| The microstructural alteration of α phase by various solution treatment and cooling conditions have been studied for Ti-6Al-4V alloy. Edge shape α phases were formed when it was the first solution treated at β region and the second solution treated at 960℃ or 930℃, followed by water quenching. Floral pattern structures were formed when it was the first solution treated at β region and the second solution treated at 960℃ or 930℃, followed by air cooling. When the specimen was the second solu-tion treated at 960℃ or 930℃, and furnace cooled, edge shape α phase changed its morphology to equiaxed structure. The second solution treatment at 900℃, followed by water quenching, had fine and homogene-ous mixed structures of equiaxed and widmanstatten structure with retained β phase as martensite. This is considered to be optimum microstructure to improve mechanical properties. |
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