Microstructure and mechanical behavior of bright crescent areas in Inconel 718 sample fabricated by selective laser melting

Yi，Jihao1,2; Kang，Jinwu2; Wang，Tianjiao3; Wang，Xiang2; Feng，Tao4; Feng，Yunlong4; Wu，Pengyue4

2021

10.1016/j.matdes.2020.109259

Materials and Design   影响因子和分区

0264-1275

1873-4197

Bright crescent areas were obviously apparent at the bottom of melt pools of Inconel 718 samples prepared by selective laser melting (SLM). Their microstructure, composition, spatial morphology, and mechanical behaviors were systematically investigated. These areas consisted of finer columnar dendrites with underdeveloped secondary arms, which resulted in a bright color under optical field and dark color under SEM. Both growth and crystal orientations were consistent with those of the grains in the melt pool of the former layer. Enrichment of elements Nb and Ti occurred among the dendrites in these areas, leading to the formation of Laves phases. The crescent areas underwent great deformation together with the melt pools during tensile testing, which showed that they were of great plasticity and no gaps or cracks were found around these areas. In addition, the bright crescent areas possessed higher hardness than that of the surrounding regions. Furthermore, the simulated temperature field results showed that the incomplete re-melting of the formed dendrites and a large number of nucleated dendrites among them are the main reasons for the formation of the bright crescent areas.

Inconel 718 Mechanical behavior Melt pool Microstructure Selective laser melting

SCI ; EI

英语

其他

National Science and TechnologyMajor Project of theMinistry of Science and Technology of China[2016YFB1100703]

Materials Science

Materials Science, Multidisciplinary

WOS:000596076700010

ELSEVIER SCI LTD

20204609482548

Crystal orientation ; Melting ; Morphology ; Lakes ; Selective laser melting ; Dendrites (metallography)

Metallography:531.2 ; Reproduction, Copying:745.2 ; Chemical Operations:802.3 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Crystal Lattice:933.1.1 ; Crystal Growth:933.1.2 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85095765349

Scopus

1.AVIC Chengdu Aircraft Industrial (Group) Co.,Ltd,Chengdu,610092,China
2.School of Materials Science and Engineering,Key Laboratory for Advanced Materials Processing Technology,Tsinghua University,Beijing,100084,China
3.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Beijing e-Plus 3D Tech. Co.,Ltd.,Beijing,100027,China

Yi，Jihao,Kang，Jinwu,Wang，Tianjiao,et al. Microstructure and mechanical behavior of bright crescent areas in Inconel 718 sample fabricated by selective laser melting[J]. Materials and Design,2021,197.

Yi，Jihao.,Kang，Jinwu.,Wang，Tianjiao.,Wang，Xiang.,Feng，Tao.,...&Wu，Pengyue.(2021).Microstructure and mechanical behavior of bright crescent areas in Inconel 718 sample fabricated by selective laser melting.Materials and Design,197.

Yi，Jihao,et al."Microstructure and mechanical behavior of bright crescent areas in Inconel 718 sample fabricated by selective laser melting".Materials and Design 197(2021).