Microstructure characteristics of spray-formed high vanadium and cobalt high speed steel |
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Authors: | ZHOU Candong ) LE Hairong ) FAN JunFei ) REN Sanbing ) ZHAO Shunli ) ) Baoshan Iron & Steel Co. Ltd. Shanghai China ) Advanced Technology Division Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai China |
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Affiliation: | ZHOU Candong1),LE Hairong2),FAN JunFei2),REN Sanbing2) and ZHAO Shunli2) 1) Baoshan Iron & Steel Co.,Ltd.,Shanghai 200940,China 2) Advanced Technology Division,Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China |
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Abstract: | The microstructure of high vanadium and cobalt high speed steel(high-V/Co HSS) and the morphology of its carbides were analyzed by optical microscope(OM),scanning electron microscope(SEM),electron probe microanalysis(EPMA),X-ray power diffraction(XRD),atomic force microscopy(AFM) and single phase erosion(SPE).The results suggest that the as-sprayed high-V/Co HSS has fine equiaxed grains(about 20 μm in size),which were homogeneously distributed.The carbides have two classical morphologies:one is fine particles(about 2 μm in size) distributed along the grain boundaries and the other is needle-like one,distributed on the grain boundaries.There are MC carbides,M2C carbides,M6C carbides and Cr2WC2 carbides in the as-sprayed high-V/Co HSS samples,however,in the as-cast high-V/Co HSS,there are MC carbides and Cr2WC2 carbides only.The SPE results show that there are two types of MC carbides in the as-sprayed HSS:the sphere one and the particle-like one.The former is about 2 μm in size and the latter is less than 1 μm,dispersed inside the grains,quite different from the MC carbides in the as-cast HSS.According to the AFM results,the skeleton-like M6C carbides of the as-sprayed high-V/Co HSS are embedded in the matrix along the grain boundaries.It is found that there are sharp membrane pieces on the carbides.Some small bamboo-shoot-like MC carbides grow from the matrix and are dispersed inside the grain.Those larger MC carbides are spherical particles embedded at the grain boundary junctions. |
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Keywords: | high-V/Co HSS microstructure carbides |
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