PREP法制备CoCrMoW合金粉末的特性及显微组织

doi:10.11896/cldb.19060192

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Abstract Cobalt-chromium alloy powders were prepared by plasma rotating electrode process (PREP) under the process parameters of 30 000 r/min. The morphology, particle size, phases and composition of the alloy powders were characterized. The results showed that the alloy powders were mainly composed of spherical particles and a small amount of special-shaped particles. The particle size was mainly distributed between 22 μm and 58 μm. The surface of the alloy powder with the particle size of d≥42.16 μm had a dendritic structures while that with the particle size of d≤27.91 μm had a partially smooth microcrystalline structure, and that with the particle size of d=27.91—42.16 μm had both cellular and dendritic structures. The insoluble W element phase was observed between grain boundaries, which acted as a pin and inhibited the growth of grains. The powder consists of γ phase, Co₇Mo₆ phase and Co₃W phase. The surface segregation was caused for Cr atoms diffused from the core of the powders to the surface. The micron powder was prepared under the condition of melt semi-diffusion resulted in different intergranular Mo and W content, due to the 30—50 μm enrichment zones of Co₇Mo₆ and Co₃W phases in the microstructure of original cast bar. The performance } caused by segregation of high melting point elements could be solved for the preparation of CoCrMoW fine powders and its random distribution during rapid prototyping process.

Key words： CoCrMoW alloy powder plasma rotating electrode process size distribution microstructure

Published: Online: 2022-05-24

CLC number:

TF122

Fund:Science and Technology Department of Jilin Province (20150204037SF).

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	Articles by authors
	SONG Ziwei
	YU Yan
	ZHU Yixin
	LIU Zhen

Cite this article:

SONG Ziwei,YU Yan,ZHU Yixin, et al. Properties and Microstructure of CoCrMoW Alloy Powder Prepared by PREP Method[J]. Materials Reports, 2022, 36(10): 19060192-5.

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http://www.mater-rep.com/EN/10.11896/cldb.19060192 OR http://www.mater-rep.com/EN/Y2022/V36/I10/19060192

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