Metallurgical Analysis of Failed AISI 304L Stainless Steel Tubes Used in Launch Vehicle Applications

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• 作者：Sushant K. Manwatkar ; Kailas S. Kuhite…
• 关键词：AISI 304 stainless steel ; Vibration testing ; Fatigue failure ; Fatigue striations ; Stress concentration ; Inclusions
• 刊名：Metallography, Microstructure, and Analysis
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：4
• 期：6
• 页码：497-507
• 全文大小：3,847 KB
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• 作者单位：Sushant K. Manwatkar (1)
  Kailas S. Kuhite (2)
  S. V. S. Narayana Murty (1)
  P. Ramesh Narayanan (1)
  
  1. Materials and Metallurgy Group, Material Characterization Division, Vikram Sarabhai Space Centre, Trivandrum, 695 022, India
  2. CSC, Liquid Propulsion Systems Center, Valiamala, Trivandrum, 695 547, India
  
• 刊物主题：Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology;
• 出版者：Springer US
• ISSN：2192-9270

文摘

Two numbers of AISI 304L stainless steel tubes with ?6 and ?4 mm used in pressurisation system module of a liquid engine of a satellite launch vehicle were found to crack after the qualification level random vibration test. The module has undergone resonance survey, sinusoidal vibration, and random vibration along two different axes before the occurrence of failure. The tubes failed during third-axis random vibration test. The failed tubes were subjected to detailed metallurgical analysis to understand the reasons for failure. The location of failure in both tubes was at the cross-section change area in the nipple. Cross-section change was provided in the design to reduce the diameter of the nipple to suit to tube diameter for welding. The cross-section change in the nipple acted as stress concentration resulting in the initiation of fatigue cracks. The presence of sharp-cornered inclusions in the material helped easy crack initiation. Smaller radius and angle at the weld–parent interface resulted in additional stress concentration. The presence of striations on the fracture surface and slip bands near to the fracture edge confirm that the failure of tubes to be due to vibration induced fatigue. Keywords AISI 304 stainless steel Vibration testing Fatigue failure Fatigue striations Stress concentration Inclusions