Creep property of Inconel 718 superalloy produced by selective laser melting compared to forging

Xu，Zhen1,2,3; Cao，Lijie2,3; Zhu，Qiang2,3; Guo，Chuan2,3; Li，Xin1,2; Hu，Xiaogang2,3; Yu，Zhengrong2,3

2020-09-09

10.1016/j.msea.2020.139947

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   影响因子和分区

0921-5093

1873-4936

Creep property and microstructure evolution of Ni-base superalloy Inconel 718 fabricated by selective laser melting (SLM) are compared to that of the forged material. Creep tests have been carried out with standard tensile specimens at 700 °C and 560 MPa. Scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) were used to investigate the microstructural evolution in both specimens after creep exposure. The SLM Inconel 718 shows poorer creep resistance and plasticity compared to the forged Inconel 718, which is associated with the microstructure in the samples of two different manufacturing processes. It is found that the SLM Inconel 718 samples have large columnar grain structure, δ phases continuously distribute at grain boundaries, and high residual stress, which leads to the initial microstructure instability during creep exposure. However, the forged Inconel 718 samples have fine equiaxed grain, more twin boundaries, micro-twin, γ′′ phase, and low residual stress before creep, which results in a low steady creep rate and excellent plastic property. Based on these results, several suggestions were provided to improve creep resistance and plasticity of SLM Inconel 718.

Creep Forging Inconel 718 Selective laser melting

SCI ; EI

英语

通讯

National Key Research and Development Program of China[2017YFB0702901] ; National Natural Science Foundation of China[91860131] ; Shenzhen Science and Technology Innovation Commission[JCYJ20170817111811303] ; Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials[ZDSYS201703031 748354]

Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000573280600002

ELSEVIER SCIENCE SA

20203108996514

High resolution transmission electron microscopy ; Textures ; Nickel alloys ; Melting ; Scanning electron microscopy ; Residual stresses ; Forging ; Selective laser melting ; Grain boundaries ; Superalloys ; Creep resistance

Metallurgy and Metallography:531 ; Metal Forming Practice:535.2.2 ; Nickel Alloys:548.2 ; Optical Devices and Systems:741.3 ; Reproduction, Copying:745.2 ; Chemical Operations:802.3 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85088651019

Scopus

1.Harbin Institute of Technology,Harbin,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,China

Xu，Zhen,Cao，Lijie,Zhu，Qiang,et al. Creep property of Inconel 718 superalloy produced by selective laser melting compared to forging[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2020,794.

Xu，Zhen.,Cao，Lijie.,Zhu，Qiang.,Guo，Chuan.,Li，Xin.,...&Yu，Zhengrong.(2020).Creep property of Inconel 718 superalloy produced by selective laser melting compared to forging.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,794.

Xu，Zhen,et al."Creep property of Inconel 718 superalloy produced by selective laser melting compared to forging".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 794(2020).