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Sintering and Wear Behavior of a FeCrCB Hardfacing Alloy Applied by Tape Casting: A Study of Cooling Rate Effect

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Document pages: 14 pages

Abstract: This study presents a simple process to deposit a hardfacing coating on asteel substrate, based on the sintering of metallic powder applied by tapecasting (by a slurry of metallic powder suspension onto a steel substrate) thusavoiding the use of traditional welding processes and their variants. Theeffect of the cooling of hardfacing after the sintering process, by air at roomtemperature or by quenching in water, was studied. This new method ensures agood metallurgical bonding between the substrate steel and the hardfacing layerand shows mechanical property improvement on coated pieces, similar to thoseexhibited by hardfacing coatings produced by several kinds of weldingprocesses. The characterization of the hardfacing coatings was made by X-ray diffraction,optical microscopy, scanning electron microscopy, microhardness and wearresistance according to the ASTM G65 standard. The characterization results show that the presented faces are: M7C3,M3C, MC, M2B and M23B6; there arethree different phases in the micrograph glass phase, eutectic phase and hardphase with a volumetric fraction of 0.14, 0.20 and 0.66, respectively, for theair cooled and 0.15, 0.16 and 0.69 when quenched in water. The averagemicrohardness value for the parts cooled in air was 832.5 HV and for thatcooled in water was 958.9 HV, and the wear resistance was a mass loss of 0.219and 0.128 g for parts cooled in air and water, respectively. These results showthat the hardfacing coating could have twice the hardness and wear resistancethan that observed for the boron steel used as a substrate.

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