Fatigue crack growth in IN718/316L multi-materials layered structures fabricated by laser powder bed fusion

•Layered specimen of 316L and IN718 has been fabricated by multiple material additive manufacturing.•The crack propagation mechanism was investigated under three point bending, and recorded via direct current potential drop method, then analysed via correlation between the stress intensity factor an...

Full description

Saved in:
Bibliographic Details
Published in:International journal of fatigue 2021-11, Vol.152, p.106454, Article 106454
Main Authors: Duval-Chaneac, M.S., Gao, N., Khan, R.H.U., Giles, M., Georgilas, K., Zhao, X., Reed, P.A.S.
Format: Article
Language:English
Subjects:
Additive manufacturing (AM)
Crack growth rate
Crack propagation
Fatigue analysis
Fatigue failure
Fatigue tests
Fracture mechanics
Interface
Materials fatigue
Mechanical properties
Multi-materials
Multilayers
Nanohardness
Nickel base alloys
Optimization
Powder beds
Rapid prototyping
Superalloys
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Layered specimen of 316L and IN718 has been fabricated by multiple material additive manufacturing.•The crack propagation mechanism was investigated under three point bending, and recorded via direct current potential drop method, then analysed via correlation between the stress intensity factor and the final fracture surface.•Mechanisms of shielding and antishielding in the crack propagation were investigated through a 4 alternated layer specimen.•Relation between the as-built microstructure and the tensile properties of each alloy was used to put in perspective the results obtained in the different crack propagation tests. Multi-materials additive manufacturing (MMAM) allows the functional optimisation of components by tailoring the addition of alloys at different design locations in a single operation. In this study Laser Powder Bed Fusion (L-PBF) technique was used to manufacture layered specimens combining IN718 and 316L materials. The microstructure and mechanical properties were studied by scanning electron microscopy (SEM), tensile, micro and nanohardness testing. The fatigue tests were performed to determine the crack propagation process through multi-layer specimens in the as-built (AB) state.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2021.106454