Evaluation of hastelloy N alloys after nine years exposure to both a ...

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8 Pig. 7. Cross section of oxidized region adjacent to hole in failed section of loop. As polished, about 14X. also included frozen salt that had leaked out, and a layered oxide found on both sides of the foil. The electron beam scanning images are shown in Fig. 9. The quantitative values are given in Table 2. The analysis of the spongy-oxide-salt mixture combination shows an agglomerate of oxides and metal which includes the elements zirconium, molybdenum, iron, nickel, and chromium. The composition shown in Table 2 reflects an average of three readings in different areas for each element. The zirconium probably comes from the salt, while the other elements are constituents of the alloy which have been removed from the Hastelloy N during the failure process. Table 2. Composition of foil and oxide in the failed region Weight percenp Ni Fe Cr Mo Zr Foil 90.0 0.8 9.1
'L, . *. . . Fig. 8. Failed region of loop 1255. (a) Macrograph of modified Hastelloy N-2% Nb tubing and the failure. Circled area was analyzed with the electron beam microanalyzer. (b) Optical micrograph of circled area. 9 I '
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Page 13: f 7 Fig. 6. Failed region of Hastel
Page 17 and 18: * ' hd Fig. 10. Micrograph of modif
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Page 21 and 22: L, 15 Fig. 15. Inside surface of mo
Page 23 and 24: 8 R 17 Fig. 18. Inside surface of s
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Page 27 and 28: i 4 21 Fig. 24. Outside surface of
Page 29 and 30: U c t 1. W 23 Fig. 28. Outside surf
Page 31 and 32: i ! i 25 Fig. 31. Outside surface,
Page 33 and 34: i ' L tj t i 27 Y-111351 Fig. 33. W
Page 35 and 36: LJ L f 29 corrosion-product concent
Page 37 and 38: L, 4 Table 5. Analyses of fluoride
Page 39 and 40: a 1 33 Fig. 39. Microstructure of t
Page 41 and 42: W c f I' . 4 , 44 35 Table 7. Thic
Page 43 and 44: u c i w J. M. Dale (3) Central Rese

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