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.
作者
宋子威
于燕
朱义新
刘臻
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)
出处
《材料导报》
EI
CAS
CSCD
北大核心
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)。
