Crystallographic texture in an additively manufactured nickel-base superalloy

Dong Ma, Alexandru D. Stoica, Zhuqing Wang, Allison M. Beese

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

Laser-based directed energy deposition was used to additively manufacture a wall out of pre-alloyed powder of a nickel-base superalloy−Inconel 625. The crystallographic texture of the wall has been characterized using neutron diffraction and electron backscatter diffraction. The measured pole figures show a strong Goss texture component ({011}<100>) plus a comparatively much weaker cube component ({001}<100>), both indicating that the <100>-direction of the majority of grains lies along the laser-scanning direction (or the length direction). The origin of the Goss texture is hypothesized to be a result of the preferential <100>-oriented dendritic solidification driven by the laser-induced heat flow, which is affected by the combined effect of laser power, absorption of powder, and laser scanning speed. The texture-induced mechanical softening is also presented. This study aids in understanding the processing-structure-property relationship in additive manufacturing.

Original languageEnglish (US)
Pages (from-to)47-53
Number of pages7
JournalMaterials Science and Engineering A
Volume684
DOIs
StatePublished - Jan 27 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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