Porosity evolution in additively manufactured aluminium alloy during high temperature exposure

1st International Conference on New Material and Chemical Industry

材料科学;化学工业

Bai, J.^1,2 ; Ding, H.L.^2 ; Gu, J.L.^3 ; Wang, X.S.^2 ; Qiu, H.^2

School of Materials Science and Engineering, Northeastern University, Shenyang

110819, China^1

School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao

066004, China^2

College of Materials Science and Engineering, Yanshan University, Qinhuangdao

066004, China^3

关键词: Additive manufacturing technology;    After-heat treatment;    Cold metal transfers;    Fusion lines;    High-temperature exposure;    Material designs;    Porosity evolutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/167/1/012045/pdf
DOI  :  10.1088/1757-899X/167/1/012045

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A 2319 aluminum alloy is deposited by the Wire+Arc Additive Manufacturing technology with Cold Metal Transfer process. Porosity that are both existing in the as-deposited and as-heat treated state metal are revealed by optical microscopy and quantitatively analyzed. It explains the reason why the newly initiated pores are easily tend to gather between each layer around the fusion line zone for the WAAM metal after heat treatment. The inner morphology of the pores are demonstrated by Scanning Electron Microscopy. Porosity evolution and distribution during high temperature exposure are demonstrated. Thus two porosity growth and number increase mechanisms are proposed eventually, providing theoretical basis for related material design and process optimization.