About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Enhancement and Synergy with Traditional Methods
|
| Presentation Title |
Mechanical Properties of Dissimilar Welds Between LPBFed and Wrought 17-4PH Stainless Steels: Role of LPBFed 17-4PH STS Precipitation Characteristics |
| Author(s) |
Ha Yeon Joo, Ji Won Lee, Yong Hyeok Choi, Hyun Uk Hong |
| On-Site Speaker (Planned) |
Ha Yeon Joo |
| Abstract Scope |
17-4PH stainless steel is widely used in aerospace and defense industries due to its high strength, weldability, and corrosion resistance. As the demand for complex-shaped components increases, AM processes like L-PBF are increasingly adopted, though size limitations often require welding with wrought materials. This study examines the microstructural and mechanical characteristics of dissimilar welds between L-PBFed and wrought 17-4PH stainless steels produced by GTAW. Both base metals showed martensitic structures. SEM analysis, Vickers hardness testing, and tensile tests were conducted. Hardness profiles revealed distinct precipitation behaviors in the heat-affected zones of AM and wrought materials. Tensile fractures occurred in the low-hardness region due to strain incompatibility caused by hardness gradients. A post-weld heat treatment was proposed and optimized to control precipitation behavior and reduce strain mismatch. After heat treatment, the mechanical performance of dissimilar welds approached that of wrought-wrought welds, demonstrating the effectiveness of the proposed method. |