Microstructure and mechanical properties of high strength as-cast Ti-15-3 alloy

来源期刊：中国有色金属学报(英文版)2002年第3期

论文作者：丁宏升 贾均 郭景杰 苏彦庆 傅恒志 周建中

文章页码：445 - 449

Key words：cast Ti-15-3 alloy; solidification cooling rate; heat treatment; microstructure; mechanical properties

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 σ_b and 4.5% of δ was obtained, which will be satisfied the use of this kind of alloy in critical areas.