Assessment of Embrittlement of VHTR Structural Alloys in Impure Helium Environments Page: 52 of 63
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Meg= PO EH =1G W- 1 m * =tA 4 =5E
Figure 54 SEM image of the fracture surface of GB-eci Alloy 617 tested at 700 C in helium (Test
Small grain size, and intergrannular cracking, and many crack branches are observed.
Figure 55 and Figure 56 show the oxidation of as-received and GBE Alloy 617, respectively. A
thin chromium oxide layer is observed in both samples. A slight presence of an aluminum-rich
phase is observed in both the GBE and as-received samples.51
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Crone, Wendy; Cao, Guoping & Sridhara, Kumar. Assessment of Embrittlement of VHTR Structural Alloys in Impure Helium Environments, report, May 31, 2013; United States. (https://digital.library.unt.edu/ark:/67531/metadc836772/m1/52/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.