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O: Fachverband Oberflächenphysik
O 57: Poster Session - Surface Dynamics: Phase Transitions and Elementary Processes
O 57.2: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/2OG
Oxide formation during heat treatment of stainless steel AISI 446 — •Simon Homann1,2, Cornelia Strauß1,2, and Wolfgang Maus-Friedrichs1,2 — 1Institute of Energy Research and Physical Technology, Leibnizstraße 4, 38678 Clausthal- Zellerfeld, Germany — 2Clausthal Centre of Material Science, Agricolastraße 2, 38678 Clausthal-Zellerfeld, Germany
Stainless steels are an important part of modern industry mainly because of their stability towards corrosion. The naturally forming oxide layer prevents a further degradation, which would otherwise lead to mechanical instability. At the same time, certain oxide layers also prevent the surface from wetting with braze used to join multiple workpieces, which is a known problem in the steel industry. The stainless steel used in this work (1.4762/ AISI 446) is a ferritic stainless chromium-steel containing aluminum (max. 3,3 at.%). Under heat treatment (T>450 ∘C) at normal pressure as well as typical vacuum brazing conditions (p ∼ 105 mbar) this steel forms highly stable aluminum oxides which are mainly responsible for the inability to braze the workpieces. The aim of this work is to find a relationship between temperature and the formation of aluminium oxides in ultra-high vacuum (p ∼ 10−9 mbar) and to evaluate the chemical mechanism which explains the formation or lack of formation of those aluminum oxides. X-ray photoelectron-, auger- and energy dispersive x-ray spectroscopy and scanning electron microscopy were used for chemical and structural analysis.