimonic 263 are investigated. Drilling and welding process are carried out on the Nd: YAG laser model LS-HTS Mobile P160. When drilling the holes, the parameters of pulse frequency (5 Hz, 7 Hz and 9 Hz) and the pulses duration (1.8 ms to 3.6 ms) are varied. The microstructure is investigated and geometrical and metallurgical characteristics of the holes are determined.Cutting is carried out on the laser BISTRONIC, (2000), BISTAR 3015. The parameters that were varied are as follows: the average laser power, laser velocity, the pressure of the assisting gas and the focus position. Based on the geometrical characteristics of the cuts and surface morphology the optimal parameters are discussed and defined. The laser welded joints of Nimonic 263, in addition to microscopic examination and surface profilometry, were subjected to the destructive testing. During the laser shock peening, the samples were exposed to laser light at a wavelength of 1064 nm and 532 nm, with the number of accumulated pulses 50, 100 and 200. The operating laser was Nd: YAG EKSPLO, SL212P model. Structural analysis of Nimonic 263 was carried out using light microscopy, scanning electron microscopy and EDS analysis. Microhardness measurements were carried out using the Vickers method under load of 9,81N. Profilometry was performed on a contactless profilometer Zygo Newview 7100., U ovom radu, proučavan je uticaj parametara određenih procesa laserske tehnike obrade materijala superlegure Nimonic 263 - bušenje, rezanje, zavarivanje i mehanička obrada laserom. Bušenje i zavarivanje su vršeni na laseru Nd:YAG laserom model HTS Mobile LS-P160. Prilikom bušenja rupa varirani su parametri frekvencije impulsa (5 Hz, 7Hz i 9 Hz) i dužine trajanja impulsa (1,8 ms do 3,6 ms). Ispitivana je mikrostruktura i određene su geometrijske i metalurške karakteristike rupa dobijenih ovim parametrima, na osnovu čega je izvršena optimizacija parametara obrade. Rezanje je izvedeno na laseru tipa Bistronic laser, (2000), BISTAR 3015. Varirani su parametri srednje snage lasera, brzina lasera, pritisak gasa i položaj fokusa. Na osnovu dobijenih geometrijskih karakteristika rezova i površinske morfologije diskutovani su i određeni optimalni parametri. Laserom zavareni spojevi limova legure Nimonik 263 su, osim mikroskopskih i profilometrijskih ispitivanja površina, ispitivani i metodom sa razaranjem. Prilikom laserskog deformacionog ojačavanja uzorci su bili izloženi laserskom svetlu na talasnoj dužini od 1064 nm i 532 nm, sa brojem akumuliranih impulsa: 50, 100 i 200. U svim delovima eksperimenta strukturna analiza superlegure Nimonic 263 izvedena je pomoću svetlosne mikroskopije (SM), skenirajuće elektronske mikroskopije (SEM) i EDS-analize. Merenja mikrotvrdoće vršena su pomoću metode Vikersa pod opterećenjem od 9,81N. Profilometrija je izvedena na beskontaktnom profilometru Zygo NewView 7100.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Laser treatments of Nimonic 263 nickel-based superalloy, Laserske obrade superlegure Nimonik 263",
pages = "43-26",
number = "1",
volume = "60",
doi = "10.5937/zasmat1901026P"
}

Petronić, S., Milovanović, D., Milosavljević, A., Radovanović, Ž., Cekić-Erić, O.,& Jovičić, R.. (2019). Laser treatments of Nimonic 263 nickel-based superalloy. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(1), 26-43.
https://doi.org/10.5937/zasmat1901026P

Petronić S, Milovanović D, Milosavljević A, Radovanović Ž, Cekić-Erić O, Jovičić R. Laser treatments of Nimonic 263 nickel-based superalloy. in Zaštita materijala. 2019;60(1):26-43.
doi:10.5937/zasmat1901026P .

