Obstojnost orodnega jekla SITHERM S361R v staljenem aluminiju

Šmalc, Jan (author), Medved, Jože (mentor), Petrič, Mitja (co-mentor)

Orodna jekla za delo v vročem so neobhodna pri izdelavi in obdelavi aluminija in aluminijevih zlitin. Orodja za ulivanje aluminija so pogosto izdelana iz jekel: SITHERM 2367, SITHERM S361R,W 400 VMR, DIEVAR in drugih. Pri procesih, kjer se uporabljajo orodna jekla za delo v vročem, pogosto pride do kemijske in mehanske obrabe ter utrujanja materiala. Do interakcije pride zaradi kemijske reakcije med tekočim aluminijem in trdnim železom na fazni meji trdno/tekoče, pri čemer nastanejo intermetalne spojine. Zaradi strujanja staljenega aluminija po površini orodja pride posledično do erozije oziroma mehanske obrabe. Za povečanje življenjske dobe orodja, je potrebno preučiti in omejiti interakcijo med orodnim jeklom in staljenim aluminijem. V diplomskem delu smo raziskovali interakcijo med orodnim jeklom za delo v vročem in staljenim aluminijem. Izdelali smo laboratorijsko napravo, kjer lahko preiskujemo interakcijo med orodnim jeklom in kovinsko talino. Preizkuse smo izvajali v talini elektroliznega aluminija (čistosti 99,7 mas.% Al), pri temperaturi 670 °C in 700 °C ter 75 obr ∙ min−1 in 150 obr ∙ min−1. Rezultat interakcije je nastanek reakcijske plasti, ki jo sestavljajo intermetalne faze Fe-Al. Ugotovili smo, da na obrabo orodnega jekla vplivajo naslednji parametri: temperatura, hitrost vrtenja vzorcev in čas trajanja preizkusov. Na podlagi rezultatov smo izdelali model interakcije med orodnim jeklom za delo v vročem in staljenim aluminijem.

• Language: Slovenian
• Keywords: Interakcija orodno jeklo / staljeni aluminij, laboratorijski test, intermetalne faze Fe-Al.
• Work type: Bachelor thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2017
• PID: 20.500.12556/RUL-96221
• COBISS.SI-ID: 1702239
• Publication date in RUL: 27.09.2017

Secondary language

• Language: English
• Title: Stability of tool steel SITHERM S361R in molten aluminium

Abstract

Hot work tool steels are essential for production and processing aluminium and aluminium alloys. The tools wich are used for aluminium casting are often made of steel: SITHERM 2367, SITHERM S361R,W 400 VMR, DIEVAR and others. There is often chemical and mechanic wear and metal fatigue in processes where hot work tool steel is used. The interaction is a result of chemical reaction between molten aluminium and solid iron at a phase boundary solid/liquid, causing the formation of intermetallic compounds. Consequence of flow of molten aluminium along tool surface is erosion or mechanical wear. In order to increase the life time of the tool it is necessary to examine and limit the interaction between tool steel and molten aluminium. In diploma work we did a research about the interaction between hot work tool steel and molten aluminium. We created a laboratory device which we used to examine the interaction between tool steel and metalic melt. The experiments were carried out in mel of electrolytic aluminium (purity of 99,7 mas. %) at the temperature 670 °C and 700 °C and 75 rpm and 150 rpm. The result of the interaction is the growth of a reaction layer which is formed of intermetallic phases Fe-Al. We came to the conclusion that following parameters: temperature, the speed of rotating samples and experiments duration time, have an impact on the wear of tool steel. Taking the results into consideration we created an interaction model between hot work tool steel and molten aluminium.

• Keywords: Interaction tool steel / molten aluminium, laboratory test, intermetalic phases Fe-Al.