About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
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Presentation Title |
The Effect of Hydrogen on the Growth of Sub-micron Scale Porosity in Additively Manufactured 17-4PH during Environmentally Assisted Cracking |
Author(s) |
James Burns, Trevor Shoemaker, Zzach Harris |
On-Site Speaker (Planned) |
James Burns |
Abstract Scope |
Sub-micron scale porosity occurs in laser powder bed fusion based 17-4PH alloy in the H900 and H1025 conditions. This sub-micron scale porosity was found to be responsible for an order of magnitude scale increase in the susceptibility of this allow to environmentally assisted cracking. Pore growth was observed proximate to the crack path. While a causal role of these pores on this enhanced susceptibility was established, the nature of the interaction between the pores and the crack tip stress field remains elusive. This work will evaluate the role of hydrogen on the pore growth in the near crack wake region. This behavior is evaluated by targeted testing for (1) fatigue in an inert dry N2 environment and (2) EAC cracking in a H-generating environment. The nature of the pore growth and local plasticity in the crack wake will be evaluated via high resolution SEM and EBSD of polished cross-sections. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Mechanical Properties, Environmental Effects |