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热暴露对TC11/Ti-22Al-25Nb双合金盘力学性能的影响
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西北工业大学材料学院,西北工业大学材料学院,西北工业大学材料学院,西北工业大学材料学院

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国家自然科学基金资助(项目号51175431)


Effect of Thermal Exposure on Mechanical Properties in Welding Seam of TC11/Ti-22Al-25Nb Dual Alloy
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Shen Jing-Yuan,,,

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    摘要:

    对电子束焊+近等温成形的TC11/Ti-22Al-25Nb双合金模拟盘在热暴露后进行拉伸、持久试验并通过SEM和TEM观察断口形貌及组织的结果表明:热暴露后的试样在室温拉伸时,均断裂在焊缝位置。经550℃热暴露后室温拉伸试样的断裂属于延性断裂,600℃热暴露后室温拉伸试样的断裂属于脆性解理断裂,裂纹源均起始于试样的表面。随着热暴露温度的升高和时间的延长,室温拉伸强度总体提高,塑性下降,持久时间也降低,元素在焊接连接区域的分布更加均匀,成分曲线表现的更加平缓。

    Abstract:

    The microstructures and fracture morphologies at the fracture position of electron beam welding and near isothermally forged TC11/Ti-22Al-25Nb dual alloy simulation disc underwent thermal exposure at 550℃ and 600℃ for 300 h, 500h respectively, were investigated through tensile and stress-rupture experiments and observed by SEM and TEM. The results indicate that: after the thermal exposure of the samples at room temperature tensile, fracture at the weld position. After 550℃ thermal exposure, the fracture of tensile samples belong to ductile fracture while tensile samples belong to brittle cleavage fracture when it experienced 600 ℃ thermal exposure, and crack source always starts in surface of the sample. As the thermal exposure temperature increasing and time extend, an overall improvement in room temperature tensile strength, ductility decreases, lasting time is reduced, and the element of the welding connection area distributes more uniform, the composition curve becomes more smooth.

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申景园,姚泽坤,宁永权,邹书亮.热暴露对TC11/Ti-22Al-25Nb双合金盘力学性能的影响[J].稀有金属材料与工程,2018,47(8):2511~2517.[Shen Jingyuan, Yao Zekun, Ning Yongquan, Zou Shuliang. Effect of Thermal Exposure on Mechanical Properties in Welding Seam of TC11/Ti-22Al-25Nb Dual Alloy[J]. Rare Metal Materials and Engineering,2018,47(8):2511~2517.]
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  • 收稿日期:2016-09-07
  • 最后修改日期:2016-11-04
  • 录用日期:2016-11-11
  • 在线发布日期: 2018-10-17
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