J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (6): 1153-1164.DOI: 10.1016/j.jmst.2018.12.006
Previous Articles Next Articles
Le Zhouab*(), Abhishek Mehtab, Brandon McWilliamsc, Kyu Choc, Yongho Sohnab
Received:
2018-09-27
Revised:
2018-10-23
Accepted:
2018-11-05
Online:
2019-06-20
Published:
2019-06-19
Contact:
Zhou Le
About author:
1 These authors contributed equally to this work.
Le Zhou, Abhishek Mehta, Brandon McWilliams, Kyu Cho, Yongho Sohn. Microstructure, precipitates and mechanical properties of powder bed fused inconel 718 before and after heat treatment[J]. J. Mater. Sci. Technol., 2019, 35(6): 1153-1164.
Ni | Cr | Co | Mo | Al | Fe | Ti | Nb | C | B | Cu | Mn | P | S | Si |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
50.0-55.0 | 17.0-21.0 | 1.0 | 2.80-3.30 | 0.20-0.80 | Bal. | 0.65-1.15 | 4.75-5.50 | 0.08 | 0.006 | 0.30 | 0.35 | 0.0015 | 0.0015 | 0.35 |
Table 1 Chemical composition in weight percent of the IN718 powders.
Ni | Cr | Co | Mo | Al | Fe | Ti | Nb | C | B | Cu | Mn | P | S | Si |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
50.0-55.0 | 17.0-21.0 | 1.0 | 2.80-3.30 | 0.20-0.80 | Bal. | 0.65-1.15 | 4.75-5.50 | 0.08 | 0.006 | 0.30 | 0.35 | 0.0015 | 0.0015 | 0.35 |
Designation | Solution Heat Treatment | Aging |
---|---|---|
As-built | None | None |
DA | None | 720 °C for 8 h + 620 °C for 8 h |
S980 | 980 °C for 1 h | None |
SA980 | 980 °C for 1 h | 720 °C for 8 h + 620 °C for 8 h |
S1065 | 1065 °C for 1 h | None |
SA1065 | 1065 °C for 1 h | 720 °C for 8 h + 620 °C for 8 h |
Table 2 Heat treatment parameters for different PBF IN718 alloy samples examined in this study.
Designation | Solution Heat Treatment | Aging |
---|---|---|
As-built | None | None |
DA | None | 720 °C for 8 h + 620 °C for 8 h |
S980 | 980 °C for 1 h | None |
SA980 | 980 °C for 1 h | 720 °C for 8 h + 620 °C for 8 h |
S1065 | 1065 °C for 1 h | None |
SA1065 | 1065 °C for 1 h | 720 °C for 8 h + 620 °C for 8 h |
Fig. 1. X-ray diffraction patterns from the XY cross-sections of PBF IN718 alloy samples: (a) as-built, (b) DA, (c) S980, (d) SA980, (e) S1065 and (f) SA1065.
Fig. 4. Electron backscatter diffraction (EBSD) grain mapping illustrating the grain structure of the as-built IN718 alloy in the (a) XY and (b) XZ cross-sections, and (c) the corresponding distribution of grain size.
Fig. 5. TEM observations from the as-built IN718 alloy sample: (a) BF TEM micrograph of cellular structure; (b) SADP within the cell without any precipitates; (c) SADP from the cellular boundary with Laves phase; (d) HAADF STEM micrograph and (e) XEDS elemental mapping of Al, Ti, Cr, Fe, Ni, Nb, Mo, C and O from the white square marked in (d).
Fig. 7. TEM observations from the DA IN718 alloy sample: (a, b) HAADF STEM micrographs and (c) XEDS elemental mapping for Al, Ti, Cr, Fe, Ni, Nb, Mo, and C from the white square marked in (b).
Fig. 9. TEM observations from the SA980 IN718 alloy sample: (a) HAADF STEM micrograph; (b) BF TEM micrograph and (c) SADP of the δ-phase; (d) HAADF STEM micrograph; (e) XEDS elemental mapping of Al, Ti, Cr, Fe, Ni, Nb, Mo, C and O from the white square marked in (d); and (f) SADP of the γ” needle.
Fig. 11. TEM observations from the SA1065 IN718 alloy sample: (a) HAADF STEM micrograph; (b) SADP of the carbide particle; (c) HAADF STEM micrograph and (d) XEDS elemental mapping of Al, Ti, Cr, Fe, Ni, Nb, Mo, B/C and O from the white square marked in (d).
Fig. 12. (a) A SADP from the γ <001> orientation and its schematic representation; (b) DF TEM micrograph of γ' and γ” precipitates; High resolution TEM micrograph of γ” from the (c) [100] and [010] orientation and the (d) [001] orientation.
Fig. 13. DF TEM micrographs showing the γ’’ distribution and the corresponding SADP in the (a, b) DA, (c, d) SA980 and (e, f) SA1065 IN718 alloy samples.
E (GPa) | H (GPa) | Vickers | |
---|---|---|---|
As-built | 208 (7.7) | 4.9 (0.13) | 296 (2.9) |
DA | 226 (8.6) | 6.8 (0.19) | 467 (4.3) |
S980 | 193 (7.7) | 4.6 (0.14) | 267 (2.1) |
SA980 | 209 (6.0) | 6.6 (0.18) | 458 (4.2) |
S1065 | 181 (9.0) | 4.4 (0.16) | 235 (4.2) |
SA1065 | 226 (6.3) | 7.0 (0.14) | 477 (6.6) |
Table 3 Young’s modulus and nano-scale hardness measured from instrumented nanoindentation, and Vickers hardness for PBF IN718 alloy samples examined in this study. The standard deviations were listed in the parentheses.
