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ASTM A296 grade CA40 (martensitic stainless steel)
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ASTM A296 grade CA40 (martensitic stainless steel)
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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.c9001828
EISBN: 978-1-62708-241-9
.... Corrective actions to make the journals less susceptible to future failures were implemented and the process by which they were developed is described. pump bearing journal fracture vibration stainless steel ratchet marks striations scanning electron fractography hardness ASTM A296 grade CA40...
Abstract
A heat transport pump in a heavy water reactor failed (exhibiting excessive vibration) during a restart following a brief interruption in coolant flow due to a faulty valve. The pump had developed a large crack across the entire length of a bearing journal. An investigation to establish the root cause of the failure included chemical and metallurgical analysis, scanning electron fractography, mechanical property testing, finite element analysis of the shrink fitted journal, and a design review of the assembly fits. The journal failure was attributed to corrosion fatigue. Corrective actions to make the journals less susceptible to future failures were implemented and the process by which they were developed is described.