期刊
METALS AND MATERIALS INTERNATIONAL
卷 25, 期 6, 页码 1428-1435出版社
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-019-00304-4
关键词
Massive phase transformation; Titanium alloys; Dislocation; Misorientation; Phase stability; Additive manufacturing
资金
- Korea Evaluation Institute of Industrial Technology (KEIT)
- Ministry of Trade, Industry, and Energy, Republic of Korea [10062485]
- IONS Co. Ltd.
- Korea Evaluation Institute of Industrial Technology (KEIT) [10062485] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The occurrence of a massive phase (alpha(m)) transformation and a thermal decomposition of an alpha(m) to fine lamellar alpha/beta with an alpha lamellar width of approximately 1 mu m have been identified in additively manufactured Ti-6Al-4V alloy by directed energy deposition. The beta to alpha(m) phase transformation during additive manufacturing generated a high dislocation density, which was calculated by the kernel average misorientation. This caused a significant change in the Gibbs free energy of alpha, resulting in the nucleation of the beta phase becoming preferable in the area with high dislocation density at temperature below the beta-transus temperature. Subsequent annealing at 850 degrees C altered the massive morphology to lamellar due to the formation of a beta phase between alpha lamellar boundaries.
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