The Effect of Powder Characteristics on Build Quality of High-Purity Tungsten Produced via Laser Powder Bed Fusion (LPBF)

被引:30
|
作者
Field, A. C. [1 ,2 ]
Carter, L. N. [1 ]
Adkins, N. J. E. [1 ]
Attallah, M. M. [1 ]
Gorley, M. J. [2 ]
Strangwood, M. [1 ]
机构
[1] Univ Birmingham, Sch Met & Mat, Edgbaston B15 2TT, England
[2] UK Atom Energy Author, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2020年 / 51卷 / 03期
基金
欧盟地平线“2020”; 英国工程与自然科学研究理事会;
关键词
DENSITY;
D O I
10.1007/s11661-019-05601-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Two high-purity tungsten powders, produced via different manufacturing techniques, were characterized to determine size distribution, morphology, thermal properties, and flow characteristics and, thus, the likely suitability for Laser Powder Bed Fusion (LPBF) production. Specimens from duplicate builds were produced with the two powders and characterized for density, defect mechanisms, and thermal penetration into the substrate plate to compare apparent power densities. The first powder was a chemically reduced powder with irregular morphology and the second, a plasma spheroidized powder with highly spherical morphology. The latter was found to have tighter morphological control and size distribution, having a third of particles at the modal particle size in comparison to a fifth of the chemically reduced powder. This led to better flow characteristics, and an increase of 1.5 g cm(-3) (1500 kg m(-3)) in the packing densities seen in the powder bed which corresponds to 57 pct theoretical density vs 50 pct theoretical density in the chemically reduced powder. As a result, the specimens produced from the plasma spheroidized powder had higher densities (97.3 vs 88.5 pct) and the dominant defect mechanism moved from lack of fusion dominated in the chemically reduced powder to cracking dominated in the plasma spheroidized. The plasma spheroidized powder also showed higher apparent power densities (effective absorptivities) as evidenced by an 80 pct deeper penetration of the laser into the substrate plate.
引用
收藏
页码:1367 / 1378
页数:12
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