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张潇,陈立佳,赵子博,刘建荣,王清江.冷却方式对BT25y钛合金显微组织和拉伸性能的影响[J].稀有金属材料与工程(英文),2018,47(1):321~325.[zhangxiao,Chen Lijia,Zhao Zibo,Liu Jianrong and Wang Qingjiang.Influence of Cooling Method on Microstructure and Tensile Properties of BT25y Titanium Alloy[J].Rare Metal Materials and Engineering,2018,47(1):321~325.]
Influence of Cooling Method on Microstructure and Tensile Properties of BT25y Titanium Alloy
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Received:November 05, 2015  Revised:January 07, 2016
Key words: BT25y titanium alloy  cooling method  phase component  tensile properties
Foundation item:新世纪优秀人才支持计划(NCET-13-0788)
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zhangxiao,Chen Lijia,Zhao Zibo,Liu Jianrong and Wang Qingjiang  
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      The effect of cooling rate on microstructure and tensile properties of BT25y titanium alloy were studied using OM, SEM, XRD, and TEM methods. The results indicate that the microstructure of the air-cooled specimen consists of α and β transformed phase, while in oil- and water-quenched microstructure, α, α" and α" martensite phase were found. Lattice parameters of α" phase obtained by XRD analysis show that a is shorter, b is longer in water-quenched microstructure than in oil-quenched one. After aging treatment at 550 ℃/6 h followed by air cooling, the phase component is the same with its unaged counterpart in air-cooled condition; martensite phase decomposed into stable α and β phase in oil- and water-quenched conditions. Room temperature tensile properties after aging treatment were tested. Compared with the air-cooled sample, tensile and yield strength of the sample after oil and water quenching were much higher, accompanied with much lower elongation. The phenomenon was thought to be related to the shape and size of secondary α phase.