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Title: A synchrotron study of defect and strain inhomogeneity in laser-assisted three-dimensionally-printed Ni-based superalloy

Abstract

Synchrotron X-ray microdiffraction was employed to investigate the inhomogeneous distribution of defect and residual strain in the transitional region between the dendritic and stray grains in a laser-assisted 3D printed Ni-based superalloy. The dendritic region was found to be under tensile strain transversely to the primary dendrite arm directions. The dendrite edges, where high level of strains and geometrically necessary dislocations were detected, were discerned as low angle grain boundaries. Lastly, high angle grain boundaries were observed in the stray grain region, and the orientation of the strain tensor in this region varied dramatically at the micron scale, in contrast with the more or less homogeneous distribution in the dendritic region.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [3]; ORCiD logo [4];  [2];  [1]
  1. Xi'an Jiaotong Univ., Shaanxi (China). Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Lab. for Mechanical Behavior of Materials
  2. Xi'an Jiaotong Univ., Shaanxi (China). State Key Lab. for Mechanical Behavior of Materials
  3. Xi'an Jiaotong Univ., Shaanxi (China). State Key Lab. for Manufacturing Systems Engineering
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1378629
Grant/Contract Number:  
AC02-05CH11231; 51302207; 51275392; 51271140; 2015CB057400; 2015gjhz03
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 18; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Solidification; 3D printing; Grain boundaries; Crystal orientation; Three dimensional image processing; inhomogeneous defects and strains; Ni-based superalloy; synchrotron X-ray microdiffraction; laser assisted 3D printing

Citation Formats

Li, Yao, Qian, Dan, Xue, Jiawei, Wan, Jingchun, Zhang, Anfeng, Tamura, Nobumichi, Song, Zhongxiao, and Chen, Kai. A synchrotron study of defect and strain inhomogeneity in laser-assisted three-dimensionally-printed Ni-based superalloy. United States: N. p., 2015. Web. doi:10.1063/1.4934839.
Li, Yao, Qian, Dan, Xue, Jiawei, Wan, Jingchun, Zhang, Anfeng, Tamura, Nobumichi, Song, Zhongxiao, & Chen, Kai. A synchrotron study of defect and strain inhomogeneity in laser-assisted three-dimensionally-printed Ni-based superalloy. United States. doi:10.1063/1.4934839.
Li, Yao, Qian, Dan, Xue, Jiawei, Wan, Jingchun, Zhang, Anfeng, Tamura, Nobumichi, Song, Zhongxiao, and Chen, Kai. Mon . "A synchrotron study of defect and strain inhomogeneity in laser-assisted three-dimensionally-printed Ni-based superalloy". United States. doi:10.1063/1.4934839. https://www.osti.gov/servlets/purl/1378629.
@article{osti_1378629,
title = {A synchrotron study of defect and strain inhomogeneity in laser-assisted three-dimensionally-printed Ni-based superalloy},
author = {Li, Yao and Qian, Dan and Xue, Jiawei and Wan, Jingchun and Zhang, Anfeng and Tamura, Nobumichi and Song, Zhongxiao and Chen, Kai},
abstractNote = {Synchrotron X-ray microdiffraction was employed to investigate the inhomogeneous distribution of defect and residual strain in the transitional region between the dendritic and stray grains in a laser-assisted 3D printed Ni-based superalloy. The dendritic region was found to be under tensile strain transversely to the primary dendrite arm directions. The dendrite edges, where high level of strains and geometrically necessary dislocations were detected, were discerned as low angle grain boundaries. Lastly, high angle grain boundaries were observed in the stray grain region, and the orientation of the strain tensor in this region varied dramatically at the micron scale, in contrast with the more or less homogeneous distribution in the dendritic region.},
doi = {10.1063/1.4934839},
journal = {Applied Physics Letters},
number = 18,
volume = 107,
place = {United States},
year = {2015},
month = {11}
}

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