中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 12 No. 3 June 2002 |
high strength as-cast Ti-15-3 alloy
JIA Jun(賈 均)，GUO Jing-jie(郭景杰)，
SU Yan-qing(蘇彥慶)，F(xiàn)U Heng-zhi(傅恒志)
（State Key Laboratory of Precision Hot Processing of Metals，
Harbin Institute of Technology，Harbin 150001，China）
Abstract:The effects of heat treatment and solidification cooling rate on the microstructure and mechanical properties of as-cast Ti-15-3 alloy prepared by induction skull melting method were investigated. Results show that the microstructure of as-cast Ti-15-3 alloy changes from the features of simplified and larger size of beta grains to finer grain size with increasing solidification cooling rate. After solution treatment and different ageing treatment, alpha phase precipitates in grains interior as well as in grain boundaries. Due to the modification of the precipitate phase, the tensile strength and elongation of the alloy are imp roved simultaneously. A good combination of the values of 1.406GPa of σb and 4.5% of δ was obtained, which will be satisfied the use of this kind of alloy in critical areas.
Key words: cast Ti-15-3 alloy; solidification cooling rate; heat treatment; microstructure; mechanical properties
