About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
|
Presentation Title |
Fatigue Crack Growth and Fracture Toughness Behavior of Laser Powder Bed Fusion Titanium Alloys |
Author(s) |
Jamie J. Kruzic, Tarik Hasib, Xiaopeng Li |
On-Site Speaker (Planned) |
Jamie J. Kruzic |
Abstract Scope |
Laser powder bed fusion (LPBF) produces unique microstructures (e.g., columnar grains, texture, etc.) that influence mechanical properties. In this work, the crack growth properties of LPBF produced CP-Ti and Ti-6Al-4V were examined at room temperature with various cracking orientations relative to the build plane and various post heat treatments, including hot isostatic pressing (HIP). Both materials showed negligible anisotropy in their fatigue growth rates and thresholds, especially when compared to a commercially produced wrought CP-Ti plate that showed large anisotropy in its fatigue threshold. Generally, the fatigue thresholds were defined by the ability to transfer slip from one α'/α lath to another, with a minor role of roughness induced crack closure. Fracture toughness results for the LPBF produced CP-Ti showed increased anisotropy compared to the fatigue thresholds. Microstructure analysis, fractography, and crack profiles were used to further understand the microstructure influence on the fracture and fatigue crack growth properties. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Mechanical Properties, Titanium |