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

Li, Yao; Qian, Dan; Xue, Jiawei; Wan, Jingchun; Zhang, Anfeng; Tamura, Nobumichi; Song, Zhongxiao; Chen, Kai

doi:10.1063/1.4934839

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

Journal Article · Mon Nov 02 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4934839· OSTI ID:1378629

^[1]; Qian, Dan ^[2]; Xue, Jiawei ^[2]; Wan, Jingchun ^[2]; Zhang, Anfeng ^[3]; ^[4]; Song, Zhongxiao ^[2]; Chen, Kai ^[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
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)

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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: National Natural Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1378629

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 18 Vol. 107; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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A synchrotron study of defect and strain inhomogeneity in laser-assisted three-dimensionally-printed Ni-based superalloy

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