摘要
为了通过组织设计获得优异的性能,揭示TA15钛合金三态组织中的2种片层α相（次生片层α和转变β基体中细α条）的演化至关重要。采用等温压缩（在950,965和975℃）,结合双重热处理（在压缩温度以下10~40℃进行第1次热处理,然后在810°C进行第2次热处理）,研究了2种片层α相的演化规律。结果表明,在低于等温压缩温度以下10℃进行第1次热处理,可以获得单独分布的厚片层α相和细α条,这种细α条在第1次热处理后空冷具有集束的形态,而在第1次热处理后水冷具有针状形态。在低于等温压缩温度以下25℃进行第1次热处理,可以获得集束和网篮状的片层α相以及细α条。在低于等温压缩温度以下40℃进行第1次热处理,只能获得集束和网篮状的片层α相。另外,在第1次热处理温度相同的条件下,不同冷却方式对次生片层α相的形态影响较小。
It is critical to reveal the evolution rules of two types of α platelets（secondary lamellar α and thin α lath in transformed β matrix） in the tri-modal microstructure of TA15 alloy so as to obtain exceptional properties through microstructural design. The combined effects of isothermal compression（at 950, 965, and 975 °C） and subsequent double heat treatments（a high-temperature heat treatment at 10 °C to 40 °C below the compression temperature followed by a 810 °C heat treatment） on the evolution of the two types of α platelets were studied. The results show that the isolated lamellar α and the thin α lath can be produced by first heat treatment at 10 °C below the compression temperature and the thin α lath in this structure has a colony morphology under air cooling and an acicular morphology under water quenching. Colony and basketweave lamellar α and thin α lath can be produced when the first heat treatment is at 25 °C below the compression temperature. Only the colony and basketweave lamellar α can be produced when the first heat treatment temperature is 40 °C lower than the compression temperature. Besides, the morphology of lamellar α is not substantially influenced by cooling modes after the first heat treatment at the same temperatures.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第3期527-531,共5页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China for Key Program(50935007)
National Basic Research Program of China(2010CB731701)
National Natural Science Foundation of China(51175428)
"111"Project(B08040)
关键词
TA15钛合金
三态组织
片层α相
组织演化
TA15 titanium alloy
tri-modal microstructure
α platelet
microstructural evolution
