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undergraduate thesis
Utjecaj rashladnog sredstva na strukturu i tvrdoću ugljičnih čelika Č1530 i Č1940
2021. urn:nbn:hr:179:665605
Giljanović, Toni
University of Split
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture
Department of Mechanical Engineering Technology

Cite this document

Giljanović, T. (2021). Utjecaj rashladnog sredstva na strukturu i tvrdoću ugljičnih čelika Č1530 i Č1940 (Undergraduate thesis). Split: University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:179:665605

Giljanović, Toni. "Utjecaj rashladnog sredstva na strukturu i tvrdoću ugljičnih čelika Č1530 i Č1940." Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:179:665605

Giljanović, Toni. "Utjecaj rashladnog sredstva na strukturu i tvrdoću ugljičnih čelika Č1530 i Č1940." Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:179:665605

Giljanović, T. (2021). 'Utjecaj rashladnog sredstva na strukturu i tvrdoću ugljičnih čelika Č1530 i Č1940', Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, accessed 29 December 2024, https://urn.nsk.hr/urn:nbn:hr:179:665605

Giljanović T. Utjecaj rashladnog sredstva na strukturu i tvrdoću ugljičnih čelika Č1530 i Č1940 [Undergraduate thesis]. Split: University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture; 2021 [cited 2024 December 29] Available at: https://urn.nsk.hr/urn:nbn:hr:179:665605

T. Giljanović, "Utjecaj rashladnog sredstva na strukturu i tvrdoću ugljičnih čelika Č1530 i Č1940", Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Split, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:179:665605

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TitleUtjecaj rashladnog sredstva na strukturu i tvrdoću ugljičnih čelika Č1530 i Č1940
Title (english)Influence of coolant on the structure and hardness of carbon steel C45 and C105W1
AuthorToni Giljanović
MentorDražen Živković (mentor)
MentorZvonimir Dadić (komentor)
GranterUniversity of Split
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture
(Department of Mechanical Engineering Technology)
Split
Defense date and country2021-09-20, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
Primjenom toplinske obrade kaljenja na ugljičnim čelicima postiže se velika tvrdoća i čvrstoća. Sastoji se od hlađenja s pravilne temperature austenitizacije da bi se postigla martenzitna struktura obratka. Hlađenje se provodi u određenom rashladnom sredstvu. Izborom rashladnog sredstva utječemo na brzinu hlađenja, a samim time na faze koje će se pojaviti u uzorku. Korištenjem TTT dijagrama može se pretpostaviti koje faze i tvrdoću možemo postići hlađenjem u određenom rashladnom sredstvu. Prilikom eksperimenta kao rashladno sredstvo korištena je voda, ulje i zrak. Hlađenjem u vodi postignuta je najveća tvrdoća zbog najveće brzine hlađenja čime je postignuta skoro stopostotna martenzitna struktura. Hlađenjem u ulju postignuta tvrdoća je nešto niža dok je kod hlađenja na zraku postignuta tvrdoća jako mala. Primjetno je kako čelici sa većim udjelom ugljika (do maksimalno 0.9%C) mogu postići veću tvrdoću.
Abstract (english)
Application of heat tretment on carbon steels is used to increase hardness and strenght. It is consisted of cooling them from proper austenitizing temperature to achieve martensite structure of taken specimen. Cooling is carried out in specific coolant. The choice of coolant affects the cooling rate and thus the phases that will appear in given specimen. Using the TTT diagram it can be assumed which phases and hardness can be achived by cooling with specific coolant. During the experiment water, oil and air have been used as the coolant. By cooling in water the highest hardness is achived due to highest cooling rate, wich achieded an almost 100% martensitic structure. By cooling in oil the achieved hardness is slightly lower, while the air cooling the achieved hardness is very lowe. It is noticeable that steels with higher carbon content (to maximum 0.9%C) can achieve higher hardness.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:179:665605
Study programmeTitle: Mechanical Engineering
Study programme type: professional
Study level: undergraduate
Academic / professional title: Stručni/Stručna prvostupnik/prvostupnica (baccalaureus/ baccalaurea) inženjer/inženjerka strojarstva (Stručni/Stručna prvostupnik/prvostupnica (baccalaureus/ baccalaurea) inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
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Created on2021-12-06 08:52:50