Residual Stress in Selective Laser Melted Inconel 718
- The residual stress distribution in IN718 elongated prisms produced by selective laser melting was studied by means of neutron (bulk) and laboratory X-ray (surface) diffraction. Two deposition hatch lengths were considered. A horizontal plane near the top surface (perpendicular to the building direction) and a vertical plane near the lateral surface (parallel to the building direction) were investigated. Samples both in as-built (AB) condition and removed from the base plate (RE) were characterized. While surface stress fields seem constant for the AB condition, X-ray diffraction shows stress gradients along the hatch direction in the RE condition. The stress profiles correlate with the distortion maps obtained by tactile probe measurements. Neutron diffraction shows bulk stress gradients for all principal components along the main sample directions. We correlate the observed stress patterns with the hatch length, i.e., with its effect on temperature gradients and heat flow. The bulk stress gradients partially disappear after removalThe residual stress distribution in IN718 elongated prisms produced by selective laser melting was studied by means of neutron (bulk) and laboratory X-ray (surface) diffraction. Two deposition hatch lengths were considered. A horizontal plane near the top surface (perpendicular to the building direction) and a vertical plane near the lateral surface (parallel to the building direction) were investigated. Samples both in as-built (AB) condition and removed from the base plate (RE) were characterized. While surface stress fields seem constant for the AB condition, X-ray diffraction shows stress gradients along the hatch direction in the RE condition. The stress profiles correlate with the distortion maps obtained by tactile probe measurements. Neutron diffraction shows bulk stress gradients for all principal components along the main sample directions. We correlate the observed stress patterns with the hatch length, i.e., with its effect on temperature gradients and heat flow. The bulk stress gradients partially disappear after removal from the base plate.…
| Author details: | Tobias ThiedeORCiDGND, Sandra Cabeza, Tatiana MishurovaORCiDGND, Naresh Nadammal, Arne Kromm, Johannes Bode, Christoph Haberland, Giovanni BrunoORCiDGND |
|---|---|
| DOI: | https://doi.org/10.1520/MPC20170119 |
| ISSN: | 2379-1365 |
| ISSN: | 2165-3992 |
| Title of parent work (English): | Materials performance and characterization |
| Subtitle (German): | Influence of the Removal from Base Plate and Deposition Hatch Length |
| Publisher: | American Society for Testing and Materials |
| Place of publishing: | West Conshohocken |
| Publication type: | Article |
| Language: | English |
| Date of first publication: | 2018/05/10 |
| Publication year: | 2018 |
| Release date: | 2022/03/10 |
| Tag: | IN718; additive manufacturing; coordinate measurement machine; laboratory x-ray diffraction; neutron diffraction; residual stress; selective laser melting |
| Volume: | 7 |
| Issue: | 4 |
| Number of pages: | 19 |
| First page: | 717 |
| Last Page: | 735 |
| Funding institution: | BAM program MI-Typ3 |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
