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Title: Hardness and microstructural inhomogeneity at the epitaxial interface of laser 3D-printed Ni-based superalloy

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4962485· OSTI ID:1377476
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  1. Xi'an Jiaotong Univ., Shaanxi (China). State Key Lab. for Mechanical Behavior of Materials
  2. Xi'an Jiaotong Univ., Shaanxi (China). State Key Lab. for Manufacturing Systems Engineering
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  4. Xi'an Jiaotong Univ., Shaanxi (China). State Key Lab. for Manufacturing Systems Engineering
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Here in this letter, microstructural and mechanical inhomogeneities, a great concern for single crystal Ni-based superalloys repaired by laser assisted 3D printing, have been probed near the epitaxial interface. Nanoindentation tests show the hardness to be uniformly lower in the bulk of the substrate and constantly higher in the epitaxial cladding layer. A gradient of hardness through the heat affected zone is also observed, resulting from an increase in dislocation density, as indicated by the broadening of the synchrotron X-ray Laue microdiffraction reflections. Lastly, the hardening mechanism of the claddin g region, on the other hand, is shown to originate not only from high dislocation density but also and more importantly from the fine γ/γ' microstructure.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; 51671154; 51302207; 51275392; 11132006; 2016YFB0700404; 2015CB057400; 2015gjhz03
OSTI ID:
1377476
Alternate ID(s):
OSTI ID: 1323564
Journal Information:
Applied Physics Letters, Vol. 109, Issue 10; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (2)

Transition from Crystal to Metallic Glass and Micromechanical Property Change of Fe-B-Si Alloy During Rapid Solidification journal December 2019
Recent advances of two-way shape memory polymers and four-dimensional printing under stress-free conditions journal January 2020

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Related Subjects

36 MATERIALS SCIENCE
Hardness
Cladding
Epitaxy
Dislocations
Nanopowders