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electroformed nickel
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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.c9001852
EISBN: 978-1-62708-241-9
... Abstract A 2–3 mm thick electroformed nickel mold showed early cracking under thermal load cycles. To determine the root cause, investigators obtained monotonic and cyclic properties of electroformed nickel at various temperatures and identified possible fatigue mechanisms. With the help...
Abstract
A 2–3 mm thick electroformed nickel mold showed early cracking under thermal load cycles. To determine the root cause, investigators obtained monotonic and cyclic properties of electroformed nickel at various temperatures and identified possible fatigue mechanisms. With the help of finite element modeling, they analyzed the material as well as the design and in-service application of the mold. They discovered that overconstraining the mold, while it was in service, caused excessive thermal stresses which accelerated crack initiation and propagation. Investigators also proposed remedies to prevent additional failures.
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Published: 01 December 2019
Fig. 1 EDX analysis of the elements of the electroformed nickel (results of spectrums analyses are tabulated in Table 1 )
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Published: 01 December 2019
Fig. 2 Second phase particles in electroformed nickel, all elements analyzed (results of spectrums analyses are given in Table 2 )
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Published: 01 December 2019
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Published: 01 December 2019
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Published: 01 December 2019
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Published: 01 December 2019
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001031
EISBN: 978-1-62708-214-3
... are machined into the liner and filled with wax. An electroforming process is then used to apply structural nickel to the exterior of the liner. The SSME is designed to operate in a reducing fuel-rich environment, as a hyperstoichiometric mixture of hydrogen to oxygen is injected into the MCC. Circumstances...
Abstract
Pinhole defects were found in a main combustion chamber made from NARloy-Z after an unexpectedly short time in service. Analysis indicated that the throat section of the liner had been exposed to very severe environmental conditions of high temperature and high oxygen content, which caused ductility loss and grain-boundary separation. The excessive oxygen content in the liner was attributed to diffusion from an oxygen-rich environment that had resulted from nonuniform mixing of propellants. The internal oxygen embrittled the alloy and reduced its thermal conductivity, which resulted in a higher hot-gas wall temperature and associated degradation of mechanical properties.