Additive Manufacturing of Ti-6Al-4V Using a Pulsed Laser Beam

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11 Citations (Scopus)

Abstract

Microstructural development in directed-energy additive manufacturing of metal components is a complex process that produces parts with materials whose microstructure and properties are influenced by multiple heating and cooling cycles. Much work has been undertaken to correlate microstructural development with processing conditions, such as laser power and processing speed. Here, the microstructure and indentation hardness of a Ti-6Al-4V component processed with a pulsing laser beam and a continuous wave (CW) laser beam are investigated. It is found that the pulsed-beam build showed no statistically significant variation in lath width or indentation hardness with build height while the build deposited with the CW beam showed a statistically significant decrease in hardness and an increase in lath width near the middle of the build. The reduction in variability with beam pulsing is attributed to rapid cooling rates within the melt pool, a greater degree of melt pool stirring, and reduced aging during part build-up.

Original languageEnglish (US)
Pages (from-to)2781-2789
Number of pages9
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume46
Issue number6
DOIs
StatePublished - Jun 1 2015

Fingerprint

3D printers
Pulsed lasers
Laser beams
pulsed lasers
hardness
manufacturing
Hardness
laser beams
indentation
Indentation
Cooling
cooling
microstructure
Microstructure
Continuous wave lasers
continuous wave lasers
stirring
Processing
continuous radiation
Aging of materials

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

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abstract = "Microstructural development in directed-energy additive manufacturing of metal components is a complex process that produces parts with materials whose microstructure and properties are influenced by multiple heating and cooling cycles. Much work has been undertaken to correlate microstructural development with processing conditions, such as laser power and processing speed. Here, the microstructure and indentation hardness of a Ti-6Al-4V component processed with a pulsing laser beam and a continuous wave (CW) laser beam are investigated. It is found that the pulsed-beam build showed no statistically significant variation in lath width or indentation hardness with build height while the build deposited with the CW beam showed a statistically significant decrease in hardness and an increase in lath width near the middle of the build. The reduction in variability with beam pulsing is attributed to rapid cooling rates within the melt pool, a greater degree of melt pool stirring, and reduced aging during part build-up.",
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AU - Nassar, Abdalla Ramadan

AU - Reutzel, Edward William

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