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scientific master's theses
Otpornost na trošenje ventila parne turbine
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2005. urn:nbn:hr:235:246640
Ribarić, Gordana
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Cite this document

Ribarić, G. (2005). Otpornost na trošenje ventila parne turbine (Scientific master's theses). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:246640

Ribarić, Gordana. "Otpornost na trošenje ventila parne turbine." Scientific master's theses, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2005. https://urn.nsk.hr/urn:nbn:hr:235:246640

Ribarić, Gordana. "Otpornost na trošenje ventila parne turbine." Scientific master's theses, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2005. https://urn.nsk.hr/urn:nbn:hr:235:246640

Ribarić, G. (2005). 'Otpornost na trošenje ventila parne turbine', Scientific master's theses, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 24 April 2024, https://urn.nsk.hr/urn:nbn:hr:235:246640

Ribarić G. Otpornost na trošenje ventila parne turbine [Scientific master's theses]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2005 [cited 2024 April 24] Available at: https://urn.nsk.hr/urn:nbn:hr:235:246640

G. Ribarić, "Otpornost na trošenje ventila parne turbine", Scientific master's theses, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2005. Available at: https://urn.nsk.hr/urn:nbn:hr:235:246640

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Metadata
TitleOtpornost na trošenje ventila parne turbine
Title (english)Wear resistance of steam turbine valve
AuthorGordana Ribarić
MentorVinko Ivušić (mentor)
Committee memberSlobodan Kralj (predsjednik povjerenstva)
Committee memberVinko Ivušić (član povjerenstva)
Committee memberBranko Staniša (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2005-10-01, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Universal decimal classification
(UDC)		621 - Mechanical engineering. Nuclear technology. Machinery
Abstract
Regulacijski parorazvodni ventil parne turbine u svom radu tj. funkcijskom gibanju opterećen je visokim temperaturama (θmax=535°C) i tlakom pregrijane pare (pmax=150 bar), te trošenju dijelova pozicija koje su površinski oplemenjene. Na ventilu je uočeno 7 triboparova s različitim tipovima trošenja(sklizno, udarno, abrazijsko, erozijsko trošenje i izjedanje( freeting). Svrha i cilj rada odabir je optimalnih rješenja tj.triboloških mjera izbora osnovnog materijala i postupaka oplemenjivanja površina na dijelovima ventila koji čine triboparove. U praktičnom dijelu rada su izvršena ispitivanja trošenja na abrazijsko, erozijsko i adhezijsko trošenje površinski oplemenjenih uzoraka od čelika 21CrMoV57 i X22CrMoV121. Primjenjeni su slijedeći postupci oplemenjivanja površina: ionitriranje, tvrdo REL navarivanje, tvrdo plazma navarivanje s prelaznim lukom te tvrdo JET KOTE naštrcavanje koje spada u grupu HVOF postupaka (High velocity oxy fuel spraying -naštrcavanje nadzvučnim brzinama u struji gorivog plina s kisikom). Tvrda navarivanja i naštrcavanja izvedena su s dodatnim materijalom na osnovi kobalta s karbidima (Stelit 6 sastava Co-28Cr-4W-1C). Izvršena su i mjerenja mikrotvrdoće te metalografska analiza. Rezultati ispitivanja pokazuju da najbolju otpornost na abrazijsko trošenje imaju ionitrirani uzorci, na erozijsko trošenje REL tvrdo navareni uzorci, a na adhezijsko trošenje plazma navareni uzorci. Utvrđeno je da osnovni materijal značajno utječe na mikrotvrdoću i otpornost trošenju oplemenjenih površina.
Abstract (english)
Regulating valve on steam turbine in its workings (in functional moving) is subjected to high temperatures (θmax=535°C) , high steam pressures (pmax=150 bar) and is exposed to wear on the position parts which have been surface treated.There are 7 tribopairs on each regulating valve with various observed types of wearing –adhesion, erosion, impact, fretting and abrasion wear. The purpose of this work is the selection of optimal tribological solutions – selection of base metal and tribologic protection methods on the position parts of the regulating valve tribopairs. In practical part of this work, tribologic laboratic examinations (adhesive, abrasive and erosions tests) are performed on samples of steel 21CrMoV57 and X22CrMoV121 which have been surface protected. The following protection procedures were applied - plasma nitriding, SMAW hardfacing, PTA (plasma transferred arc) hardfacing and hard spraying by JET KOTE , which belongs to HVOF spraying (High velocity oxy fuel spraying). Hardfacing and hard spraying are done with consumables of Co-base with carbides – Stellite 6 with nominal chemical composition Co-28Cr-4W-1C. Microhardness examinations and metalografic analysis are also done. Testing results show that the best resistance to abrasive wear is obtained by plasma nitriding , to erosion wear by SMAW hardfacing and to adhesion by PTA hardfacing. It can be seen that basic material has a signitific effect on microhardness and wear resistance of the surfaces treated.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:246640
Study programmeTitle: Mechanical Engineering - mr.sc.
Study programme type: university
Study level: postgraduate
Academic / professional title: magistar znanosti (magistar znanosti)
Type of resourceText
File originBorn digital
Access conditionsClosed access
Terms of useLicence In copyright icon
RepositoryRepository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb
Created on2020-12-28 13:13:18

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