Fracture characterisation of vertically build functionally graded 316L stainless steel with Inconel 718 deposited by directed energy deposition process

• DOI: 10.1080/17452759.2022.2073793
• Publication Date: 2022-05-12T18:36:06Z
• Authors: Daniel Melzer; Ján Džugan; Martina Koukolíková; Sylwia Rzepa; Jaromír Dlouhý; Michal Brázda; Tomasz Bucki
• Keywords: Inconel; Deposition; Functionally graded material; Tensile testing

Functionally graded materials (FGM) are a very promising group of technical materials. The potential FGM was increased recently by Additive manufacturing (AM) techniques. This is due to the possibility automatisation entire process and achievable variable material structure controlled deposition parameters. defects unexpected formation crucial for performance additively manufactured components. Conventional compositionally multi-material systems characterised horizontally oriented interfaces located within XY plane system. paper deals with fabrication based on 316L IN718 in combination vertically between single zones. Critical were observed microstructure as result solidification cracking. Mini tensile test results showed that 316L/IN718 interface ZYX (vertical) orientation weakest points produced material. Fractographic analysis revealed all specimens YZX testing direction exhibit cracking propagated along grain boundaries detrimental effect strength interface. Results current study confronted previous obtained deposited