Microstructure evolution of isothermal holding treatment during melt solidification of Ti-6Al-4V alloy

Shou Yin Zhang, Jin Shan Li, Hong Chao Kou, Jie Ren Yang, Guang Yang, Jun Wang

科研成果: 期刊稿件文章同行评审

5 引用 (Scopus)

摘要

Abstract Effect of isothermal holding treatment in the solidification process on the microstructure of Ti-6Al-4V alloy was studied by temperature controlled induced melting apparatus. The result shows that with isothermal holding treatment above the β transus temperature during solidification, the colony structure consisting of parallel lamellae was obtained. While the isothermal holding treatment was set at 960 °C, a unique bi-modal microstructure consisting of coarse primary α and fine secondary lamellar α was obtained. The primary lamellar α tended to break into several pieces, globularize and present equiaxed morphology. The formation mechanism of the equiaxed α can be explained with the atom immigration, high density dislocations, combined action with the interface tension of formed α phase during the isothermal holding treatment. After the isothermal holding, the retained α matrix transformed into fine lamellar α, thus, bi-modal microstructure was acquired. Compared with the lamellar structure, the grain boundary α presented discontinuously and cannot be distinguished from the primary α lamellae easily. The size of colonies α was greatly decreased. The microstructure tended to be much more homogeneous in the whole section of the samples.

源语言英语
文章编号63702
页(从-至)1091-1096
页数6
期刊Transactions of Nonferrous Metals Society of China (English Edition)
25
4
DOI
出版状态已出版 - 1 4月 2015

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