About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing Fatigue and Fracture: Effects of Surface Roughness, Residual Stress, and Environment
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Presentation Title |
Mechanical Properties of Binder Jet Printed 17 – 4 Precipitation Hardened Martensitic Stainless Steel |
Author(s) |
Jayaraj Radhakrishnan, Punit Kumar, Alexis Bryl, Jim Mckinnell, Upadrasta Ramamurty |
On-Site Speaker (Planned) |
Upadrasta Ramamurty |
Abstract Scope |
The microstructure and mechanical properties of 17-4PH martensitic stainless steel fabricated using binder jet printing (BJP) were investigated with emphasis on high cycle fatigue (HCF) resistance. Porosity was varied by either controlling process parameters or by hot isostatic pressing. The tensile strength and ductility rise asymptotically with the decrease in porosity, until a critical fraction is reached. While the high cycle fatigue behavior was enhanced by the reduction in porosity, HIP results in a fatigue strength that is similar to CM alloy. Over-aging of the alloy improves its fatigue resistance due to higher stress intensity threshold for crack initiation. These variations are rationalized by recourse to analysis of the microstructure-crack interactions and was found that crack closure mechanisms are dominant at the fatigue crack tip of the over-aged microstructure. Significance of size rather than overall fraction of pore on the fatigue resistance of BJP 17-4PH alloys is highlighted. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Iron and Steel, Mechanical Properties |