Microstructure and Mechanical Properties of Friction Stir Welded Inconel 718 Alloy

2010 ◽  
pp. 391-396
Author(s):  
K.H. Song ◽  
K. Nakata
Keyword(s):  
Mechanical Properties ◽  
Inconel 718 ◽  
Inconel 718 Alloy ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties

Precipitates formation and its impact in friction stir welded and post-heat-treated Inconel 718 alloy

2011 ◽  
Vol 1363 ◽  
Author(s):  
Kuk Hyun Song ◽  
Han Sol Kim ◽  
Won Yong Kim
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Inconel 718 ◽  
Rotation Speed ◽  
Base Material ◽  
Post Heat Treatment ◽  
Inconel 718 Alloy ◽  
Friction Stir ◽  
Heat Treated

ABSTRACTIn order to investigate the formation of precipitates such as MC carbides and intermetallic compounds in the friction stir welded and post-heat-treated Inconel 718 alloy, this work was carried out. Furthermore, the microstructural and mechanical properties of welds and post-heat-treated material were evaluated to identify the effect on precipitates formed during post-heat-treatment. Friction stir welding (FSW) was performed at a rotation speed of 200 rpm and welding speed of 150 mm/min; heat treatment was performed after welding at 720 °C for 8 hours in vacuum. As a result, the grain size due to FSW was notably refined from 5–20 μm in the base material to 1–3 μm in the stir zone; this was accompanied by dynamic recrystallization, which resulted in enhancements in the mechanical properties as compared to the base material. In particular, applying heat treatment after FSW led to improvements in the mechanical properties of the welds—the microhardness and tensile strength increased by more than 50% and 40% in fraction, respectively, as compared to FSW alone.

scholarly journals Study of Microstructure and Mechanical Properties of As-built and Heat-treated Additive Manufactured Inconel 718 Alloy

2021 ◽  
Vol 38 (3) ◽  
Author(s):  
Ajay Kumar Maurya ◽  
Amit Kumar
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Inconel 718 ◽  
Failure Modes ◽  
Grain Structure ◽  
Inconel 718 Alloy ◽  
Laves Phases ◽  
Design Data ◽  
Microstructure And Mechanical Properties ◽  
Heat Treated

Additive manufacturing technology is becoming popular in the industry because it allows the manufacturer to fabricate cost-effective, strong, lightweight, and complex-shaped parts directly from 3D design data as compared with the conventional manufacturing method. Inconel 718 alloy is the most demanding material in aviation as well as in the automobile industry, in terms of manufacturing high-performance parts. In this study, Inconel 718 samples were built using the direct metal laser sintering process, and standard heat treatment was performed on the samples to improve their microstructure and mechanical properties. The as-built samples exhibited good grain structure with fine laves phases, but the matrix was free from ?' and ?" phases. During the heat treatment, the strengthening phases ?' and ?" precipitated. The mechanical properties of as-built and heat-treated samples were analysed and compared. Tensile tests revealed that the direct-aged sample had the higher tensile strength compared with the other conditions, whereas the as-built samples had higher ductility. Finally, fractography and microstructure analysis were performed to measure the failure modes of tensile specimens.

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