TY - JOUR
T1 - Crystallographic texture in an additively manufactured nickel-base superalloy
AU - Ma, Dong
AU - Stoica, Alexandru D.
AU - Wang, Zhuqing
AU - Beese, Allison M.
N1 - Funding Information:
The authors gratefully acknowledge the financial support of the National Science Foundation through Award no. CMMI-1402978. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. AMB acknowledges funding from the Oak Ridge Associated Universities Ralph E. Powe Junior Faculty Enhancement Award. AM-IN625 samples were fabricated at Penn State's Center for Innovative Materials Processing through Direct Digital Deposition (CIMP-3D). A portion of this research at ORNL's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. We thank Matthew Frost for technical support.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/1/27
Y1 - 2017/1/27
N2 - 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.
AB - 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.
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U2 - 10.1016/j.msea.2016.12.028
DO - 10.1016/j.msea.2016.12.028
M3 - Article
AN - SCOPUS:85003545199
SN - 0921-5093
VL - 684
SP - 47
EP - 53
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -
