prikaz prve stranice dokumenta Utjecaj parametara žarenja na mikrostrukturu i svojstva austenitnog nehrđajućeg čelika X2CrNi18-9
  Download
PDF 16.51 MB
master's thesis
Utjecaj parametara žarenja na mikrostrukturu i svojstva austenitnog nehrđajućeg čelika X2CrNi18-9
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. urn:nbn:hr:235:844320
Grgec, Karlo
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

Grgec, K. (2021). Utjecaj parametara žarenja na mikrostrukturu i svojstva austenitnog nehrđajućeg čelika X2CrNi18-9 (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:844320

Grgec, Karlo. "Utjecaj parametara žarenja na mikrostrukturu i svojstva austenitnog nehrđajućeg čelika X2CrNi18-9." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:235:844320

Grgec, Karlo. "Utjecaj parametara žarenja na mikrostrukturu i svojstva austenitnog nehrđajućeg čelika X2CrNi18-9." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:235:844320

Grgec, K. (2021). 'Utjecaj parametara žarenja na mikrostrukturu i svojstva austenitnog nehrđajućeg čelika X2CrNi18-9', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 20 December 2024, https://urn.nsk.hr/urn:nbn:hr:235:844320

Grgec K. Utjecaj parametara žarenja na mikrostrukturu i svojstva austenitnog nehrđajućeg čelika X2CrNi18-9 [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2021 [cited 2024 December 20] Available at: https://urn.nsk.hr/urn:nbn:hr:235:844320

K. Grgec, "Utjecaj parametara žarenja na mikrostrukturu i svojstva austenitnog nehrđajućeg čelika X2CrNi18-9", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:235:844320

Metadata
TitleUtjecaj parametara žarenja na mikrostrukturu i svojstva austenitnog nehrđajućeg čelika X2CrNi18-9
Title (english)Effect of annealing parameters on microstructure and properties of austenitic stainless steel X2CrNi18-9
AuthorKarlo Grgec
MentorVera Rede (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2021-01-18, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
Osnovni cilj rada bio je utvrđivanje optimalnih parametara toplinske obrade zavarenog spoja na cijevima od austenitnog nehrđajućeg čelika oznake X2CrNi18-9. Cijevi su vanjskog promjera 8 mm i koriste se u rashladnim komorama. U teorijskom dijelu rada navedena je podjela nehrđajućih čelika, opisana su njihova mehanička svojstva i područja primjene. Opisano je i ponašanje navedenih čelika pri zavarivanju, posebice za austenitne nehrđajuće čelike. Eksperimentalni dio rada opisuje proces proizvodnje cijevi koje se izrađuju iz lima širine 30 mm i debljine 0,5 mm. Cijevi se zavaruju postupkom plazma zavarivanja, kalibriraju i toplinski obrađuju rastvornim žarenjem na 1050 °C. Trajanje žarenja i brzina ohlađivanja ovise o brzini prolaska cijevi kroz peć, tj. o brzini namatanja cijevi na kolut koja trenutno iznosi 0,85 m/min. Istražena je mogućnost da se povećanjem brzine poboljša produktivnost uz zadovoljavajuća svojstva zavarenog spoja. Kako bi se odredila optimalna brzina, analizirana je mikrostruktura i izmjerena mikrotvrdoća u osnovnom materijalu, metalu zavara i zoni utjecaja topline na zavarenim spojevima cijevi. Također su ispitana savojna svojstva zavarenih spojeva. Na temelju dobivenih rezultata, utvrđena je optimalna vrijednost brzine prolaska cijevi kroz peć od 1,00 m/min. Ovim režimom toplinske obrade postiže se homogena mikrostruktura, niska mikrotvrdoća i odlična savitljivost cijevi, a produktivnost u fazi toplinske obrade povećava se za oko 18 %.
Abstract (english)
The main objective of this work was to determine the optimal parameters of heat treatment of a welded joint on austenitic stainless-steel pipes grade X2CrNi18-9. The pipes have an outer diameter of 8 mm and are used in cooling chambers. The theoretical part describes the systematization of stainless steels, their mechanical properties, and areas of application. The behavior of various stainless steel during welding was described especially for austenitic stainless steels. The experimental part describes the production process of pipes, which are made of sheet metal 30 mm wide and 0.5 mm thick. The pipes are welded by plasma welding, calibrated and heat treated by annealing at 1050 ° C. The duration of annealing and the cooling rate depends on the passing speed of the pipes through the furnace, ie. on the speed of the pipe winding on the coil, which is currently used 0.85 m/min. The possibility of improving productivity by increasing the speed was investigated along with satisfactory properties of the welded joint. To determine the optimal speed, the microstructure was analyzed and the microhardness was measured in the base material, the weld metal, and the heat affected zone at the welded pipe joints. The bending properties of welded joints were also investigated. Based on the obtained results, the optimal value of the passing speed of the pipes through the furnace is 1.00 m / min. This heat treatment condition is achieves a homogeneous microstructure, low microhardness and excellent pipe flexibility, and productivity in the heat treatment phase increases by about 18%.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:844320
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2021-01-07 18:00:14