Influence of Co content on the microstructures and mechanical properties of a Ni-Co base superalloy made by specific additive manufacturing process

被引：21

作者：

Tang, Ling ^{[1
,2
]}

Liang, Jingjing ^{[1
,3
]}

Cui, Chuanyong ^{[1
]}

Li, Jinguo ^{[1
,3
]}

Zhou, Yizhou ^{[1
]}

Sun, Xiaofeng ^{[1
]}

Ding, Yutian ^{[4
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China

[2] Univ Sci & Technol China, Sch Mat Sci & Engn, 96 Jinzhai Rd, Hefei 230026, Peoples R China

[3] Space Mfg Technol CAS Key Lab, Beijing 100094, Peoples R China

[4] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, 287 Langongping Rd, Lanzhou 730000, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 786卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Additive manufacturing; Ni-Co base Superalloy; Tensile strength; Deformation mechanism; ETA-PHASE; PRECIPITATION; EVOLUTION;

D O I：

10.1016/j.msea.2020.139438

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Microstructures and tensile properties of a Ni-Co base superalloy containing different Co contents made by additive manufacturing (AM) after standard heat treatment have been investigated. Microstructure observation by scanning electron microscopy (SEM) reveals that a great deal of eta precipitates form in the interdendritic region and distribute linearly along the columnar microstructure in 5Co alloy. In addition, transmission electron microscopy (TEM) results reveal that spherical gamma' phase can be found in 5Co alloy and nearly cuboidal gamma' phase can been observed in 23Co alloy. The different morphologies of the gamma' precipitate can be attributed to the different gamma' compositions and the differences in gamma/gamma' lattice misfit in the two alloys. The results of tensile tests reveal that, when tested below 500 degrees C, the ultimate strength and the elongation of the alloys made by AM are lower than that of the cast & wrought (C&W) alloys. When tested at 750 degrees C and 800 degrees C, alloys made by AM exhibit higher yield strength and superior plasticity. With the increment of the testing temperature, deformation mechanism of the alloys transforms from dislocation glide to stacking fault shearing and deformation twinning. Increasing of Co content can decrease the stacking fault energy (SFE) and facilitate the initiation of twinning, therefore, deformation mechanisms between the 5Co alloy and 23Co alloy made by AM are of notable difference.

引用

页数：10

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