Utjecaj usmjerene strukture na abrazijsku otpornost austenitnog nehrđajućeg čelika

undergraduate thesis

• Title (english): Effect of anisotropic structure on abrasive wear resistance of austenitic stainless steel
• Author: Juraj Šargač
• Mentor: Vera Rede (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2020-02-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Basic Technical Sciences; Materials

Abstract

Cilj ovoga rada bio je utvrditi kako usmjerenost strukture ploče austenitnog nehrđajućeg čelika oznake X2CrNiMo17-12-2 utječe na abrazijsku otpornost. U teorijskom dijelu navedene su i opisane vrste nehrđajućih čelika, osnovni mehanizmi trošenja, abrazijsko trošenje i fenomen kritične veličine abrazijskog zrna. U eksperimentalnom dijelu rada provedena je analiza mikrostrukture, izmjerena je mikrotvrdoća HV0,2 i ispitana je otpornost na abrazijsko trošenje na uređaju Taber abrader pri različitim kvalitetama brusnog papira. Rezultati ispitivanja pokazali su da usmjerenost strukture utječe na mikrotvrdoću i abrazijsku otpornost. Najveća tvrdoća izmjerena je u presjeku okomitom na smjer valjanja, a najmanji kumulativni gubitak mase na svim brusnim papirima izmjeren je na presjeku paralelnom sa smjerom valjanja. Time je potvrđeno da otpornost na abrazijsko trošenje nije uvijek u direktnoj korelaciji s tvrdoćom materijala. Kod svih uzoraka izražen je fenomen kritične veličine abrazivnog zrna.

Abstract (english)

The purpose of this paper was to determine the effect of anisotropic structure on
abrasive wear resistance of X2CrNiMo17-12-2 austenitic stainless steel plate.
The theoretical part of this paper describes various types of stainless steel, basic wear
mechanisms, especially abrasive wear and the phenomenon of critical particle size in abrasion
wear.
The experimental part consists of microstructure analysis, HV0,2 microhardness
measurement, and abrasive wear resistance test conducted on a Taber abrader device with
different qualities of abrasive papers. Test results have shown that the anisotropic structure
has an observable effect on the microhardness and abrasive wear resistance. The highest
hardness value was measured for the cross-section perpendicular to the direction of rolling,
whereas the cross-section parallel to the rolling direction had the lowest total mass loss. That
confirms the fact that abrasive wear resistance is not always in direct correlation to the
material hardness. All samples have exhibited the critical particle size phenomenon in
abrasive wear resistance tests.

• Keywords: austenitni nehrđajući čelik; usmjerenost strukture; abrazijska otpornost; kritična veličina abrazivnoga zrna
• Keywords (english): austenitic stainless steel; anisotropic structure; abrasive wear resistance; critical abrasive particle size
• Language: croatian
• URN:NBN: urn:nbn:hr:235:846947
• Study programme: Title: 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 resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-02-26 09:12:42