Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy

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

doi:10.1038/s41598-017-03051-x

Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy

Journal Article · Tue Jun 06 04:00:00 EDT 2017 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-017-03051-x· OSTI ID:1379935

Qian, Dan ^[1]; Xue, Jiawei ^[1]; Zhang, Anfeng ^[2]; Li, Yao ^[1]; ^[3]; Song, Zhongxiao ^[1]; Chen, Kai ^[1]

Xi'an Jiaotong Univ. (China). State Key Lab. for Mechanical Behavior of Materials
Xi'an Jiaotong Univ. (China). State Key Lab. for Manufacturing Systems Engineering
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source

Ductility-dip cracking in Ni-based superalloy, resulting from heat treatment, is known to cause disastrous failure, but its mechanism is still not completely clear. A statistical study of the cracking behavior as a function of crystal orientation in a laser 3D-printed DL125L Ni-based superalloy polycrystal is investigated here using the synchrotron X-ray microdiffraction. The dislocation slip system in each of the forty crystal grains adjacent to the 300 μm long crack has been analyzed through Laue diffraction peak shapes. In all these grains, edge-type geometrically necessary dislocations (GNDs) dominate, and their dislocation line directions are almost parallel to the crack plane. Based on Schmid's law, the equivalent uniaxial tensile force direction is revealed normal to the trace of the crack. A qualitative mechanism is thus proposed. Thermal tensile stress perpendicular to the laser scanning direction is elevated due to a significant temperature gradient, and thus locations in the materials where the thermal stress exceeds the yield stress undergo plastic deformation mediated by GND activations. As the dislocations slip inside the crystal grains and pile up at the grain boundaries, local strain/stress keeps increasing, until the materials in these regions fail to sustain further deformation, leading to voids formation and cracks propagation.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1379935

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 7; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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