Creep behavior of Alloy 617 in high temperature air and helium environments–effect of oxidation damage

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• 作者：Changheui Jang ; Sung Hwan Kim ; Injin Sah…
• 关键词：Creep rupture ; Alloy 617 ; Environmental effect ; Oxidation damage
• 刊名：Journal of Mechanical Science and Technology
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：30
• 期：10
• 页码：4433-4438
• 全文大小：5,102 KB
• 刊物类别：Engineering
• 刊物主题：Mechanical Engineering
  Structural Mechanics
  Control Engineering
  Industrial and Production Engineering
  
• 出版者：The Korean Society of Mechanical Engineers
• ISSN：1976-3824
• 卷排序：30

文摘

The creep behavior of a nickel-base superalloy, Alloy 617, which is considered as a candidate material for the very high temperature gas cooled reactor, was studied. Creep rupture tests were carried out at 800°C, 900°C and 1000°C in static and flowing helium environments as well as in air. Creep rupture life in static helium was longer than that in air, while it was shorter in flowing helium environments. Microstructure observation of the creep tested specimens showed that the shorter creep rupture life in flowing helium was associated with the thicker oxide layer, greater decarburization depth, and deeper internal oxidation happened during the creep tests. The degree of such oxidation damage was quantified for the creep tested specimens and correlated with the creep rupture life in different environments.