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Robards, KY, United States

Miller B.A.,IMR Metallurgical Services | Springer S.P.,DuPont Company
Materials Performance | Year: 2011

Two failed precipitation-hardened stainless steel (SS) suction poppets from a high-pressure pump were submitted for metallurgical failure analysis. This equipment reportedly carried a proprietary mixture of organic acids, mineral acid, and organics, with the balance being water. The two pump poppets were initially examined to identify the macroscopic fracture features. Both poppets exhibited similar failure features, which consisted of gross cracking and fracturing. The cracking was accompanied by irregular corrosion damage, without gross corrosion product being formed. Deep, linear corrosion pits were apparent in some regions, but most other regions contained no pitting. Many of the larger fracture surfaces revealed features that were characteristic of progressive fracture. The angled fractures from the interior flat surface exhibited ratchet markings, which are indicative of numerous independent cracks that coalesced into a uniform crack front.

Miller B.A.,IMR Metallurgical Services | Ackerson T.N.,IMR Metallurgical Services | Zellers IV J.T.,IMR Metallurgical Services | Breetz J.,IMR Metallurgical Services
Journal of Failure Analysis and Prevention | Year: 2013

Inadvertent diffusion bonding of workpieces during heat treatment, although relatively well understood, remains a troublesome phenomenon. Metallurgical failure analysts are often called upon to investigate material damages due to heat-treatment damage, including unintentional bonding. Failure analysis investigations of diffusion bonding, which were originally misdiagnosed as being due to other phenomena, are presented in this paper for illustration. © 2012 ASM International.

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