Crystallographic texture in an additively manufactured nickel-base superalloy

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• 作者：Dong Ma^a ; ^{dongma@ornl.gov} ; Alexandru D. Stoica^a ; Zhuqing Wang^b ; Allison M. Beese^b ; ^{amb961@psu.edu}
• 关键词：Texture ; Inconel 625 ; Superalloy ; Additive manufacturing ; Neutron diffraction
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：27 January 2017
• 年：2017
• 卷：684
• 期：Complete
• 页码：47-53
• 全文大小：1367 K
• 卷排序：684

文摘

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.