About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
Crack Mitigation Strategies In Laser Powder Bed Fusion of Pure Tungsten |
Author(s) |
Philip Depond, Maria Stranza, Shiqi Zheng, Alberico Talignani, Morris Wang, Jianchao Ye |
On-Site Speaker (Planned) |
Philip Depond |
Abstract Scope |
Laser Powder Bed Fusion (LPBF) of refractory materials pose a unique challenge for the manufacturing of defect free structures. The high thermal diffusivity of tungsten, along with its high melting temperature and high ductile-to-brittle transition temperature (DBTT) has made it difficult to find a processing window for defect free structures. A fundamental understanding of crack formation and mitigation strategies is an active area of research. Here we present efforts to reach high density, >95%, and low crack density tungsten using LPBF. We use a custom built LPBF system with a high temperature heating stage to investigate the effects of up to 1000C pre-heating on the processing of pure Tungsten. Various scan strategies are compared, and thermo-mechanical modeling gives insights into the evolution of temperature and strength during printing. Mechanical properties and the resulting microstructure of as-built parts are reported. |