Nadgradnja sistema za lasersko direktno depozicijo kovinskega prahu za namen izdelave funkcionalno gradientnih materialov

Simončič, Jaka (author), Govekar, Edvard (mentor)

Funkcionalno gradientni materiali (FGM) imajo pomemben potencial na različnih inženirskih področjih kot so orodjarstvo, avtomobilska, letalska in vesoljska industrija ter energetika. Pri izdelavi FGM s procesom laserske direktne depozicije (LDD) je ključnega pomena dovod homogene mešanice prahu na mesto depozicije v ustreznem razmerju masnih deležev izbranih komponent. To zahteva ustrezno nadgradnjo obstoječega sistema za LDD kovinskega prahu. V ta namen smo okarakterizirali odzivni čas diskastega podajalnika ter čas potovanja prahu od diska do mesta depozicije ter preverili sestavo komponent mešanice prahu na mestu depozicije prahu. Na osnovi rezultatov smo prilagodili obstoječi krmilni algoritem. Z nadgrajenim sistemom smo izdelali različne primere tanko stenskih FGM vzorcev iz komponent prahu nerjavnega jekla 316L in inconela 718 ter jih ovrednotili. Iz rezultatov je razvidno, da s tovrstno nadgradnjo dosežemo ustrezna razmerja in primerno homogenost mešanice, ki zagotavljajo izdelavo FGM z željeno materialno sestavo.

• Language: Slovenian
• Keywords: funkcionalno gradientni materiali, direktna laserska depozicija, nerjavno jeklo 316L - inconel 718, sistem za dovajanje prahu, sestava komponent prahu
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [J. Simončič]
• Year: 2020
• Number of pages: XXVI, 73 str., [4] str. pril.
• PID: 20.500.12556/RUL-119180
• UDC: 621.79:669.058.66(043.2)
• COBISS.SI-ID: 28701955
• Publication date in RUL: 04.09.2020

Secondary language

• Language: English
• Title: Upgrade of the system for direct laser deposition of metal powder with an aim to fabricate functionaly graded materials

Abstract

Functionally graded materials (FGMs) have a high potential in various engineering branches such as toolmaking, energetics, automotive, and aerospace engineering. In fabrication of FGM by laser direct deposition (LDD) it is crucial to deliver homogenous mixture of powders with selected ratios of component mass flow into the deposition spot. For this purpose, the existing LDD system had to be accordingly upgraded. To achieve this, the response time of disc powder feeder and the powder travel time were characterized as well as the composition of the delivered powder was validated. Based on the results, the existing control algorithm was modified. Various examples of thin wall FGM samples composed of stainless steel 316L and Inconel 718 were fabricated with the upgraded LDD system and evaluated. The results have confirmed that using the upgraded system, the predefined ratios and homogeneity of the powder mixture were achieved, assuring fabrication of FGMs with desired material composition properties.

• Keywords: functionally graded materials, direct laser deposition, stainless steel 316L - inconel 718, powder delivery system, powder composition