Influences of Post-processing, Location, Orientation, and Induced Porosity on the Dynamic Compression Behavior of Ti–6Al–4V Alloy Built Through Additive Manufacturing

被引：26

作者：

Gangireddy S. ^{[1
]}

Faierson E.J. ^{[2
]}

Mishra R.S. ^{[1
]}

机构：

[1] Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX

[2] Quad City Manufacturing Lab, Western Illinois University, Macomb, IL

来源：

Journal of Dynamic Behavior of Materials | 2018年 / 4卷 / 04期

关键词：

Additive Ti64; Dynamic properties; Orientation and location; Porosity effect; Post-processing treatments;

D O I：

10.1007/s40870-018-0157-3

中图分类号：

学科分类号：

摘要：

This paper investigates the dynamic compression behavior of Ti–6Al–4V alloy built through powder bed fusion (PBF) additive manufacturing. Samples of 45 different conditions were examined: Builds of three different orientations (vertical, horizontal, and 45° tilt), built in five different locations around the build plate (four corners and center), in as-built, stress-relieved and hot isostatically pressed conditions. High strain rate behavior was evaluated using a Split-Hopkinson Pressure Bar testing system. The as-built builds showed significant scatter with respect to both orientation and location owing to high internal stresses. Stress relief treatment resulted in a locationally uniform response but the retained columnar structure gave rise to higher strength in 45° tilt builds, along with a higher propensity for failure by shear localization. Hot isostatic pressing was found to be a necessary treatment for a truly homogeneous response that was independent of orientation and location on the build plate. A second series of samples were built in porous sandwich form with modification of processing parameters in the core to produce varying amounts of porosity. Porous samples exhibited greater energy absorption per unit volume than fully dense samples. Largest energy absorption capacity was observed in the samples with minimal porosity due to delayed failure without a significant loss in strength. © 2018, Society for Experimental Mechanics, Inc.

引用

页码：441 / 451

页数：10

共 27 条

[1]

Vilaro T., As-fabricated and heat-treated microstructures of the Ti-6Al-4V alloy processed by selective laser melting, Metall Mater Trans A, 42, 10, pp. 3190-3199, (2011)

[2]

Baufeld B., Wire based additive layer manufacturing: comparison of microstructure and mechanical properties of Ti-6Al-4V components fabricated by laser-beam deposition and shaped metal deposition, J Mater Process Technol, 211, pp. 1146-1158, (2011)

[3]

Vrancken B., Heat treatment of Ti6Al4V produced by selective laser melting: microstructure and mechanical properties, J Alloys Compd, 541, pp. 177-185, (2012)

[4]

Carroll B.E., Anisotropic tensile behavior of Ti–6Al–4V components fabricated with directed energy deposition additive manufacturing, Acta Mater, 87, pp. 309-320, (2015)

[5]

Wauthle R., Effects of build orientation and heat treatment on the microstructure and mechanical properties of selective laser melted Ti6Al4V lattice structures, Addit Manuf, 5, pp. 77-84, (2015)

[6]

Palanivel S., Spatially dependent properties in a laser additive manufactured Ti-6Al-4V component, Mater Sci Eng A, 654, pp. 39-52, (2016)

[7]

Lee W., Plastic deformation and fracture behaviour of Ti–6Al–4V alloy loaded with high strain rate under various temperatures, Mater Sci Eng A, 241, 1, pp. 48-59, (1998)

[8]

Biswas N., Deformation and fracture behavior of laser processed dense and porous Ti6Al4V alloy under static and dynamic loading, Mater Sci Eng A, 549, pp. 213-221, (2012)

[9]

Valdez M., Induced porosity in super alloy 718 through the laser additive manufacturing process: microstructure and mechanical properties, J Alloys Compd, 725, pp. 757-764, (2017)

[10]

Pattanayak D., Fabrication of bioactive porous Ti metal with structure similar to human cancellous bone by selective laser melting, Bioceram Dev Appl, (2011)

← 1 2 3 →