期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 911, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.164988
关键词
Inconel 718 alloy; Selective laser melting; Solution and double aging treatments; Mechanical properties
资金
- National Defense Foundation of China [61400040208]
- China Postdoctoral Science Foundation [2019M661068]
- Key Research and Development Project of Shanxi Province [201903D121009]
- Scientific andTechnological Innovation Projects of Shanxi Province, China [2019L0608]
- Major Science and Technology Projects of Shanxi Province, China [20181101009]
In this study, IN718 alloy was manufactured using selective laser melting, and the effects of solution and double aging treatments on its microstructure and mechanical properties were investigated. The results showed that increasing the solution temperature promoted grain recrystallization and the formation of a nanoscale granular composite phase, resulting in enhanced strength.
In this study, Inconel 718 (IN718) alloy was manufactured by selective laser melting (SLM), and the effects of solution and double aging treatments (SDA) on the microstructure and mechanical properties of the IN718 alloy were investigated. Results revealed that the increase of the solution temperature promotes the increase of the number of recrystallized grains of the IN718 alloy. When the solution temperature is 940 degrees C, a large amount of needle-like gamma '' are formed. With the increase of the solution temperature (980 degrees C-1140 degrees C), the needle-like gamma '' phase in the alloy begins to decrease and gradually disappear, accompanying the precipitation of the nanoscale granular gamma'/gamma composite phase. When the solution temperature is 1140 degrees C, an enhanced ultimate tensile strength (UTS) of 1451 MPa and a slight sacrifice of fracture elongation (23.7%) are achieved for the IN718 alloy. The formed nanoscale granular gamma'/gamma composite phase and annealing twins were responsible for the enhanced mechanical properties of the IN718 alloys.(c) 2022 Elsevier B.V. All rights reserved.
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