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International Hydrogen Conference (IHC 2016): Materials Performance in Hydrogen Environments

Editor
B. P. Somerday
B. P. Somerday
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P. Sofronis
P. Sofronis
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ISBN:
9780791861387
No. of Pages:
800
Publisher:
ASME Press
Publication date:
2017

Laser-based powder bed additive manufacturing was used to fabricate mechanical test specimens using Type 304L stainless steel using identical processing parameters. Three-point bend specimens were built vertically using a common scan strategy at plate locations with different surrounding heat sink conditions. Fracture toughness properties of as-built and hydrogen-precharged specimens were measured as a function of build location. The purpose was to develop an understanding of the effects of additive manufacturing (AM) build parameters and table conditions on fracture toughness and hydrogen compatibility. The results show that the fracture toughness properties of the as-built steels fell into two ranges: higher toughness and lower toughness. As-built toughness was lower than forged toughness. Fracture toughness values appeared to depend on the configuration of the heat sinks surrounding the specimen being built but no clear trend emerged from the data. Hydrogen precharging lowered the fracture toughness properties and changed the fracture mode.

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