Investigation of the corrosion behaviour of a NiCrMo alloy in nuclear process heat helium by means of X-ray diffraction and electron probe microanalysis
✍ Scribed by Dr. U. Zimmermann; Dr. H. Grimmer
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- German
- Weight
- 540 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0947-5117
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✦ Synopsis
Samples of the nickel base alloy Nimonic 86 were exposed to PNP-500 type helium for 1000 h at 650, 750, 850, 900 and 950 "C. X-ray diffraction showed 5 additional phases, formed at the sample surfaces during the heat treatment. They were shown to be: 1) a spinel Cr2Mn0, (at T 3 850 "C) containing increasing amounts of A l and Ti with increasing temperature, 2) a sesquioxide Cr203 (at T 900 "C) containing substantial amounts of Mn for T 3 850 "C, 3) an q, oxide Ni3M030 (mainly at 750 "C) containing some Fe, 4) an ql carbide (Ni, Cr, Si),Mo,C (at T 3 750 "C), 5 ) Cr&6 (at T 2 850 "C) containing some Mo.
Proben der Nickelbasis-Legierung Nimonic 86 wurden in PNP-500artigem Helium wahrend 1000 h bei 650, 750, 850, 900 und 950 "C ausgelagert. Rontgendiffraktion zeigte nach der Warmebehandlung 5 neu gebildete Phasen an den Probenoberflachen. Ihre Bestimmung ergab 1) einen Spinell Cr2Mn04 (fur T 3 850 "C), dessen Al-und Ti-Gehalt mit zunehmender Temperatur zunimmt, 2) ein Sesquioxid Cr203 (fur T S 900 "C) rnit einem betrachtlichen Mn-Gehalt fur T 3 850 "C, 3) ein q1 Oxid Ni3M030 (hauptsachlich bei 750 "C) mit geringem Fe-Gehalt, 4) ein q1 Karbid (Ni, Cr, Si);Mo3C (fur T 3 750 "C), 5 ) CrZ3C6 (fur T 3 850 "C) mit etwas Mo.