Abstract
Electrolytically controlled corrosion tests on Nimonic 90 showed good resistance to chloride ions, regardless of heat treatment, in room temperture tests without and with fatigue stress application, as long as the specimen surface was undamaged. However, as soon as a surface crack formed, it spread rapidly by different mechanisms. Tests in NaCl and MgCl//2 solutions showed that heat treatment has a bearing on the corrosion potential only in NaCl solutions. Crack propagation is intercrystalline at the beginning but becomes increasingly transcrystalline with time. It is suggested tjat in further development work on these alloys emphasis be placed on fast self-passivation of fresh fracture surfaces.
| Translated title of the contribution | Fatigue Stress Corrosion Cracking of Tensile Test Specimens of a Nickel Cobalt Base Alloy in Chloride Ion Containing Media at 200 C. |
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| Original language | German |
| Pages (from-to) | 486-496 |
| Number of pages | 11 |
| Journal | Materials and Corrosion |
| Volume | 27 |
| Issue number | 7 |
| State | Published - 1976 |