Table 4 - uploaded by Serge Dallaire
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Alpha Plus two-layer weld overlay properties.

Alpha Plus two-layer weld overlay properties.

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WELD OVERLAYS, more specifically chromium carbide weld overlays, have been widely used as thick coatings to protect critical plant components from abrasion wear. These thick coatings have been also considered in applications involving severe erosion, their thickness being synonymous with long life protection. Recently, boride-based arc-sprayed coat...

Contexts in source publication

Context 1
... elucidate the influence of the temperature of the first layer, a second boride-based layer (Alpha Plus) was deposited on both hot and cold previously deposited first layer using the same welding parameters. Properties of these two-layer overlays are presented in Table 4. ...
Context 2
... observed in Table 4, welding a second Alpha Plus layer on a still hot first layer enhances slightly the abrasion resistance, the hardness being not significantly affected. Applying a second layer on a hot first layer lowers the weld bead cooling rate, which likely modifies the grain size, shape and orientation. ...

Citations

... Badania nie wykazały zależności pomiędzy twardością warstw napawanych a odpornością na zużycie ścierne, co jest zbieżne z wynikami badań przedstawionych w pracach [6,7]. ...
Article
Badano wpływ zawartości niobu w samoosłonowych drutach proszkowych ze stopiwem Fe-Cr-C na twardość, strukturę oraz odporność na zużycie ścierne typu me- tal-minerał napoin jedno- i dwuwarstwowych. Stwierdzono niejednoznaczny wpływ zmiany zawartości niobu w zakresie od 4 do 10% na te właściwości w zależności od liczby warstw napawanych. Zauważono, że wyżarzanie odprężające w temperaturze 650 oC powoduje zmniejszenie twardości, jak również zwiększenie zużycia ściernego wszystkich badanych napoin. Effect of niobium on properties of hardfaced layers surface welded by Fe-Cr-C open arc flux-cored wire electrodes The influence of niobium in Fe-Cr-C open arc flux-cored wires electrodes on hardness, microstructure and abrasion resistance of overlay welds consisted of one and two layers are investigated. It was found that variation of niobium content in range from 4 to 10% has ambiguous effect on these properties depending on number of layers. It was found also that heat treatment at 650 oC cause fall dawn hardness and abrasion resistance of all investigated overlay welds.