Ju Wang , Meng Li , Huarong Zhang , Zhe Liu , Xiaodan Li , Dengzhi Yao , Yuhang Wu , Qiong Wu , Xizhong An , Shujun Li , Jian Wang , Xing Zhang
{"title":"Cumulative effects of powder beds and melted areas on pore defects in electron beam powder bed fusion of tungsten","authors":"Ju Wang , Meng Li , Huarong Zhang , Zhe Liu , Xiaodan Li , Dengzhi Yao , Yuhang Wu , Qiong Wu , Xizhong An , Shujun Li , Jian Wang , Xing Zhang","doi":"10.1016/j.powtec.2024.119971","DOIUrl":null,"url":null,"abstract":"<div><p>In this article, meso-scale simulations and modeling on the multi-layer spreading and melting of tungsten through electron beam powder bed fusion (EB-PBF) were conducted by a three-dimensional discrete element method coupled computational fluid dynamics approach. The recurring pore defects at the edge were explored, and the cooperative effects of spreading/melting parameters on the edge pores were analyzed. On this basis, the mechanism of edge pore formation was revealed, and the occurrence frequency and edge pore size were quantified. Results show that in the multi-layer printing process, the presence of concavities will cause periodic edge pores at the end of the melted area. Increasing melting power and decreasing melting velocity will reduce the occurrence frequency and increase the average size of edge pores, while high spreading velocity and reverse direction can enlarge the total area and average size of the edge pores. The obtained highlighted results are not only of theoretical significance, but also of practical value for parametric setting and optimization in the actual EB-PBF of tungsten.</p></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.5000,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Powder Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0032591024006144","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
In this article, meso-scale simulations and modeling on the multi-layer spreading and melting of tungsten through electron beam powder bed fusion (EB-PBF) were conducted by a three-dimensional discrete element method coupled computational fluid dynamics approach. The recurring pore defects at the edge were explored, and the cooperative effects of spreading/melting parameters on the edge pores were analyzed. On this basis, the mechanism of edge pore formation was revealed, and the occurrence frequency and edge pore size were quantified. Results show that in the multi-layer printing process, the presence of concavities will cause periodic edge pores at the end of the melted area. Increasing melting power and decreasing melting velocity will reduce the occurrence frequency and increase the average size of edge pores, while high spreading velocity and reverse direction can enlarge the total area and average size of the edge pores. The obtained highlighted results are not only of theoretical significance, but also of practical value for parametric setting and optimization in the actual EB-PBF of tungsten.
期刊介绍:
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.