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Book Chapter
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0059924
EISBN: 978-1-62708-235-8
Abstract
The large steel ring produced for a nuclear application from a billet of 8822 steel was inspected. The large billet was first forged into a doughnut preform in a large press, and then formed into the ring by ring rolling. A straight-beam ultrasonic inspection was instituted and calibrated using the back-surface-reflection method to determine whether adequate ultrasonic penetration was available. Areas of indications were noted at approximately midheight and adjacent to the bore area. An axial angle-beam inspection from the outside was performed, mainly in the area of indications to reveal detectable indications. The indications were not considered serious enough to reject the forgings. A few small indications in the areas tested were revealed by magnetic particle inspection. The area was conditioned by grinding and polishing to obtain an additional inspection at a greater depth from the inside surface. A much more severe condition was revealed after the test. The indications were classified as areas of chemical segregation and nonmetallic inclusions. The ring was considered unsatisfactory for the application and replacement of the defective ring from an acceptable billet was the most economical solution.