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Ti5321钛合金BASCA处理不同冷却速度下的片层形态和性能研究
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西北有色金属研究院

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Study on Microstructure and Mechanical Properties of Ti5321 Titanium Alloy at Different Cooling Rates with BASCA treatment
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Northwest Institute for Non-ferrous Metal Research

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    摘要:

    为了研究冷却速度对新型高强韧钛合金Ti5321显微组织和力学性能的影响,本文研究了Ti5321合金在不同BASCA处理后的组织和力学性能。结果表明,Ti5321合金β区固溶后缓慢冷却过程中冷却速率对α片层尺寸有决定性影响。片层尺寸随着冷却速率的减小而增大,片层在长度方向的生长速率远快于厚度方向的生长速率。同时,随着冷却速度的降低,合金的强度降低。但损伤容限特性显示出强度的反向趋势。本试验中当冷却速度为0.5℃/min时,合金抗拉强度超过1200MPa、同时具有良好的断裂韧性(KIC≥65MPa.m1/2)。

    Abstract:

    In order to analyze the effect of cooling rate on lamellar morphology and mechanical properties during BASCA treatment in Ti5321 alloy, the lamellar morphology and mechanical properties of the titanium Ti5321 alloy under different BASCA treatment are comprehensively studied. The results show that the cooling rates have decisive influence on the alpha lamellar size formed at slow cooling process after β zone solution. The lamellar size of Ti5321 alloy keeps increase with the decrease of cooling rate, and the growth rate of lamellar in the length direction is much faster than that in the thickness direction. With the increase of cooling rate, the strength of the alloy is in-crease,but the fracture toughness decreases. The cooling rate of 0.5℃/min in this experiment is the optimal cool-ing way which the ultimate tensile strength of alloy can exceed 1200MPa with an excellent fracture tough-ness(KIC≥65MPa.m1/2).

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周伟,赵永庆,辛社伟,李倩,王欢,张思远. Ti5321钛合金BASCA处理不同冷却速度下的片层形态和性能研究[J].稀有金属材料与工程,2020,49(7):2314~2318.[Zhou Wei, ZHAO Yongqing, XIN Shewei, LI Qian, WANG Huan, ZHANG Siyuan. Study on Microstructure and Mechanical Properties of Ti5321 Titanium Alloy at Different Cooling Rates with BASCA treatment[J]. Rare Metal Materials and Engineering,2020,49(7):2314~2318.]
DOI:10.12442/j. issn.1002-185X.20190304

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  • 收稿日期:2019-04-09
  • 最后修改日期:2019-11-27
  • 录用日期:2019-11-29
  • 在线发布日期: 2020-08-31
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