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Interface Characterization of Abrasion Resistant Coatings Co‐Extruded on Steel Substrates
Author(s) -
Silva P.A.,
Weber S.,
Karlsohn M.,
Theisen W.,
Reimers W.,
Pyzalla A.R.
Publication year - 2008
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200806214
Subject(s) - materials science , abrasion (mechanical) , abrasive , electron microprobe , metallurgy , scanning electron microscope , microstructure , cladding (metalworking) , coating , ultimate tensile strength , extrusion , carbide , tool steel , carbon steel , brittleness , indentation hardness , optical microscope , substrate (aquarium) , microanalysis , composite material , corrosion , oceanography , chemistry , organic chemistry , geology
Materials with high resistance against abrasive wear are of interest for many tool applications e.g. in mining industry. A special issue is the cladding of these materials to low alloyed substrates for new protection purposes. A novel manufacturing route via direct hot extrusion of bulk steel bars and pre‐sintered tool steel powders was applied. In this manner, wear resistant claddings of PM tool steels on steel substrates were obtained. The microstructures at the interfaces between the steel substrate cores and the wear resistant coatings were characterized by means of optical and scanning electron microscopy (OM and SEM/EDX) and electron‐probe microanalysis (EPMA). Hardness maps and profiles, as well as tensile tests on miniaturized samples were performed to obtain mechanical properties. Concentration profiles were calculated using the commercial software DICTRA showing a good agreement with the experiments. Carbon diffuses against the concentration gradient due to a higher activity into the substrate material leading to an increase of carbide volume fractions close to the interface. The mechanical tests show a brittle fracture region with high hardness localized about 50 μm away from the interface in the coating material.