Evolution of dislocation cellular pattern in Inconel 718 alloy fabricated by laser powder-bed fusion

He，Minglin1,2,3; Cao，Hailin1,2; Liu，Qian1,2; Yi，Jiang1,2; Ni，Yong3; Wang，Shuai1,2

2022-07-01

10.1016/j.addma.2022.102839

Additive Manufacturing   影响因子和分区

2214-8604

2214-8604

The dislocation cellular pattern (DCP) is a predominant microstructure in laser-based additively manufactured metals. Understanding the evolution of DCP paves the way for optimizing the laser-produced microstructure, which can ultimately modify the mechanical properties. In this work, we combined tensile test and multiscale characterization methods to systematically study the development of DCP in deformed Inconel 718 alloy that was processed with laser powder-bed fusion technique. Although the DCP has a similar appearance as the deformation-induced dislocation cell, the wall of DCP consists of solute atoms and small precipitates, which are absent in the conventional dislocation cell. The development of DCP during plastic deformation was independent of crystal orientation. The evolution process of DCP can be divided into two stages. At a tensile strain lower than 10%, the size of DCP was independent of flow stress. At higher strain levels, the DCP size decreased; however, the maximum reduction obtained at the strain-to-failure was only ~27% of the undeformed DCP size. The geometrically necessary dislocation density at DCP boundaries increased as increasing strain. Because of the interactions of dislocation tangles, solute atoms, and precipitates in the DCP wall, the DCP configuration is stabilized, and its role in deformation was neither like that of the dislocation cell nor that of the grain boundary.

Cellular pattern Dislocation structure Inconel 718 alloy Laser powder-bed fusion Strengthening

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[12025206];National Natural Science Foundation of China[51901098];Science, Technology and Innovation Commission of Shenzhen Municipality[GJHZ20200731095213039];Science, Technology and Innovation Commission of Shenzhen Municipality[KQTD2019092917250571];

Engineering ; Materials Science

Engineering, Manufacturing ; Materials Science, Multidisciplinary

WOS:000799246200003

ELSEVIER

20221812066612

Biomechanics ; Crystal orientation ; Dislocations (crystals) ; Grain boundaries ; Powder metals ; Tensile testing

Biomechanics, Bionics and Biomimetics:461.3 ; Mechanics:931.1 ; Crystal Lattice:933.1.1

2-s2.0-85129280240

Scopus

1.Shenzhen Key Laboratory of Cross-Scale Manufacturing Mechanics,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,1088 Xueyuan Avenue,518055,China
3.CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei,230026,China

He，Minglin,Cao，Hailin,Liu，Qian,et al. Evolution of dislocation cellular pattern in Inconel 718 alloy fabricated by laser powder-bed fusion[J]. Additive Manufacturing,2022,55.

He，Minglin,Cao，Hailin,Liu，Qian,Yi，Jiang,Ni，Yong,&Wang，Shuai.(2022).Evolution of dislocation cellular pattern in Inconel 718 alloy fabricated by laser powder-bed fusion.Additive Manufacturing,55.

He，Minglin,et al."Evolution of dislocation cellular pattern in Inconel 718 alloy fabricated by laser powder-bed fusion".Additive Manufacturing 55(2022).