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Ti5321鈦合金B(yǎng)ASCA處理不同冷卻速度下的片層形態(tài)和性能研究
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西北有色金屬研究院

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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:

    為了研究冷卻速度對(duì)新型高強(qiáng)韌鈦合金Ti5321顯微組織和力學(xué)性能的影響,本文研究了Ti5321合金在不同BASCA處理后的組織和力學(xué)性能。結(jié)果表明,Ti5321合金β區(qū)固溶后緩慢冷卻過(guò)程中冷卻速率對(duì)α片層尺寸有決定性影響。片層尺寸隨著冷卻速率的減小而增大,片層在長(zhǎng)度方向的生長(zhǎng)速率遠(yuǎn)快于厚度方向的生長(zhǎng)速率。同時(shí),隨著冷卻速度的降低,合金的強(qiáng)度降低。但損傷容限特性顯示出強(qiáng)度的反向趨勢(shì)。本試驗(yàn)中當(dāng)冷卻速度為0.5℃/min時(shí),合金抗拉強(qiáng)度超過(guò)1200MPa、同時(shí)具有良好的斷裂韌性(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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引用本文

周偉,趙永慶,辛社偉,李倩,王歡,張思遠(yuǎn). Ti5321鈦合金B(yǎng)ASCA處理不同冷卻速度下的片層形態(tài)和性能研究[J].稀有金屬材料與工程,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
  • 錄用日期:2019-11-29
  • 在線發(fā)布日期: 2020-08-31
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