Abstract
Reinforcing a temperature resistant matrix with carbides (MMC, metal matrix composite) is expected to improve the abrasion resistance at high temperatures. Experiments show that carbides brought in during a plasma transferred arc (PTA) welding process get partly dissolved in the martensitic matrix and secondary carbide structures precipitate. Further analyses with nano-indentation and XRD show that these secondary precipitations strongly influence the properties of the originally homogeneous ductile martensitic matrix. Although hot hardness is increased, wear resistance is diminished due to changed nano-microstructural material properties.
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