Aluminium-Nickel-Iron Alloys Resistant to Corrosion by Water at High Temperature. Basis for Their Properties-Their Improvement; LES ALLIAGES ALUMINIUM-FER-NICKEL RESISTANT A LA CORROSION PAR L'EAU A HAUTE TEMPERATURE. BASES DE LEURS PROPRIETES-LEUR AMELIORATION
Technical Report
·
OSTI ID:4147538
The development of the investigations carried out on these alloys is reviewed, showing the establishment of their fundamental, particularly structural, properties. The penetration process in corrosion was studied. The results of micrographic studies of the metal oxide interface are given for a series of alloys treated in water and steam between 350 and 395 deg C. The hypothesis of attack by pockets of gas pressure is corroborated, and a second process of deep penetration by islands of intergranular-type corrosion is shown to take place. These patches, distinct from the surface corrosion layer and sometimes forming at a considerable depth inside the metal, would be due to heterogeneities in composition of the solid solution making up the matrix of these alloys. The role of titanium and zirconium additions on rolled metal was also studied. Systematic studies were carried out on a series of alloys with titanium and zirconium contents between 0.05 and 0.15 per cent. The favorable effect of titanium in particular was demonstrated. Zirronium acts in the same way, but less efficiently. The improvement due to these additions can be compared to their action on the distribution of the second phases. which tend to become more pronounced and more homogeneously distributed. The irfluence of welding on these alloys has been studied, showing up the part played by the structure gradients introduced by fusion. (auth)
- Research Organization:
- France. Commissariat a l'Energie Atomique, Paris
- NSA Number:
- NSA-14-011925
- OSTI ID:
- 4147538
- Report Number(s):
- CEA-1313
- Country of Publication:
- France
- Language:
- English
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