Nucleation and growth of chimney pores during electron-beam additive manufacturing

被引：23

作者：

Cordero, Zachary C. ^{[1
]}

Dinwiddie, Ralph B. ^{[1
,2
]}

Immel, David ^{[3
]}

Dehoff, Ryan R. ^{[1
,2
]}

机构：

[1] Oak Ridge Natl Lab, Mfg Demonstrat Facil, Knoxville, TN 37932 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Savannah River Natl Lab, Savannah River Site, Aiken, SC 29808 USA

来源：

JOURNAL OF MATERIALS SCIENCE | 2017年 / 52卷 / 06期

关键词：

FILM GROWTH; LASER; TI-6AL-4V; POROSITY;

D O I：

10.1007/s10853-016-0631-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The nucleation and growth of chimney pores during powder-bed electron-beam additive manufacturing is investigated using in situ infrared thermography and micro-computed tomography. The chimney pores are found to nucleate heterogeneously at dimples on the side surfaces of additively manufactured components, and to grow through a molten-film rupture process. Further, these nucleation and growth processes are found to be strongly influenced by the beam diameter. Several strategies for suppressing the formation of chimney pores are discussed in light of these results.

引用

页码：3429 / 3435

页数：7

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