Anisotropy in microstructural features and tensile performance of laser powder bed fusion NiTi alloys

Ge，Jinguo1,2,5; Yuan，Bo1; Chen，Hongjun1; Pan，Jiangang1; Liu，Qingyuan2; Yan，Ming3; Lu，Zhao4; Zhang，Shihong5; Zhang，Liang1

2023-05-01

10.1016/j.jmrt.2023.05.046

Journal of Materials Research and Technology   影响因子和分区

2238-7854

2214-0697

From the viewpoint of the poor formability and mechanical anisotropy of laser powder bed fusion (LPBF)-processed NiTi alloys, three different energy densities, i.e., minimum value, median value, and maximum value, were adopted in this work. The anisotropic behavior in the microstructural distribution and tensile properties were explored to evaluate the performance stability of NiTi components within a wide processing window. The results showed that an excellent deposition quality was acquired when the energy density was within the range of 45–75 J/mm. The phase constitution and microstructural features were similar even under different processing parameters. In a single melting pool, the columnar grains within the body zone exhibited {110}<001> and {100}<011> textures. However, no preferred orientation was observed for the fine dot-like sub-structures within the overlapping zone. The anisotropy in tensile strength and plasticity was mainly attributed to the columnar grains with preferred crystallographic orientation in the body zone. Only a dimple-like morphology was observed on the fracture surface, indicating a ductile tensile failure mechanism. The findings demonstrated that the stable microstructural features and tensile performance of LPBF-processed NiTi components were ensured within a wide processing window (45–75 J/mm), despite the anisotropic behavior along the transverse and longitudinal tensile directions.

Anisotropic behavior LPBF NiTi alloy Microstructural features Processing window Tensile performances

SCI ; EI

英语

其他

Natural Science Foundation of Guangxi Province[2021JJB160022];China Postdoctoral Science Foundation[2021M693230];National Outstanding Youth Science Fund Project of National Natural Science Foundation of China[51871066];National Outstanding Youth Science Fund Project of National Natural Science Foundation of China[52061007];National Outstanding Youth Science Fund Project of National Natural Science Foundation of China[52201225];Shenzhen Polytechnic[6021330015K0];Shenzhen Science and Technology Innovation Program[JSGG20200701095008016];Shenzhen Science and Technology Innovation Program[JSGG20210420091810029];Shenzhen Science and Technology Innovation Program[RCBS20221008093241051];

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:001021992000001

ELSEVIER

20232114140805

Anisotropy ; Binary alloys ; Ductile fracture ; Morphology ; Tensile strength ; Textures

Titanium and Alloys:542.3 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

2-s2.0-85159783664

Scopus

1.Institute of Intelligent Manufacturing Technology,ShenZhen Polytechnic,ShenZhen,518055,China
2.Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology,School of Mechanical and Electrical Engineering,Guilin University of Electronic Technology,China
3.Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.School of Materials Science and Engineering,Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin,541004,China
5.Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China

Ge，Jinguo,Yuan，Bo,Chen，Hongjun,et al. Anisotropy in microstructural features and tensile performance of laser powder bed fusion NiTi alloys[J]. Journal of Materials Research and Technology,2023,24:8656-8668.

Ge，Jinguo.,Yuan，Bo.,Chen，Hongjun.,Pan，Jiangang.,Liu，Qingyuan.,...&Zhang，Liang.(2023).Anisotropy in microstructural features and tensile performance of laser powder bed fusion NiTi alloys.Journal of Materials Research and Technology,24,8656-8668.

Ge，Jinguo,et al."Anisotropy in microstructural features and tensile performance of laser powder bed fusion NiTi alloys".Journal of Materials Research and Technology 24(2023):8656-8668.