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Vol.36, No.12, 2052 ~ 2059, 1998
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| Title |
| Effects of Thermomechanical Processing on Mechanical Properties of Ti-6Al-4V Alloys (2) Fatigue Crack Propagation Behavior |
| 조용성 , 김상식 , 최승주 , 박노광 Y . S . Cho , S . S . Kim , S . J . Choe , N . K . Park |
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| Abstract |
| Fatigue crack propagation behaviors of Ti-6Al-4V alloys, produced through different thermomechanical processing routes, were examined at 25 and 316℃. The microstructure containing acicular α+β phases in the coarse prior β grain demonstrated better resistance to fatigue crack propagation (FCP) than equiaxed α+transformed β or α` structures. The crack tortuosity and crack closure in the acicular α structure were higher than those of the other microstructures, which was believed to be responsible for the improved FCP resistance. At 316℃, both equiaxed α+ transformed β and α` structures did not show any degradation in FCP resistance. For acicular α structure which showed the highest FCP resistance at room temperature, on the other hand, the crack tortuosity was greatly reduced and, resultantly, FCP resistance was reduced at 316℃. |
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