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Einfluss der Kohlenstoffdiffusion auf die Gefügeausbildung und das Verschleißverhalten von Duplexstahl‐Auftragschweißungen auf Gusseisen mit Lamellengraphit
Author(s) -
Heider B.,
Oechsner M.,
Engler T.,
Ellermeier J.,
Reisgen U.,
Sharma R.,
Zokoll E.,
Gonzalez E.
Publication year - 2019
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201900129
Subject(s) - materials science , metallurgy , corrosion , microstructure , carbide , cast iron , surface layer , welding , chemical composition , tribometer , layer (electronics) , composite material , tribology , physics , thermodynamics
Surface welding with duplex stainless steel was performed to enhance the wear and corrosion properties of grey cast iron, which is used as material for applications as pump components in maritime and chemical environments. The method used for surface welding and the corresponding process parameters determine the chemical composition and microstructure, which both determine the corrosion and wear properties of the surface layer. High heat input leads to high chemical dilution and thus, reduced corrosion resistance. Slow cooling rates, which are recommended for welding of grey cast iron components, facilitate the formation of carbides in the fusion zone of the chromium‐rich duplex stainless steel surface layer. On the one hand, carbides lead to increased hardness and thus, improved wear resistance of the surface layers. On the other hand, carbides and high chemical dilution rates reduce the corrosion resistance and therefore should be avoided. Under high cooling rates, the risk of cracking in the heat affected zone of the grey cast iron increases due to martensitic phase transformations. The paper describes the correlation of process parameters, microstructure and chemical composition with a focus on carbon diffusion and carbide formation, ever considering the effect on the wear behaviour in an oscillation tribometer and under erosion‐corrosion conditions.