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

Abstract 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 supera...

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Autores principales:	Dan Qian, Jiawei Xue, Anfeng Zhang, Yao Li, Nobumichi Tamura, Zhongxiao Song, Kai Chen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0509c68002f7470da47f20ea1e067d3e
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spelling	oai:doaj.org-article:0509c68002f7470da47f20ea1e067d3e2021-12-02T12:32:30ZStatistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy10.1038/s41598-017-03051-x2045-2322https://doaj.org/article/0509c68002f7470da47f20ea1e067d3e2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03051-xhttps://doaj.org/toc/2045-2322Abstract 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.Dan QianJiawei XueAnfeng ZhangYao LiNobumichi TamuraZhongxiao SongKai ChenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Dan Qian Jiawei Xue Anfeng Zhang Yao Li Nobumichi Tamura Zhongxiao Song Kai Chen Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy
description	Abstract 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.
format	article
author	Dan Qian Jiawei Xue Anfeng Zhang Yao Li Nobumichi Tamura Zhongxiao Song Kai Chen
author_facet	Dan Qian Jiawei Xue Anfeng Zhang Yao Li Nobumichi Tamura Zhongxiao Song Kai Chen
author_sort	Dan Qian
title	Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy
title_short	Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy
title_full	Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy
title_fullStr	Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy
title_full_unstemmed	Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy
title_sort	statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3d printed ni-based superalloy
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/0509c68002f7470da47f20ea1e067d3e
work_keys_str_mv	AT danqian statisticalstudyofductilitydipcrackinginducedplasticdeformationinpolycrystallinelaser3dprintednibasedsuperalloy AT jiaweixue statisticalstudyofductilitydipcrackinginducedplasticdeformationinpolycrystallinelaser3dprintednibasedsuperalloy AT anfengzhang statisticalstudyofductilitydipcrackinginducedplasticdeformationinpolycrystallinelaser3dprintednibasedsuperalloy AT yaoli statisticalstudyofductilitydipcrackinginducedplasticdeformationinpolycrystallinelaser3dprintednibasedsuperalloy AT nobumichitamura statisticalstudyofductilitydipcrackinginducedplasticdeformationinpolycrystallinelaser3dprintednibasedsuperalloy AT zhongxiaosong statisticalstudyofductilitydipcrackinginducedplasticdeformationinpolycrystallinelaser3dprintednibasedsuperalloy AT kaichen statisticalstudyofductilitydipcrackinginducedplasticdeformationinpolycrystallinelaser3dprintednibasedsuperalloy
_version_	1718394018110373888

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

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