Metallurgical Analysis of Cracked AA7075 Aluminum Alloy Component Used in Control System of a Satellite Launch Vehicle

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• 作者：Sushant K. Manwatkar ; J. Srinath…
• 关键词：AA7075 alloy ; Intergranular cracking ; Dendritic Coring ; Stress corrosion cracking
• 刊名：Journal of Failure Analysis and Prevention
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：16
• 期：6
• 页码：1141-1149
• 全文大小：3,368 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Tribology, Corrosion and Coatings
  Characterization and Evaluation Materials
  Mechanics
  Structural Mechanics
  Quality Control, Reliability, Safety and Risk
  
• 出版者：Springer Boston
• ISSN：1864-1245
• 卷排序：16

文摘

High-strength aluminum alloy AA7075 forgings are widely used in various control system components of liquid engines of satellite launch vehicles. In one such application, a forged component was found to crack under storage. Multiple cracks were noticed on the surface of the component. Fractographic features indicated intergranular mode of failure. Optical microscopic examination revealed dendritic coring in the material and crack propagation to be along the grain boundaries. Anodic dissolution of grain boundaries was also noticed. Based on detailed metallurgical investigations, it was concluded that the failure was due to ‘stress corrosion cracking.’