prikaz prve stranice dokumenta Utjecaj mikrostrukture zavara dupleks čelika na otpornost prema trošenju
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doctoral thesis
Utjecaj mikrostrukture zavara dupleks čelika na otpornost prema trošenju
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2004. urn:nbn:hr:235:238690
Rede, Vera
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

Cite this document

Rede, V. (2004). Utjecaj mikrostrukture zavara dupleks čelika na otpornost prema trošenju (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:238690

Rede, Vera. "Utjecaj mikrostrukture zavara dupleks čelika na otpornost prema trošenju." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2004. https://urn.nsk.hr/urn:nbn:hr:235:238690

Rede, Vera. "Utjecaj mikrostrukture zavara dupleks čelika na otpornost prema trošenju." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2004. https://urn.nsk.hr/urn:nbn:hr:235:238690

Rede, V. (2004). 'Utjecaj mikrostrukture zavara dupleks čelika na otpornost prema trošenju', Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 17 November 2024, https://urn.nsk.hr/urn:nbn:hr:235:238690

Rede V. Utjecaj mikrostrukture zavara dupleks čelika na otpornost prema trošenju [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2004 [cited 2024 November 17] Available at: https://urn.nsk.hr/urn:nbn:hr:235:238690

V. Rede, "Utjecaj mikrostrukture zavara dupleks čelika na otpornost prema trošenju", Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2004. Available at: https://urn.nsk.hr/urn:nbn:hr:235:238690

Metadata
TitleUtjecaj mikrostrukture zavara dupleks čelika na otpornost prema trošenju
Title (english)Influence of weldment microstructure of duplex stainless steels on wear resistance
AuthorVera Rede
MentorVinko Ivušić (mentor)
Committee memberIvan Juraga (predsjednik povjerenstva)
Committee memberVinko Ivušić (član povjerenstva)
Committee memberDragomir Krumes (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2004-04-30, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Universal decimal classification
(UDC)		669 - Metallurgy
620 - Materials testing. Power stations. Economics of energy
Abstract
U radu su opisani dupleks čelici, navedena je njihova podjela, najčešća područja primjene i svojstva, a posebna pozornost je posvećena zavarivanju dupleks čelika i mikrostrukturi zavarenog spoja. Opisano je nekoliko slučajeva trošenja koji se mogu očekivati obzirom na područje primjene dupleks čelika, te mehanizam nastanka i napredovanja rupičaste korozije. U eksperimentalnom dijelu rada napravljena je kvalitativna i kvantitativna analiza mikrostrukture uzoraka izrezanih iz valjane ploče čelika 1.4462 i toplinski obrađenih tako da im se mikrostruktura što više podudara sa mikrostrukturom realnog zavarenog spoja koja je također analizirana. Istraživan je utjecaj porasta volumnog udjela sigma faze (dobiven žarenjem na 800°C) te utjecaj porasta omjera ferit/austenit (dobiven žarenjem na temperaturi od 1100 do 1300°C) na otpornost prema abrazijskom i erozijskom trošenju, otpornost brazdanju te otpornost trošenju izazvanom kavitacijskom erozijom. Ispitan je i utjecaj erozije na otpornost rupičastoj koroziji kod svih uzoraka. Utvrđeno je da mikrostrukturne promjene nastale u metalu zavara i zoni utjecaja topline imaju veliki utjecaj na otpornost prema trošenju ispitanih slučajeva te da povećanje volumnog udjela sigma faze u mikrostrukturi značajno povećava utjecaj erozije na smanjenje otpornosti rupičastoj koroziji.
Abstract (english)
In this work, duplex steels are described, along with their classification, most common application and properties, while particular attention is paid to welding of duplex steels and weldment microstructure. Several cases of wearing which can happen as a result of duplex steel application are described, as well as appearance and progression of pitting corrosion. In experimental part of the work, qualitative and quantitative analysis of the sample microstructure was performed. The sample was cut out from the rolled steel plate of 1.4462 grade and heat treated in order to obtain the microstructure which would, as much as possible match the actual weldment microstructure, which was analyzed as well. Increase of volume portion of the sigma-phase (obtained by annealing at 800°C) was investigated, as well as how increase of the ferrite/austenite ratio (obtained by annealing at the temperature from 1100 to 1300°C) influences resistance to abrasive and erosion wear, resistance to grooving and resistance to wearing caused by cavitation erosion. Influence of erosion on resistance to pitting corrosion was investigated for all samples. It was found that microstructural changes which appeared in the weld metal and in the heat affected zone significantly influence resistance to wearing in the investigated cases, as well as that increase of volume portion of the sigma-phase in microstructure significantly increases influence of erosion on decreasing of resistance to pitting corrosion
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:238690
Study programmeTitle: Mechanical Engineering and Naval Architecture
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti (doktor/doktorica znanosti, područje tehničkih znanosti)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
Terms of useLicence In copyright icon
Created on2020-12-28 13:01:06