Petronić, Sanja, Milovanović, Dubravka, Milosavljević, Anđelka, Radovanović, Željko, Cekić-Erić, Olivera, Jovičić, Radomir, "Laser treatments of Nimonic 263 nickel-based superalloy" in Zaštita materijala, 60, no. 1 (2019):26-43,
https://doi.org/10.5937/zasmat1901026P . .

TY  - JOUR
AU  - Erić-Cekić, O.
AU  - Dojčinović, Marina
AU  - Rajnović, Dragan
AU  - Šiđanin, Leposava
AU  - Baloš, Sebastijan
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3858
AB  - In this paper, the study of cavitation behaviour of austempered ductile iron (ADI) alloyed with copper, as well as copper and nickel with a fully ausferritic microstructure, is presented. The ADI materials used were austenitized at 900 degrees C and austempered at 350 degrees C having an ausferrite microstructure with 16 and 19% of austenite, respectively. The experimental investigations were conducted using the ultrasonically induced cavitation test method. The results show that the cavitation damage was initiated at graphite nodules, as well as in the interface between a graphite nodule and an ausferrite matrix. The cavitation rate revealed that the ADI material alloyed with Cu + Ni austempered at 350 degrees C/3h has a higher cavitation resistance in water than ADI alloyed with Cu. An increased cavitation resistance of the ADI material alloyed with Cu and Ni is due to the matrix hardening by stress assisted phase transformation of austenite into the martensite (SATRAM) phenomenon.
PB  - Taylor & Francis Ltd, Abingdon
T2  - International Journal of Cast Metals Research
T1  - Microstructure and cavitation behaviour of alloyed austempered ductile irons
EP  - 287
IS  - 5
SP  - 279
VL  - 31
DO  - 10.1080/13640461.2018.1446385
ER  - 

@article{
author = "Erić-Cekić, O. and Dojčinović, Marina and Rajnović, Dragan and Šiđanin, Leposava and Baloš, Sebastijan",
year = "2018",
abstract = "In this paper, the study of cavitation behaviour of austempered ductile iron (ADI) alloyed with copper, as well as copper and nickel with a fully ausferritic microstructure, is presented. The ADI materials used were austenitized at 900 degrees C and austempered at 350 degrees C having an ausferrite microstructure with 16 and 19% of austenite, respectively. The experimental investigations were conducted using the ultrasonically induced cavitation test method. The results show that the cavitation damage was initiated at graphite nodules, as well as in the interface between a graphite nodule and an ausferrite matrix. The cavitation rate revealed that the ADI material alloyed with Cu + Ni austempered at 350 degrees C/3h has a higher cavitation resistance in water than ADI alloyed with Cu. An increased cavitation resistance of the ADI material alloyed with Cu and Ni is due to the matrix hardening by stress assisted phase transformation of austenite into the martensite (SATRAM) phenomenon.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "International Journal of Cast Metals Research",
title = "Microstructure and cavitation behaviour of alloyed austempered ductile irons",
pages = "287-279",
number = "5",
volume = "31",
doi = "10.1080/13640461.2018.1446385"
}

Erić-Cekić, O., Dojčinović, M., Rajnović, D., Šiđanin, L.,& Baloš, S.. (2018). Microstructure and cavitation behaviour of alloyed austempered ductile irons. in International Journal of Cast Metals Research
Taylor & Francis Ltd, Abingdon., 31(5), 279-287.
https://doi.org/10.1080/13640461.2018.1446385

Erić-Cekić O, Dojčinović M, Rajnović D, Šiđanin L, Baloš S. Microstructure and cavitation behaviour of alloyed austempered ductile irons. in International Journal of Cast Metals Research. 2018;31(5):279-287.
doi:10.1080/13640461.2018.1446385 .

Erić-Cekić, O., Dojčinović, Marina, Rajnović, Dragan, Šiđanin, Leposava, Baloš, Sebastijan, "Microstructure and cavitation behaviour of alloyed austempered ductile irons" in International Journal of Cast Metals Research, 31, no. 5 (2018):279-287,
https://doi.org/10.1080/13640461.2018.1446385 . .

