Primjena metalografskih replika tijekom plastične deformacije niskougljičnih čelika

undergraduate thesis

• Title (english): Application of metallographic replicas during plastic deformation of low carbon steel
• Author: Ante Budimir
• Mentor: Tin Brlić (mentor)
• Committee member: Ljerka Slokar Benić (predsjednik povjerenstva)
• Committee member: Tin Brlić (član povjerenstva)
• Committee member: Zoran Glavaš (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2024-07-03, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract

Poznavanje raspodjele naprezanja i deformacija te promjene u mikrostrukturi od ključne su važnosti za razumijevanje procesa koji se odvijaju tijekom plastične deformacije, odnosno oblikovanja deformiranjem u industrijskoj proizvodnji. Raspodjela promjene temperature, odnosno naprezanja, i deformacija danas se mogu detaljno odrediti metodama termografije i digitalne korelacije slike (eng. DIC - digital image correlation). Kako bi se odredile promjene u mikrostrukturi koje se javljaju tijekom plastične deformacije korištena je metoda metalografskih replika. Obzirom na vrlo kompleksnu i složenu pripremu ispitnih uzoraka za istovremeno ispitivanje metodama statičkog vlačnog ispitivanja, termografije, digitalne korelacije slike i metalografskim replikama u ovom istraživanju provedeno je ispitivanje mogućnosti primjene metalografskih replika na niskougljičnom čeliku tijekom hladne plastične deformacije uz istovremeno korištenje prehodno navedenih metoda. U odabranim točkama ispitivanja uzimane su metalografske replike s ispitne površine nakon čega je provedena analiza mikrostrukture niskougljičnog čelika. Analiza mikrostrukture i primjena metalografskih replika u ovom radu povezana je s promjenama temperature odnosno naprezanjima i deformacijama niskougljičnih čelika dobivenih metodama termografije i digitalne korelacije slike. Istraživanja su pokazala da je moguće primijeniti istovremeno metode statičkog vlačnog ispitivanja, digitalne korelacije slike, termografije i metalografskih replika tijekom plastične deformacije niskougljičnog čelika. Utvrđeno je da je s ovim načinom ispitivanja moguće, bez razaranja materijala, ispitati i povezati raspodjelu promjena temperature, odnosno naprezanja, i deformacija te mikrostrukturne promjene tijekom plastične deformacije niskougljičnog čelika, ali i ostalih metalnih materijala. Zaključeno je da se ispitivanjem mikrostrukture metalografskim replikama mogu utvrditi promjene koje su posljedice utjecaja hladne plastične deformacije.

Abstract (english)

The knowledge of stress and strain distribution and microstructural changes has a great importance for understanding the processes of plastic deformation during metal forming in industrial production. Today, the distribution of temperature changes, i.e. stress, and strains can be determined in detail using thermography and digital image correlation (DIC - digital image correlation). In order to determine the microstructure changes that occur during plastic deformation, the method of metallographic replicas was used. In this study, the possibility of applying metallographic replicas to low-carbon steel during cold plastic deformation using static tensile testing, thermography, digital image correlation and metallographic replicas simultaneously was tested, as the sample preparation for simultaneous testing with the aforementioned methods is very complex. At the selected test points, metallographic replicas were taken from the test surface and the microstructure analysis of the low-carbon steel was performed. In this work, microstructural analysis and the application of the metallographic replicas are related to the temperature changes, i.e. the stresses and strains of the low-carbon steel obtained by thermography and digital image correlation. Research has shown that it is possible to simultaneously apply static tensile testing, digital image correlation, thermography and metallographic replicas during the plastic deformation of low-carbon steel. It was found that with these test methods it is possible to investigate and relate the temperature changes, i.e. the stress and strain distribution and the microstructural changes during plastic deformation of low-carbon steels, but also of other metallic materials, without destroying the material. It was found that by examining the microstructure with metallographic replicas, it is possible to determine the changes that can be attributed to the influence of cold plastic deformation.

• Keywords: plastična deformacija; metalografske replike; niskougljični čelik; termografija; digitalna korelacija slike (DIC)
• Keywords (english): plastic deformation; metallographic replica; low-carbon steel; thermography; digital image correlation (DIC)
• Language: croatian
• URN:NBN: urn:nbn:hr:115:540592
• Study programme: Title: Undergraduate study program Metallurgy; specializations in: Metallurgical Engineering, Industrial Ecology; Course: Metallurgical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2025-07-05
• Created on: 2024-06-18 08:19:25