Effects of Baume Degree of Sodium Silicate on Microstructure and Properties of Hardfacing Alloys with Composite Powder Particles and Solid Wire
High chromium wear resistant alloys were prepared by self-shielded open arc welding with composite powder particles(CPPs)and H08A solid wire.The effects of baume degree of sodium silicate on the microstructure and the properties were investigated by X-ray diffractometer(XRD),scanning electron microscopy(SEM),energy dispersive spectrometer(EDS)and wear tester.The results show that,the arc gets stabilized and the spatter decreases with the introduction of sodium silicate into powder mixtuire for granulating.With the increase of baume degree of sodium silicate,the transition coefficients of alloying elements increase and the microstructure is transited from hypoeutectic structure to hypereutectic structure,in which the volume fraction of primary M7C3 phases increases dramatically.The optimal abrasion resistance is obtained at 25 baume degree,which is 7.6 times of the one at zero degree.The abrasion resistance has improved obviously with the increase of the baume degree and the wear mechanism has changed from a coexisting style of micro-cutting and micro-spalling to a dominant one of micro-spalling.
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