A Critical Review of the Material Characteristics of Additive Manufactured IN718 for High Temperature Application

Abstract

This paper reviews state of the art Additive Manufactured (AM) IN718 alloy intended for high temperature applications. AM processes have been around for decades and have gained traction in the past five years due to the huge economic benefit it brings to manufacturers. It is crucial for the scientific community to look into AM IN718 applicability in order to see a step-change in the production. Microstructural studies reveal that the grain structure plays a significant role in determining the fatigue lifespan of the material. Controlling IN718 respective phases such as the ϒ’', δ and Laves phase is seen to be crucial. Literature reviews have shown that the mechanical properties of AM IN718 were very close to its wrought counterpart when treated appropriately. Higher homogenization temperature and longer ageing were recommended to dissolve the damaging phases. Various surface enhancement techniques were examined to find out their compatibility to AM IN718 alloy that is intended for high temperature application. Laser shock peening (LSP) technology stands out due to the ability to impart low cold work which helps in containing the beneficial compressive residual stress it brings in high temperature fatigue environment.

Modification of Mechanical Properties in Directed Energy Deposition by a Static Magnetic Field: Experimental and Theoretical Analysis

“…Gamma phase is observed as the main phase in Figure 9 , which is also mentioned in [ 4 , 22 , 42 , 43 ]. The XRD analysis revealed no presence of Ni 3 (Al, Ti), Ni 3 Nb, and intermetallic Laves ((Ni, Cr, Fe) 2 (Nb, Mo, Ti)) phases [ 4 , 44 , 45 ]. As shown in Figure 9 , the intensity of the maximums varies, which can be explained by differences in texture.…”

Down to the Bone: A Novel Bio-Inspired Design Concept

“…In the recent years, there has been a significant advancement in this biomimetic field, especially thanks to the progress and versatility of additive manufacturing (AM) techniques, also known as 3D printing. AM in general consists of a vast group of promising technologies that are based on the deposition of successive thin layers of material upon each other for fabricating complex geometries; it offers the unprecedented possibility of realizing a wide range of personalized structures, starting from models obtained from computer-aided design (CAD) programs [ 9 ]. This progress has paved the way for exploiting intricate biomimetic designs to offer customized solutions in the fields of product design, architecture and garments with remarkable benefits both in terms of structural strength and aesthetics [ 10 ].…”

Farklı bağıl yoğunluklardaki Inconel 718 ve Ti6Al4V biyomedikal parçaların seçici lazer ergitme (SLE) metoduyla üretiminin simülasyonu

“…Ancak bu yöntemler, yüksek miktarda malzeme atığına, yüksek üretim maliyetine ve uzun imalat sürecine neden olabilmektedir [22]. Yukarıda bahsedilen üretim zorluklarından dolayı, yapılan tasarımlar doğrultusunda karmaşık geometrilere sahip Inconel 718 ve Ti6Al4V malzemeden ürünler, yenilikçi bir imalat yöntemi olan Eİ yöntemi ile son boyutlarına yakın ve verimli bir şekilde üretilmektedir [23][24][25].…”