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Microstructure and Properties of Cobalt-based Alloy Plasma Spray Welding

Gao Jia-sheng

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Abstract

The microstructure and microhardness of cobalt-based alloy plasma spray welding were investigated using optical metalography (OP), scanning electron microscopy (SEM), X-ray diffraction (XRD) and microhardness test. The changing of phase and microhardness of the cobalt-based alloy layer during aging was also studied. The results showed that cobalt-based alloy layer is composed of γ-Co and (Cr,Fe)_7C_3, the microstructure could be divided into three different layers, and the hypoeutectic structure is shown. On the other hand, the phase of the alloy layer changed with aging, and (Cr,Fe)_7C_3 changed into Cr_(23)C_6. The microhardness of the fine dendrite zone increased about 29% after aging. And the precipitation of new phase during aging was the reasons for the changing of microhardness of the fine dendrite zone.

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What this paper is about

The microstructure and microhardness of cobalt-based alloy plasma spray welding were investigated using optical metalography (OP), scanning electron microscopy (SEM), X-ray diffraction (XRD) and microhardness test. The changing of phase and microhardness of the cobalt-based alloy layer during aging was also studied. The results showed that cobalt-based alloy layer is composed of γ-Co and (Cr,Fe)_7C_3, the microstructure could be divided into three different layers, and the hypoeutectic structure is shown. On the other hand, the phase of the alloy layer changed with aging, and (Cr,Fe)_7C_3 changed into Cr_(23)C_6. The microhardness of the fine dendrite zone increased about 29% after aging. And the precipitation of new phase during aging was the reasons for the changing of microhardness of the fine dendrite zone.

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Available abstract

The microstructure and microhardness of cobalt-based alloy plasma spray welding were investigated using optical metalography (OP), scanning electron microscopy (SEM), X-ray diffraction (XRD) and microhardness test. The changing of phase and microhardness of the cobalt-based alloy layer during aging was also studied. The results showed that cobalt-based alloy layer is composed of γ-Co and (Cr,Fe)_7C_3, the microstructure could be divided into three different layers, and the hypoeutectic structure is shown. On the other hand, the phase of the alloy layer changed with aging, and (Cr,Fe)_7C_3 changed into Cr_(23)C_6. The microhardness of the fine dendrite zone increased about 29% after aging. And the precipitation of new phase during aging was the reasons for the changing of microhardness of the fine dendrite zone.

Key concepts: Materials science, Microstructure, Indentation hardness, Alloy, Metallurgy, Cobalt, Scanning electron microscope, Layer (electronics)

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