| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture IV: Toward Confident Use in Critical Applications
|
| Presentation Title |
A-9: Microstructure, High-temperature Tensile and Fatigue Properties of IN625 Manufactured by Selective Laser Melting |
| Author(s) |
Tae-Hoon Kang, Kyu-Sik Kim, Michael E. Kassner, Kwang-Tae Son, Kee-Ahn Lee |
| On-Site Speaker (Planned) |
Tae-Hoon Kang |
| Abstract Scope |
Microstructure, high-temperature tensile and fatigue properties of additively manufactured IN625 were investigated and compared with (conventional) wrought IN625. To obtain lower defect and uniform microstructure of selective laser melted IN625, the hot-isostatic-pressing (HIP) process was carried out at 1175℃ and 150MPa for 3 hours under Ar gas environment. Initial microstructural characteristics were analyzed by SEM, XRD, EBSD, and TEM. As a result, the SLM IN625 alloy showed to contain nano-sized precipitates (Ni3Nb, TiN). Mechanical properties were evaluated at both room temperature and 650℃. Yield strength difference between SLM IN625 (246.2MPa) and wrought IN625 (242.6MPa) was similar at 650℃. But SLM IN625 showed lower ductility (38.7%) than wrought IN625 (73%). High-temperature fatigue tests were conducted at 650℃. Fatigue limits of both alloys were higher (500MPa for SLM and 550MPa for wrought) than those yield strengths at 650℃. Based on these findings, correlations between microstructure, high-temperature deformation and fatigue mechanisms were discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |