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万明攀,曾玉金,谭元标,黄朝文,赵永庆.等温条件下Ti-1300合金亚稳β相的分解动力学[J].稀有金属材料与工程(英文),2019,48(12):3855~3862.[Wan Mingpan,Zeng Yujin,Tan Yuanbiao,Huang Chaowen and Zhao Yongqing.Decomposition Kinetics of Metastable β Phase in Ti-1300 Alloy under Isothermal Conditions[J].Rare Metal Materials and Engineering,2019,48(12):3855~3862.]
Decomposition Kinetics of Metastable β Phase in Ti-1300 Alloy under Isothermal Conditions
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Received:June 26, 2018  Revised:July 26, 2018
DOI:
Key words: Decomposition kinetics  mechanism of phase transformation  Ti-1300 alloy  TTT diagram
Foundation item:国家自然科学基金项目(青年基金)
Author NameAffiliation
Wan Mingpan,Zeng Yujin,Tan Yuanbiao,Huang Chaowen and Zhao Yongqing  
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Abstract:
      Phase transformation kinetics of Ti-1300 alloy after solution treatment were investigated under isothermal conditions in the temperature range of 400 to 700℃ by using dilatometric method. The decomposition kinetic equation of metastable β phase in the alloy was constructed under isothermal conditions by analyzing the experimental data in the theoretical frame of the Johnson-Mehl-Avrami theory. The different values of k and n parameters were obtained in the temperature range of 400 to 420℃ and 500 to 700℃, indicating that the mechanism of the phase transformation was different in different temperature ranges. The decomposition mechanism of metastable β phase is βm→β′+β→α+β at the temperature of 400 to 420℃, whereas the decomposition mechanism of metastable β phase is βm→α+β at the temperature of 500 to 700℃. When the metastable β phase of Ti-1300 alloy was annealed isothermally at a given temperature, the amount of α phase increased firstly, and then reached a stable value with increasing the holding time. Based on calculation and experimental results, time-temperature-transformation diagrams (TTT diagram) of Ti-1300 alloys were plotted for the metastable β phase decomposition under isothermal conditions from 500 to 700℃. And the nose temperature of the TTT diagram of the alloy is around 600℃ for the Ti-1300 alloys.