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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 3    June 2002

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Microstructure and mechanical properties of 
high strength as-cast Ti-15-3 alloy
DING Hong-sheng(丁宏升),ZHOU Jian-zhong(周建中),
JIA Jun(贾  均),GUO Jing-jie(郭景杰),
SU Yan-qing(苏彦庆),FU 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

ISSN 1672-7029
CN 43-1423/U

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