Journal
MICROSCOPY AND MICROANALYSIS
Volume 27, Issue 2, Pages 250-256Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927621000052
Keywords
additive manufacturing; heat treatment; in situ transmission electron microscopy; IN718; nanoscale mechanics
Categories
Funding
- Office of Naval Research [N00014-17-1-2559]
- U.S. Army Research Laboratory [W911NF1720172]
Ask authors/readers for more resources
This in situ transmission electron microscopy study examines the microstructural evolution of 3D-printed Inconel 718 under elevated temperatures and its effect on mechanical properties. The findings suggest that exposing as-printed IN718 to high temperatures without full heat treatment results in loss of ductility.
This in situ transmission electron microscopy work presents a nanoscale characterization of the microstructural evolution in 3D-printed Inconel 718 (IN718) while exposed to elevated temperature and an associated change in the mechanical property under tensile loading. Here, we utilized a specially designed specimen shape that enables tensile testing of nano-sized thin films without off-plane deformations. Additionally, it allows a seamless transition from the in situ heating to tensile experiment using the same specimen, which enables a direct correlation of the microstructure and the mechanical property of the sample. The method was successfully used to observe the residual stress relaxation and the formation of incoherent gamma' precipitates when temperature was increased to 700 degrees C. The subsequent in situ tensile test revealed that the exposure of the as-printed IN718 to a high temperature without full heat treatment (solutionizing and double aging) leads to loss of ductility.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available