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TC11钛合金热变形机制及其热加工图
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Hot Deformation Mechanism and Processing Map of TC11 Alloy
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    摘要:

    研究了TC11钛合金在温度800~1050 ℃,应变速率0.005~5 s-1条件下的高温压缩变形行为,基于动态材料模型建立了热加工图,并结合变形微观组织观察确定了该合金在实验条件下的高温变形机制。结果表明:TC11钛合金在两相区低应变速率下(0.005~0.05 s-1)变形时主要发生片状组织的球化,并且球化的效果随变形温度的降低和应变速率的增加而增加。在两相区高应变速率下(0.05~5 s-1)变形时发生热加工的非稳定流动,产生剪切裂纹和剪切带等缺陷。在β相区低应变速率下(0.005~0.05 s-1)变形时发生动态再结晶,高应变速率下(0.05~ 5 s-1)发生动态回复,并且应变速率大于0.1 s-1时有可能发生不稳定流动现象。在变形温度为900 ℃左右、应变速率为0.005 s-1时,功率耗散率达到峰值,约为57%。

    Abstract:

    The hot deformation behaviors of TC11 alloy were investigated at temperature range of 800~1050 ℃ and strain rate range of 0.005~5 s-1. Based on dynamic materials modeling (DMM) the processing map was established. Combined with the microstructure observation the hot deformation mechanism of TC11 alloy was worked out. The results show that the globularization of lamella α is the main deformation mechanism at low strain rate (0.005~0.05 s-1) in the (α+β) phase field. The globularization intensities increasing obviously with decreasing of temperature and increasing of strain rate. The unstable flowing will occur at high strain rate (0.05~5 s-1), and shear crack and shear bands will take place. In the β phase field, the dynamic recrystallization occurs at low strain rate (0.005~0.05 s-1) and the dynamic recovery occurs at high strain rate (0.05~5 s-1). Furthermore, the flow instability maybe occur when the strain rate is higher than 0.1 s-1. The peak efficiency of power dissipation of about 57% is obtained at about 900 ℃ and 0.005 s-1.

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单德彬,史 科,徐文臣,吕 炎. TC11钛合金热变形机制及其热加工图[J].稀有金属材料与工程,2009,38(4):632~636.[Shan Debin, Shi Ke, Xu Wenchen, Lü Yan. Hot Deformation Mechanism and Processing Map of TC11 Alloy[J]. Rare Metal Materials and Engineering,2009,38(4):632~636.]
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  • 收稿日期:2008-03-25
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