Abstract
In this research work, Inconel 718 specimens are fabricated by Direct Metal Laser Sintering process in the closed chamber which is filled with argon gas environment from a pre-alloyed powder. The process contains the high intensity of the laser source to melt the powder material, and the segment is placed on the top of the previous layer. Plates were vertically fabricated systematically (i.e., z-axis) and columnar grains are exhibited perpendicular to the build direction (i.e., x-axis). Test specimens are stress-relieved at 980°C for 2 hours and the recrystallized zone are found to be spheroid structure precipitates. The Ni-Cr matrix in the recrystallized interface and grain boundaries is observed in the samples, the micro hardness of the as-fabricated material is found as 340-350 VHN. Also, correspondingly mechanical properties are comparable with the wrought inco-718 alloy material. Further, the as build condition specimens are used for making butt joint configuration using Tungsten Inert Gas (TIG) welding process and Mechanical and microstructural properties are studied. The studies on welding of additive manufactured component will ensure the weldability of the AM material for the research community and industry.
Highlights
Technology is increasing in modern days rapidly
Inconel 718 is chosen as the candidate material powder for this research work. 3D printing or Additive manufacturing is a methodology that uses three dimensional computer aided design (CAD) datasets to produce parts which are built layer upon layer with laser melting at power bed[9,10]
The influence of the microsructure is investigated by light microscopy with the magnification of 50X, for higher magnifications the scanning electron microscopy (SEM) equiped with Electro Back Scattered Diffraction (EBSD) detector is used for characterization of the microstructure
Summary
Technology is increasing in modern days rapidly. The researchers, scientists, and academians are working for the innovation of the world. The researchers have found that the usage of the Ni-based alloys has been increased drastically over the past few decades It exhibits excellent mechanical behaviour and lightweight in nature. An effort has been taken to study the mechanical and microstructural behaviour of Inco-718 that are fabricated by using a technique called Direct Metal Laser sintering (DMLS). This process makes the utilization of inert gas (argon gas). The mechanical and microstructural behaviour of the Inco-718 is carried out by conducting optical Metallography and X-ray diffraction analysis[8] The mechanical properties such as hardness and tensile strength are measured for fabricated and heat‐treated components. The Inco-718 aero engine components such as stator, rotor blades, atomizers, swirler which are produced through additive manufacturing by this research work are used in aerospace applications
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