Abstract
CoCrMoSi alloys microstructure is affected by processing and their properties have been associated with the high volume fraction of Laves phase. However, not much has been reported on the effect of structure refinement and morphology on the properties of these alloys. This paper evaluates a CoCrMoSi alloy processed by centrifugal casting and Plasma Transferred Arc (PTA) hardfacing, aiming to understand the correlation between microstructure and properties at room temperature in the as-processed condition and following exposure at 600 °C. Characterization was carried out using scanning electron microscopy, X-ray diffraction, hardness and wear tests. The cooling rates associated with each of the processing techniques used account for the developed microstructures and associated hardness, a 626 HV
Highlights
Bearings used to support the sink roll in the processing equipment for continuous hot-dip galvanizing (HDG) lines are supplied in the cast condition
The continuous search for materials that can withstand such harsh demands led to the use of Laves phase reinforced Co-based alloys, the CoCrMoSi alloy system
This study aimed at establishing the relation between the processing microstructures of a CoCrMoSi alloy and their response after temperature exposure
Summary
Bearings used to support the sink roll in the processing equipment for continuous hot-dip galvanizing (HDG) lines are supplied in the cast condition. They operate in hostile environment involving the effects of abrasive wear, molten metal attack and temperature. Cast CoCrMoSi alloy bearings show a mean service live of 30 days in traditional galvanizing bath at 460 °C This behaviour has been attributed to the ability of the alloy to retain hardness at operating temperature[6,7]. An even more demanding service condition is presented in the hot dip galvanizing lines where the pot hardware operates in molten 55AlZn bath at 600 °C. This study aimed at establishing the relation between the processing microstructures of a CoCrMoSi alloy and their response after temperature exposure
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