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Toplotna obdelava navarov iz maraging jekla
Kocjančič, Jaša (Author), Šturm, Roman (Mentor) More about this mentor... This link opens in a new window, Klobčar, Damjan (Co-mentor)

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Abstract
Maraging jekla se uporabljajo za namene, kjer želimo oz. potrebujemo material z dobrimi mehanskimi lastnostmi kot so trdota, trdnost dobra varivost, žilavost itd. Želje in zahteve po zniževanju stroškov ter časovni omejitvi izdelave izdelkov so vedno bolj v ospredju, zato so v porastu aditivne tehnologije, ki se uporabljajo predvsem za izdelavo kompleksnejših izdelkov. Na začetku diplomske naloge so predstavljene teoretične osnove varjenja, ki temeljijo na MIG/MAG postopku, varilna oprema, predstavljene so aditivne tehnologije ter ostali uporabljeni postopki za samo izvedbo ter analizo toplotne obdelave. Naloga zajema navarjanje maraging jekla v ravno navpično steno s postopkom MIG/MAG z varilnim programom CMT+ pulz z varilno žico Capilla 2709 MAG. Izrezani vzorci navarjenje stene so bili toplotno obdelani, nato metalografsko analizirani in preizkušeni na trdoto po Vickersu. Ugotavljali smo odvisnost temperature in časa same toplotne obdelave na mehanske in kemične lastnosti materiala. Ugotovili smo, da mikrostruktura materiala v navarjenem stanju grobozrnata in nehomogena. S toplotno obdelavo se izločijo precipitati, mikrostruktura postane homogena, trdota pa se poveča. Povečanje trdote je odvisna od izbire toplotne obdelave, saj napačna toplotna obdelava lahko nasprotuje našim ciljem.

Language:Slovenian
Keywords:MIG/MAG varjenje, CMT varjenje, maraging jeklo, aditivne tehnologije, WAAM, navarjanje, toplotna obdelava
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Year:2020
Publisher:[J. Kocjančič]
Number of pages:XXII, 49 str.
UDC:621.791.75:669.14(043.2)
COBISS.SI-ID:27484419 This link opens in a new window
Views:247
Downloads:120
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Secondary language

Language:English
Title:Heat treatment of welds of maraging steel
Abstract:
Maraging steels are used where we wish or we need a material with good mechanical properties such as hardness, strength, good weldability, toughness, etc. Desires and demands for cost reductions and time constraints on product manufacturing are increasingly at the forefront, so additive technologies, which are used primarily to make more complex products, are on the rise. At the beginning of the graduation, theoretical basics of welding based on the MIG / MAG process are presented, welding equipment, additive technologies are presented, as well as other applied procedures for the very implementation and analysis of heat treatment. The task involves welding maraging steel into a flat vertical wall using the MIG / MAG process with CMT + pulse welding machine with Capilla 2709 MAG welding wire. The carved wall welding specimens were heat treated, then metallographically analysed and Vickers hardness tested. We determined the dependence of temperature and time of the heat treatment on the mechanical and chemical properties of the material. We find that the microstructure of the material in the welded state is coarse-grained and inhomogeneous. Precipitates are eliminated by heat treatment, the microstructure becomes homogeneous and the hardness increases. The increase in hardness depends on the choice of heat treatment, as incorrect heat treatment can contradict our goals.

Keywords:MIG/MAG welding, CMT welding, maraging steel, additive technologies, WAAM, heat treatment

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