| タイトル | NDE of PWA 1480 single crystal turbine blade material |
| 著者（英） | Dreshfield, Robert L.; Klima, Stanley J.; Orange, Thomas W. |
| 著者所属（英） | NASA Lewis Research Center |
| 発行日 | 1993-01-01 |
| 言語 | eng |
| 内容記述 | Cantilever bending fatigue specimens were examined by fluorescent liquid penetrant and radioactive gas penetrant (Krypton) Nondestructive Evaluation (NDE) methods and tested. Specimens with cast, ground, or polished surfaces were evaluated to study the effect of surface condition on NDE and fatigue crack initiation. Fractographic and metallurgical analyses were performed to determine the nature of crack precursors. Preliminary results show that fatigue strength was lower for specimens with cast surfaces than for specimens with machined surfaces. The liquid penetrant and gas penetrant techniques both provided indications of a large population of defects on the cast surfaces. On ground or polished specimen surfaces, the gas penetrant appeared to estimate the actual number of voids more accurately than the liquid penetrant. |
| NASA分類 | QUALITY ASSURANCE AND RELIABILITY |
| レポートNO | 95A93651
SAE PAPER 931371 |
| 権利 | Copyright |
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