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ASTM B148 (nickel-aluminum bronze)
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ASTM B148 (nickel-aluminum bronze)
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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001809
EISBN: 978-1-62708-241-9
... erosion damage inductively coupled plasma spectroscopy corrosion resistance ASTM B148 (nickel-aluminum bronze) UNS C95800 Background An impeller from a brackish water pump was removed from service after 4 years of use. The pump was a replacement for the original pump that lasted over 40 years...
Abstract
A brackish water pump impeller was replaced after four years of service, while its predecessor lasted over 40 years. The subsequent failure investigation determined that the nickel-aluminum bronze impeller was not properly heat treated, which made the impeller susceptible to aluminum dealloying. The dealloying corrosion was exacerbated by erosion because the pump was slightly oversized. The investigation recommended better heat treating procedures and closer evaluation to ensure that new pumps are properly sized.