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ASM Failure Analysis Case Histories
ASM Failure Analysis Case Histories: Processing Errors and Defects
ASM International
ISBN electronic:
978-1-62708-235-8
Publication date:
2019
Book Chapter
Use of Electron Fractography to Diagnose Cracking in a 7075-T6 Aluminum Forging
By
James A. Scott
James A. Scott
Group Leader, Engineering, Metallurgical Engineering Requirements, Aircraft Div., McDonnell Douglas Corp.
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Published:2019
Abstract
A forging of 7075-T6 aluminum alloy, which formed a support for the cylinder of a cargo door, cracked at an attachment hole. Fluorescent penetrant inspection showed the crack ran above and below the hole out onto the machined flat surface of the flange. A 6500x electron fractograph proved the crack to be a forging defect called a cold shut. Because defects of this type are usually detected when the raw forging is inspected, this occurrence was considered to be an isolated instance.
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Citation
James A. Scott, Use of Electron Fractography to Diagnose Cracking in a 7075-T6 Aluminum Forging, ASM Failure Analysis Case Histories: Processing Errors and Defects, ASM International, 2019, https://doi.org/10.31399/asm.fach.process.c9001541
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