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undergraduate thesis
Utjecaj atmosfere peći kod toplinske obrade poboljšavanja čelika H11 na mikrostrukturu i tvrdoću
2022. urn:nbn:hr:179:365569
Zekić, Sara
University of Split
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture

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Zekić, S. (2022). Utjecaj atmosfere peći kod toplinske obrade poboljšavanja čelika H11 na mikrostrukturu i tvrdoću (Undergraduate thesis). Split: University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:179:365569

Zekić, Sara. "Utjecaj atmosfere peći kod toplinske obrade poboljšavanja čelika H11 na mikrostrukturu i tvrdoću." Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, 2022. https://urn.nsk.hr/urn:nbn:hr:179:365569

Zekić, Sara. "Utjecaj atmosfere peći kod toplinske obrade poboljšavanja čelika H11 na mikrostrukturu i tvrdoću." Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, 2022. https://urn.nsk.hr/urn:nbn:hr:179:365569

Zekić, S. (2022). 'Utjecaj atmosfere peći kod toplinske obrade poboljšavanja čelika H11 na mikrostrukturu i tvrdoću', Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, accessed 17 April 2024, https://urn.nsk.hr/urn:nbn:hr:179:365569

Zekić S. Utjecaj atmosfere peći kod toplinske obrade poboljšavanja čelika H11 na mikrostrukturu i tvrdoću [Undergraduate thesis]. Split: University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture; 2022 [cited 2024 April 17] Available at: https://urn.nsk.hr/urn:nbn:hr:179:365569

S. Zekić, "Utjecaj atmosfere peći kod toplinske obrade poboljšavanja čelika H11 na mikrostrukturu i tvrdoću", Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Split, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:179:365569

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Metadata
TitleUtjecaj atmosfere peći kod toplinske obrade poboljšavanja čelika H11 na mikrostrukturu i tvrdoću
Title (english)The impact of furnace atmosphere durning tempering of H11 steel on microstructure and hardness
AuthorSara Zekić
MentorDražen Živković (mentor)
MentorZvonimir Dadić https://orcid.org/0000-0003-3272-425X (komentor)
GranterUniversity of Split
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture
Split
Defense date and country2022-09-21, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
Rad se bavi proučavanjem utjecaja atmosfere peći kod toplinske obrade poboljšavanja. Poboljšavanje je postupak koji obuhvaća kaljenje te visoko temperaturno popuštanje u cilju postizanja što veće tvrdoće. Toplinska obrada kaljenja provedena je u standardnoj atmosferi zraka i dušičnoj atmosferi. U svrhu smanjenja oksidacije i razugljičavanja neki od uzoraka omotani su folijom nehrđajućeg čelika. Eksperimentom izvršenim na 14 uzorka čelika H11 utvrđena je razlika između toplinske obrade: u standardnoj atmosferi, dušičnoj atmosferi i omotanih uzoraka. Parametri atmosfere peći kontrolirani su senzorima za postotak kisika, temperature, tlaka i relativne vlažnosti. Puštanjem plina dušika temperatura je pala s 23,7 °C na 22,7 °C, relativna vlažnost s 47% na 5%, tlak s 101 430 Pa na 101 409 Pa, volumen kisika s 20,95% na 0,9%. Na uzorcima je provedeno tvorničko sferoidizacijsko kaljenje. Nakon toplinske obrade najveću tvrdoću postigli su uzorci kaljeni u foliji (420 HV). Nešto manju tvrdoću uzorci u dušičnoj atmosferi (398 HV). Najmanju tvrdoću imaju uzorci kaljeni u standardnoj atmosferi zraka (362 HV). Metalografija uzoraka promatrana je pod optičkim svjetlosnim mikroskopom. Mikrostruktura svih uzoraka je: martenzitna, karbidna i mala količina zaostalog austenita.
Abstract (english)
This paper deals with the study of the furnace atmosphere impact durning the heat treatment of tempering. Tempering is process that involves quenching and high temperature annealing in goal to achieve highest possible hardness. Heat treatment of quenching was carried out in a standard air atmosphere and in a nitrogen atmosphere. In order to reduce oxidation and decarburization, some of the samples were wrapped in stainless steel foil. The experiment was carried out with fourteen samples of H11 steel and it was ascertained the difference between heat treatment quenching in: a standard air atmosphere, a nitrogen atmosphere and stainless steel foil. Furnace atmosphere parameters were controlled by sensors for oxygen content, temperature, pressure, and relative humidity. By purging nitrogen gas into the furnace chamber the temperature dropped from 23,7 °C to 22,7 °C, relative humidity from 47% to 5% , pressure from 101 470 Pa to 101 409 Pa, oxygen volume from 20,95% to 0,9%. Spheroidization annealing was performed on the samples. After heat treatment, samples hardened in foil achieved the highest hardness (420 HV). Samples in a nitrogen atmosphere have slightly lower hardness (398 HV). Samples hardened in a standard air atmosphere (362 HV) have the lowest hardness. The metallography of the samples was observed under an optical light microscope. The microstructure of all samples is: martensitic, carbide and a small amount of residual austenite.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:179:365569
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/ baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/ baccalaurea) inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
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Created on2023-10-19 12:33:20