Properties and Microstructure of CoCrMoW Alloy Powder Prepared by PREP Method
SONG Ziwei1, YU Yan1,*, ZHU Yixin2, LIU Zhen3
1 Key Laboratory of Advanced Structural Materials and Ministry of Education, Changchun University of Technology, Changchun 130012, China 2 Jihua Liaoyuan Chemical Co., Ltd., Liaoyuan 136200, Jilin, China 3 Science and Technology Information Institute of Jilin Province ,Changchun 130021, China
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.
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2022, Vol. 36 
