Lasersko površinsko utrjevanje jekla Dievar

Ozmec, Rok (author), Žagar, Sebastjan (mentor), Šturm, Roman (comentor)

V magistrskem delu je preučeno lasersko površinsko utrjevanje orodnega jekla Dievar z uporabo pulznega Nd:YAG laserja ECO 2600. V literaturi je lasersko utrjevanje orodnih jekel večinoma izvedeno z industrijskimi visokozmogljivimi laserji, medtem ko so raziskave uporabe laboratorijskih Nd:YAG laserjev za ta namen redkejše. Namen raziskave je bil preveriti uporabnost laboratorijskega laserja za učinkovito površinsko utrjevanje brez ablacije materiala ter določiti optimalne procesne parametre. Eksperimentalni del je obsegal lasersko obdelavo vzorcev v treh različno toplotno obdelanih stanjih, metalografsko analizo mikrostrukture, meritve trdote in analizo hrapavosti površine. Rezultati so pokazali nastanek fine martenzitne mikrostrukture v površinskem sloju ter več kot trikratno povečanje trdote v primerjavi z osnovnim materialom. Globina in širina utrjene cone sta bili odvisni od začetne mikrostrukture materiala. Ugotovitve potrjujejo, da je z ustrezno izbiro parametrov mogoče tudi z laboratorijskim Nd:YAG laserjem doseči primerljive učinke laserskega površinskega utrjevanja kot pri industrijskih sistemih.

• Language: Slovenian
• Keywords: lasersko površinsko utrjevanje jeklo Dievar Nd:YAG laser toplotna obdelava trdota materiala metalografija hrapavost površine
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2026
• PID: 20.500.12556/RUL-179722
• Publication date in RUL: 21.02.2026

Secondary language

• Language: English
• Title: Laser surface hardening of Dievar steel

Abstract

In this master’s thesis, laser surface hardening of Dievar hot-work tool steel using a pulsed Nd:YAG ECO 2600 laser was investigated. In the literature, laser hardening of tool steels is predominantly performed using high-power industrial laser systems, whereas studies focusing on the use of laboratory Nd:YAG lasers for this purpose are less common. The aim of the research was to evaluate the applicability of a laboratory laser for effective surface hardening without material ablation and to determine optimal process parameters. The experimental work included laser treatment of specimens in three different heat-treated conditions, metallographic analysis of the microstructure, hardness measurements, and surface roughness analysis. The results showed the formation of a fine martensitic microstructure in the surface layer and more than a threefold increase in hardness compared to the base material. The depth and width of the hardened zone were found to depend on the initial microstructure of the material. The findings confirm that, with an appropriate selection of parameters, a laboratory Nd:YAG laser can achieve laser surface hardening effects comparable to those obtained with industrial laser systems.

• Keywords: laser surface hardening Dievar steel Nd:YAG laser heat treatment material hardness metallography surface roughness