Low cycle fatigue behaviour of nickel base superalloy IN 740H at 760° C: Influence of fireside corrosion atmosphere
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
View Archive Info| Field | Value | |
| Title |
Low cycle fatigue behaviour of nickel base superalloy IN 740H at 760° C: Influence of fireside corrosion atmosphere
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| Creator |
Jena, P S M
Singh, R K Mahanta, L Paswan, S Sahu, J K |
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| Subject |
Corrosion Science
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| Description |
Interaction of fireside corrosion atmosphere and fatigue damage in A-USC boiler alloy IN 740H was studied by conducting fatigue experiments on bare and salt coated (58%Na2SO4 + 39%K2S2O7 + 2%NaCl + 0.5%CaSO4) specimens at 760 degrees C followed by extensive electron microscopy. The salt mixture fused and released SO3 gas during fatigue tests. Fatigue life was significantly reduced due to fireside corrosion atmosphere. Fluxing of complex oxide layer and extensive surface cracking is ascertained to be the reason of premature fatigue failure at lower Delta epsilon(t)/2 (e.g. 0.3%), however, at higher Delta epsilon(t)/2 e.g. 0.7%, breaking of oxide scales and surface pitting are the causes of early fatigue failure.
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| Publisher |
Elsevier
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| Date |
2018-11
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| Type |
Article
PeerReviewed |
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| Relation |
https://doi.org/10.1016/j.ijfatigue.2018.07.018
http://eprints.nmlindia.org/7237/ |
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| Identifier |
Jena, P S M and Singh, R K and Mahanta, L and Paswan, S and Sahu, J K (2018) Low cycle fatigue behaviour of nickel base superalloy IN 740H at 760° C: Influence of fireside corrosion atmosphere. International Journal of Fatigue, 116 (IF-3.673). pp. 623-633.
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