Additive Manufacturing of Cryogenic Pump Impellers
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Date
2022
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Turbomachinery Laboratory, Texas A&M Engineering Experiment Station
Abstract
Additive manufacturing has been utilized in an increasing number of applications for many different types of services. Cryogenic pump impellers can be manufactured to ASTM F3318 for AlSi10Mg in the HIP + T6 condition through Direct Metal Laser Sintering (DMLS) which achieves mechanical properties which are improved upon standard A356.0-T6 impellers. The tensile strength, yield strength and ductility of the material exceed that of the cast impeller. High cycle fatigue testing as shown that there are no reductions in the fatigue endurance limit, both at room temperature and at cryogenic temperatures. The dimensional tolerances of the as-printed surfaces can be maintained in comparison to cast impellers, and surface finish obtained on the as-printed surfaces can match the surface finish of traditional sand cast impellers. Non-destructive evaluation performed on the impeller through both surface inspection and volumetric inspection can meet or exceed the inspection requirements that are applied to cast impellers. Additive manufacturing of cryogenic pump impellers can be utilized to improve the lead time, making it ideal for service and replacement parts applications.
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