TY  - JOUR
AU  - Dojčinović, Marina
AU  - Erić, Olivera
AU  - Rajnović, Dragan
AU  - Šiđanin, Leposava
AU  - Baloš, Sebastijan
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2430
AB  - This paper provides an in-depth study and description of cavitation damage and microstructural changes in two types of unalloyed austempered ductile iron (ADI). ADI materials used were austempered at 300 and 400 degrees C having ausferrite microstructure with 16 and 31.4% of retained austenite, respectively. Metallographic examination was carried out to study the morphology of their cavitation-damaged surfaces. Cavitation damage was initiated at graphite nodules as well as in the interface between a graphite nodule and an ausferrite matrix. Furthermore, microcracking and ferrite/retained austenite morphology were proved to be of great importance for cavitation resistance. Mass loss rate revealed that ADI austempered at 400 degrees C has a higher cavitation resistance in water than ADI austempered at 300 degrees C. A higher amount of retained austenite in ADI austempered at 400 degrees C played an important role in increasing cavitation resistance. The good cavitation behaviour of ADI austempered at 400 degrees C was due to the matrix hardening by stress assisted phase transformation of retained austenite into martensite (SATRAM) phenomenon, as shown by X-ray diffraction analysis.
PB  - Elsevier Science Inc, New York
T2  - Materials Characterization
T1  - Effect of austempering temperature on cavitation behaviour of unalloyed ADI material
EP  - 72
SP  - 66
VL  - 82
DO  - 10.1016/j.matchar.2013.05.005
ER  - 

@article{
author = "Dojčinović, Marina and Erić, Olivera and Rajnović, Dragan and Šiđanin, Leposava and Baloš, Sebastijan",
year = "2013",
abstract = "This paper provides an in-depth study and description of cavitation damage and microstructural changes in two types of unalloyed austempered ductile iron (ADI). ADI materials used were austempered at 300 and 400 degrees C having ausferrite microstructure with 16 and 31.4% of retained austenite, respectively. Metallographic examination was carried out to study the morphology of their cavitation-damaged surfaces. Cavitation damage was initiated at graphite nodules as well as in the interface between a graphite nodule and an ausferrite matrix. Furthermore, microcracking and ferrite/retained austenite morphology were proved to be of great importance for cavitation resistance. Mass loss rate revealed that ADI austempered at 400 degrees C has a higher cavitation resistance in water than ADI austempered at 300 degrees C. A higher amount of retained austenite in ADI austempered at 400 degrees C played an important role in increasing cavitation resistance. The good cavitation behaviour of ADI austempered at 400 degrees C was due to the matrix hardening by stress assisted phase transformation of retained austenite into martensite (SATRAM) phenomenon, as shown by X-ray diffraction analysis.",
publisher = "Elsevier Science Inc, New York",
journal = "Materials Characterization",
title = "Effect of austempering temperature on cavitation behaviour of unalloyed ADI material",
pages = "72-66",
volume = "82",
doi = "10.1016/j.matchar.2013.05.005"
}

Dojčinović, M., Erić, O., Rajnović, D., Šiđanin, L.,& Baloš, S.. (2013). Effect of austempering temperature on cavitation behaviour of unalloyed ADI material. in Materials Characterization
Elsevier Science Inc, New York., 82, 66-72.
https://doi.org/10.1016/j.matchar.2013.05.005

Dojčinović M, Erić O, Rajnović D, Šiđanin L, Baloš S. Effect of austempering temperature on cavitation behaviour of unalloyed ADI material. in Materials Characterization. 2013;82:66-72.
doi:10.1016/j.matchar.2013.05.005 .

Dojčinović, Marina, Erić, Olivera, Rajnović, Dragan, Šiđanin, Leposava, Baloš, Sebastijan, "Effect of austempering temperature on cavitation behaviour of unalloyed ADI material" in Materials Characterization, 82 (2013):66-72,
https://doi.org/10.1016/j.matchar.2013.05.005 . .