E (GPa) | H (GPa) | Vickers | |
---|---|---|---|
As-built | 208 (7.7) | 4.9 (0.13) | 296 (2.9) |
DA | 226 (8.6) | 6.8 (0.19) | 467 (4.3) |
S980 | 193 (7.7) | 4.6 (0.14) | 267 (2.1) |
SA980 | 209 (6.0) | 6.6 (0.18) | 458 (4.2) |
S1065 | 181 (9.0) | 4.4 (0.16) | 235 (4.2) |
SA1065 | 226 (6.3) | 7.0 (0.14) | 477 (6.6) |
|
[1] | Hui Jiang, Dongxu Qiao, Wenna Jiao, Kaiming Han, Yiping Lu, Peter K. Liaw. Tensile deformation behavior and mechanical properties of a bulk cast Al0.9CoFeNi2 eutectic high-entropy alloy [J]. J. Mater. Sci. Technol., 2021, 61(0): 119-124. |
[2] | Jincheng Wang, Yujing Liu, Chirag Dhirajlal Rabadia, Shun-Xing Liang, Timothy Barry Sercombe, Lai-Chang Zhang. Microstructural homogeneity and mechanical behavior of a selective laser melted Ti-35Nb alloy produced from an elemental powder mixture [J]. J. Mater. Sci. Technol., 2021, 61(0): 221-233. |
[3] | Qin Xu, Dezhi Chen, Chongyang Tan, Xiaoqin Bi, Qi Wang, Hongzhi Cui, Shuyan Zhang, Ruirun Chen. NbMoTiVSix refractory high entropy alloys strengthened by forming BCC phase and silicide eutectic structure [J]. J. Mater. Sci. Technol., 2021, 60(0): 1-7. |
[4] | K.J. Tan, X.G. Wang, J.J. Liang, J. Meng, Y.Z. Zhou, X.F. Sun. Effects of rejuvenation heat treatment on microstructure and creep property of a Ni-based single crystal superalloy [J]. J. Mater. Sci. Technol., 2021, 60(0): 206-215. |
[5] | Hui Xiao, Manping Cheng, Lijun Song. Direct fabrication of single-crystal-like structure using quasi-continuous-wave laser additive manufacturing [J]. J. Mater. Sci. Technol., 2021, 60(0): 216-221. |
[6] | Xing Zhou, Jingrui Deng, Changqing Fang, Wanqing Lei, Yonghua Song, Zisen Zhang, Zhigang Huang, Yan Li. Additive manufacturing of CNTs/PLA composites and the correlation between microstructure and functional properties [J]. J. Mater. Sci. Technol., 2021, 60(0): 27-34. |
[7] | Zijuan Xu, Zhongtao Li, Yang Tong, Weidong Zhang, Zhenggang Wu. Microstructural and mechanical behavior of a CoCrFeNiCu4 non-equiatomic high entropy alloy [J]. J. Mater. Sci. Technol., 2021, 60(0): 35-43. |
[8] | B.N. Du, Z.Y. Hu, L.Y. Sheng, D.K. Xu, Y.X. Qiao, B.J. Wang, J. Wang, Y.F. Zheng, T.F. Xi. Microstructural characteristics and mechanical properties of the hot extruded Mg-Zn-Y-Nd alloys [J]. J. Mater. Sci. Technol., 2021, 60(0): 44-55. |
[9] | Xiong-jie Gu, Wei-li Cheng, Shi-ming Cheng, Yan-hui Liu, Zhi-feng Wang, Hui Yu, Ze-qin Cui, Li-fei Wang, Hong-xia Wang. Tailoring the microstructure and improving the discharge properties of dilute Mg-Sn-Mn-Ca alloy as anode for Mg-air battery through homogenization prior to extrusion [J]. J. Mater. Sci. Technol., 2021, 60(0): 77-89. |
[10] | Lin Yuan, Jiangtao Xiong, Yajie Du, Jin Ren, Junmiao Shi, Jinglong Li. Microstructure and mechanical properties in the TLP joint of FeCoNiTiAl and Inconel 718 alloys using BNi2 filler [J]. J. Mater. Sci. Technol., 2021, 61(0): 176-185. |
[11] | Yanxin Qiao, Daokui Xu, Shuo Wang, Yingjie Ma, Jian Chen, Yuxin Wang, Huiling Zhou. Effect of hydrogen charging on microstructural evolution and corrosion behavior of Ti-4Al-2V-1Mo-1Fe alloy [J]. J. Mater. Sci. Technol., 2021, 60(0): 168-176. |
[12] | Yunsheng Wu, Xuezhi Qin, Changshuai Wang, Lanzhang Zhou. Microstructural evolution and its influence on the impact toughness of GH984G alloy during long-term thermal exposure [J]. J. Mater. Sci. Technol., 2021, 60(0): 61-69. |
[13] | Jixin Yang, Yiqiang Chen, Yongjiang Huang, Zhiliang Ning, Baokun Liu, Chao Guo, Jianfei Sun. Hierarchical microstructure of a titanium alloy fabricated by electron beam selective melting [J]. J. Mater. Sci. Technol., 2020, 42(0): 1-9. |
[14] | Kaio Niitsu Campo, Caio Chaussê de Freitas, Leonardo Fanton, Rubens Caram. Melting behavior and globular microstructure formation in semi-solid CoCrCuxFeNi high-entropy alloys [J]. J. Mater. Sci. Technol., 2020, 52(0): 207-217. |
[15] | Jinxiong Hou, Wenwen Song, Liwei Lan, Junwei Qiao. Surface modification of plasma nitriding on AlxCoCrFeNi high-entropy alloys [J]. J. Mater. Sci. Technol., 2020, 48(0): 140-145. |
Viewed | ||||||
Full text |
|
|||||
Abstract |
|
|||||