Effect of duplex aging on the fracture toughness of hot-forged Ti-13V-11Cr-3Al alloy.

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  • Ｔｉ‐１３Ｖ‐１１Ｃｒ‐３Ａｌ合金熱間鍛造材への高温・低温２段時効の適用
  • Ti 13 V 11 Cr 3 Al ゴウキン ネッカン タンゾウザイ エ ノ

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Abstract

Effect of bi-modal microstructure on the fracture toughness of a commercial beta titanium alloy Ti-13V-11Cr-3Al was examined. Bi-modal microstructure is obtained through combination of aging at high temperature and re-aging at low temperature after solution treatment. The bi-modal microstructure is composed of coarse and fine alpha precipitates and beta matrix. The bi-modal microstructure improves fracture toughness-strength balance compared with the microstructure produced by aging at a single temperature after solution treatment. Although the specimens re-aged at 723K for 360ks after aged at 873K or 923K for 10.8ks have almost the same strength of the specimen aged at 723K for 288ks, they have about 40% higher fracture toughness than the specimen aged at a single temperature. The fracture surface ahead of fatigue pre-crack of the CT specimen with bi-modal microstructure has larger and deeper dimples compared with the specimen aged at a single temperature. The fact indicates that larger amount of plastic deformation is necessary for crack propagation from the tip of fatigue pre-crack in the bi-modal microstructure.

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