Wear and corrosion resistance of PTA weld surfaced Ni and CO based alloy layers

Abstract

Microstructural development in the hardfacing alloys NiCrBSi and Stellite 6 resulting from the commercially available ‘open arc’ and ‘spray and fuse’ coating techniques was compared with that resulting from the plasma transferred arc (PTA) weld surfacing process. Denser eutectic structures were observed in the case of PTA weld surfaced layers of Stellite 6 in comparison with the open arc weld surfacing process. The shapes of both carbides and borides in the 16C alloy (NiCrBSi type) coated by PTA processing were observed to have coarse morphology, while the spray and fuse layers showed needlelike morphology with finer distribution. The possible thermal history during each coating process is discussed. Based on microstructural observation, the hardness, wear resistance, and corrosion behaviours are reported. As expected, the alloy properties are directly related to the microstructural constituents.

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