Multi-scale microstructural investigation of a laser 3D printed Ni-based superalloy

Li, Yao; Chen, Kai; Narayan, R. Lakshmi; Ramamurty, Upadrasta; Wang, Yudong; Long, Juncheng; Tamura, Nobumichi; Zhou, Xin

doi:10.1016/j.addma.2020.101220

Multi-scale microstructural investigation of a laser 3D printed Ni-based superalloy

Journal Article · Sat Apr 25 00:00:00 EDT 2020 · Additive Manufacturing

DOI:https://doi.org/10.1016/j.addma.2020.101220· OSTI ID:1775401

Li, Yao ^[1]; Chen, Kai ^[2]; ^[3]; Ramamurty, Upadrasta ^[4]; Wang, Yudong ^[5]; Long, Juncheng ^[5]; ^[6]; Zhou, Xin ^[7]

Chang’an University (China); Xi'an Jiaotong Univ., Shaanxi (China)
Xi'an Jiaotong Univ., Shaanxi (China)
Indian Inst. of Technology (IIT), New Delhi (India)
Nanyang Technological Univ. (Singapore)
Chang’an University (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Air Force Engineering University, Xi’an (China)

The heterogeneous microstructure of a laser 3D printed Ni-based superalloy was examined at multiple length scales. The sub-millimeter-sized columnar crystal grains are composed of micron-sized cellular colonies. The crystal grains grow in epitaxy with the substrate under the large temperature gradient and high cooling rate. The cell boundaries, decorated with γ/γ' eutectics, μ-phase precipitates and high density of dislocations, show enrichment of γ' forming elements and low-angle misorientations. Dislocations trapped in the intra-cellular regions are characterized as statistically stored dislocations with no detectable contribution to lattice curvature, and are the results of the interaction between dislocations and γ' precipitates.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1775401

Alternate ID(s):: OSTI ID: 1703071

Journal Information:: Additive Manufacturing, Journal Name: Additive Manufacturing Vol. 34; ISSN 2214-8604

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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