Residual Stress Development in Additively Manufactured Compositionally Graded Superalloy
March 15, 2023
Top: the neutron imaging revealed the chemical composition gradient of the as-built and high temperature treated graded structure. Bottom: the residual stress in an as-built sample was resolved with rapid neutron diffraction mapping.
Scientific Achievement
It is shown that the residual stress in additively-manufactured graded superalloy primarily depends on geometry and deposition process and not on composition.
Significance and Impact
The understanding of the residual stress distribution provides input for future simulation and optimization of the additive manufacturing process and material properties, incorporating the influence of thermal history.
Research Details
- A graded superalloy with transition from IN718 to René41 was fabricated by laser blown-powder directed energy deposition.
- Neutron imaging qualitatively visualized the composition variations.
- Residual stress in the built wall was measured by neutron diffraction by computationally resolving the impact of the chemical gradient on the stress-free reference state.
“Residual stress and microstructure in IN718-René41 graded superalloy fabricated by laser blown directed energy deposition,”
Shenyang Huang*, Chen Shen, Ke An, Yuxuan Zhang, Ian Spinelli, Marissa Brennan and Dunji Yu,
Frontiers in Metals and Alloys, 1:1070562, (2022). DOI: https://doi.org/10.3389/ftmal.2022.1070562
