Hardness and microstructural inhomogeneity at the epitaxial interface of laser 3D-printed Ni-based superalloy
Abstract
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.
- Authors:
-
- Xi'an Jiaotong Univ., Shaanxi (China). State Key Lab. for Mechanical Behavior of Materials
- Xi'an Jiaotong Univ., Shaanxi (China). State Key Lab. for Manufacturing Systems Engineering
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Xi'an Jiaotong Univ., Shaanxi (China). State Key Lab. for Manufacturing Systems Engineering
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1377476
- Alternate Identifier(s):
- OSTI ID: 1323564
- Grant/Contract Number:
- AC02-05CH11231; 51671154; 51302207; 51275392; 11132006; 2016YFB0700404; 2015CB057400; 2015gjhz03
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 109; Journal Issue: 10; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Hardness; Cladding; Epitaxy; Dislocations; Nanopowders
Citation Formats
Qian, Dan, Zhang, Anfeng, Zhu, Jianxue, Li, Yao, Zhu, Wenxin, Qi, Baolu, Tamura, Nobumichi, Li, Dichen, Song, Zhongxiao, and Chen, Kai. Hardness and microstructural inhomogeneity at the epitaxial interface of laser 3D-printed Ni-based superalloy. United States: N. p., 2016.
Web. doi:10.1063/1.4962485.
Qian, Dan, Zhang, Anfeng, Zhu, Jianxue, Li, Yao, Zhu, Wenxin, Qi, Baolu, Tamura, Nobumichi, Li, Dichen, Song, Zhongxiao, & Chen, Kai. Hardness and microstructural inhomogeneity at the epitaxial interface of laser 3D-printed Ni-based superalloy. United States. https://doi.org/10.1063/1.4962485
Qian, Dan, Zhang, Anfeng, Zhu, Jianxue, Li, Yao, Zhu, Wenxin, Qi, Baolu, Tamura, Nobumichi, Li, Dichen, Song, Zhongxiao, and Chen, Kai. 2016.
"Hardness and microstructural inhomogeneity at the epitaxial interface of laser 3D-printed Ni-based superalloy". United States. https://doi.org/10.1063/1.4962485. https://www.osti.gov/servlets/purl/1377476.
@article{osti_1377476,
title = {Hardness and microstructural inhomogeneity at the epitaxial interface of laser 3D-printed Ni-based superalloy},
author = {Qian, Dan and Zhang, Anfeng and Zhu, Jianxue and Li, Yao and Zhu, Wenxin and Qi, Baolu and Tamura, Nobumichi and Li, Dichen and Song, Zhongxiao and Chen, Kai},
abstractNote = {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.},
doi = {10.1063/1.4962485},
url = {https://www.osti.gov/biblio/1377476},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 10,
volume = 109,
place = {United States},
year = {Fri Sep 09 00:00:00 EDT 2016},
month = {Fri Sep 09 00:00:00 EDT 2016}
}
Web of Science
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Works referencing / citing this record:
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