Erosion Corrosion of Carbon Steels in a Laboratory Three Phase Flow

Jürgen Feyerl, Materials Center Leoben Forschung GmbH
Gregor Mori, Christian Doppler Laboratory of Localized Corrosion, Department of General, Analytical and Physical Chemistry,University of Leoben
Stefan Holzleitner, Materials Center Leoben Forschung GmbH
Joachim Haberl, Christian Doppler Laboratory of Localized Corrosion, Department of General, Analytical and Physical Chemistry,University of Leoben
Markus Oberndorfer, OMV Exploration & Production GmbH, Laboratory
Wolfgang Havlik, OMV Exploration & Production GmbH, Laboratory
Christian Monetti, AC2T research GmbH

Abstract:
High chromium martensitic steels are designed to provide high corrosion resistance in combination with high strength. Some of these steel grades contain primary carbides for improving wear resistance, e.g. the steel 440 C. The present paper mainly deals with the effect of chemical composition and microstructure on corrosion and tribological properties of recently developed steels. Different experimental alloys were produced in form of small ingots. The influence of the allying elements chromium, molybdenum and cobalt is investigated. The results indicate that corrosion resistance is improved compared to 440C. Furthe investigations were focused on heat treatments, especially on tempering temperatures. They are very important for precipitation of secondary carbides, which worsen the corrosion properties. The carbide precipitation and chromium distribution was characterized by means of energy filtered transmission electron microscopy (EFTEM). To characterize the wear properties of the developed steels, measurements with a Ball an Disc (BOD) tribometer under lubricated conditions were performed. The measured wear rates are comparable to M50, the standard bearing material for aircraft turbine bearings.

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