3D printing of multiple metallic materials via modified selective laser melting

Additive Manufacturing (AM) technologies are considered revolutionary because they could fundamentally change the way products are designed. Selective Laser Melting (SLM) is a metal based AM process with significant and growing potential for the manufacture of aerospace components. Traditionally a material needs to be listed in the Metallic Materials Properties Development and Standardization (MMPDS) handbook if it is to be considered certified. However, this requires a considerable amount of test data to be generated on the materials mechanical properties. Therefore, the MMPDS certification process does not lend itself easily to the certification of AM components as the final component can have similar mechanical properties to wrought alloys combined with the defects associated with traditional casting and welding technologies. These defects can substantially decrease the fatigue life of a fabricated component. The primary purpose of this investigation was to study the fatigue behaviour of as-built Ti-6Al-4V (Ti64) samples. Fatigue tests were performed on the Ti-6Al-4V specimens built using SLM with a variety of layer thicknesses and build (vertical or horizontal) directions. Fractography revealed the presence of a range of manufacturing defects located at or near the surface of the specimens. The experimental results indicated that Lack-of-Fusion (LOF) defects were primarily responsible for fatigue crack initiation. The reduction in fatigue life appeared to be affected by the location, size and shape of the LOF defect.

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Development of Ultrahigh Corrosion Resistant Metallic Materials ―Improvement of Corrosion Resistance of Martensitic Stainless Steel by Selective Laser Melting Process―

Materia Japan ◽

10.2320/materia.59.679 ◽

2020 ◽

Vol 59 (12) ◽

pp. 679-684

Author(s):

Yusuke Tsutsumi ◽

Takuya Ishimoto ◽

Kyosuke Ueda ◽

Shinpei Maruyama ◽

Tetsuji Kuse ◽

...

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Selective Laser Melting ◽

Martensitic Stainless Steel ◽

Melting Process ◽

Metallic Materials ◽

Laser Melting ◽

Corrosion Resistant ◽

Selective Laser Melting Process

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Selective laser melting of typical metallic materials: An effective process prediction model developed by energy absorption and consumption analysis

Additive Manufacturing ◽

10.1016/j.addma.2018.10.046 ◽

2019 ◽

Vol 25 ◽

pp. 204-217 ◽

Cited By ~ 20

Author(s):

Y.H. Zhou ◽

Z.H. Zhang ◽

Y.P. Wang ◽

G. Liu ◽

S.Y. Zhou ◽

...

Keyword(s):

Prediction Model ◽

Energy Absorption ◽

Selective Laser Melting ◽

Metallic Materials ◽

Laser Melting ◽

Process Prediction

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Metallic Materials Prepared by Selective Laser Melting: Part Orientation Issue

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.779.165 ◽

2018 ◽

Vol 779 ◽

pp. 165-173

Author(s):

Michaela Fousova ◽

Drahomír Dvorský ◽

Pavel Lejček ◽

Dalibor Vojtěch

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Selective Laser Melting ◽

Metallic Materials ◽

Stainless Steel 316L ◽

Laser Melting ◽

Individual Effects ◽

Oriented Samples ◽

Part Orientation ◽

Melting Part

This paper shows part orientation issue in the process of Selective Laser Melting (SLM) at four examples of metallic materials (Fe, stainless steel 316L, TiAl6V4 alloy and AlSi11Mg alloy). Horizontally and vertically oriented samples differ in their mechanical properties, especially in plasticity. The causes of these differences are related to a thermal history, microstructural features and porosity. Depending on a particular material, individual effects are manifested under different extents.

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