New type 321 corrosion-resistant steel heat shields were cracking during welding operations. A failure analysis was performed. The cause was found to be chloride induced stress-corrosion cracking. Packaging was suspected and confirmed to be the cause of the chloride contamination. A contributing factor was the length of time spent in the packaging, 21 years.
S.C. Binard, 2019. "Failure Analysis of Gas Turbine Engine Fuel Nozzle Heat Shields", ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions
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