PREP法制备CoCrMoW合金粉末的特性及显微组织  

Properties and Microstructure of CoCrMoW Alloy Powder Prepared by PREP Method

作　　者：宋子威 于燕[1] 朱义新 刘臻[3] SONG Ziwei;YU Yan;ZHU Yixin;LIU Zhen(Key Laboratory of Advanced Structural Materials and Ministry of Education,Changchun University of Technology,Changchun 130012,China;Jihua Liaoyuan Chemical Co.,Ltd.,Liaoyuan 136200,Jilin,China;Science and Technology Information Institute of Jilin Province,Changchun 130021,China)

机构地区：[1]长春工业大学先进结构材料省部共建教育部重点实验室,长春130012 [2]吉化辽源化工责任有限公司,吉林辽源136200 [3]吉林省科学技术信息研究所,长春130021

出　　处：《材料导报》2022年第10期125-129,共5页Materials Reports

基　　金：吉林省科技厅计划项目(20150204037SF)。

摘　　要：采用等离子旋转电极雾化(PREP)法在30000 r/min的工艺参数下制备了钴铬合金粉末,对粉末的形貌、粒度、物相组成以及成分进行表征。结果表明:合金粉末以球形颗粒为主,存在少量异形颗粒,粒径主要分布在22~58μm,粒径d≥42.16μm的合金粉末表面为枝晶组织,而粒径d≤27.91μm的合金粉末表面则为部分光滑的微晶组织,粒径d在27.91~42.16μm的合金粉末表面同时具有胞状晶和枝晶组织。晶界间观察到难溶的W元素相,其起到钉扎作用并抑制晶粒的长大;粉末的组成物相为γ相、Co_(7)Mo_(6)相和Co_(3)W相;Cr原子自粉末芯部向表面扩散,产生表面偏析;原始铸态棒材组织中存在30~50μm的Co_(7)Mo_(6)、Co_(3)W相富集区,熔融半扩散状态下制备微米级粉末导致粉末的颗粒间Mo、W含量不同,CoCrMoW细粉的制备与随机分布,可改善快速成形工艺中高熔点元素偏析所产生的性能缺陷。Cobalt-chromium alloy powders were prepared by plasma rotating electrode process(PREP)under the process parameters of 30000 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 22μm and 58μm.The surface of the alloy powder with the particle size of d≥42.16μm had a dendritic structures while that with the particle size of d≤27.91μm had a partially smooth microcrystalline structure,and that with the particle size of d=27.91—42.16μm 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 ofγphase,Co_(7)Mo_(6)phase and Co_(3)W 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—50μm enrichment zones of Co_(7)Mo_(6)and Co_(3)W 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.

关 键 词：钴铬钼钨合金粉末 等离子旋转电极雾化 粒度分布 显微组织 

分 类 号：TF122[冶金工程—粉末冶金]