TC4板材组织特征与超声检测信号对应关系研究
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1.北京航空材料研究院,北京 100095;2.航空材料检测与评价北京市重点实验室,北京 100095;3.中国航空发动机集团材料检测与评价重点实验室,北京 100095

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TG115.28

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Relationship Between Ultrasonic Signal and Microstructure of TC4 Titanium Alloy Plate
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Affiliation:

1.Beijing Institute of Aeronautical Materials,Beijing 100095;2.Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing 100095;3.Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation;Aero Engine Corporation of China,Beijing 100095

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    摘要:

    在大厚度板材在轧制过程中,由于工艺控制不当易引起材料组织分布不均匀、粗大晶粒等问题,本文针对TC4轧制板材研究超声检测信号对材料内部组织分布的表征情况。结果表明,声波垂直于板材流线方向入射时,声衰减分布均匀;而平行入射时,声衰减分布极不均匀,呈条带状分布。为此,对引起不同声波衰减的截面进行组织分析,金相观察发现超声波衰减与材料内部α相的分布及形态有关:声衰减小的区域,材料内部等轴α相较多,晶粒细小,分布均匀;声衰减大的区域,α相被明显拉长。

    Abstract:

    In the rolling process of thick plates, it is easy to have problems of uneven distribution of material structure and coarse grains due to improper process control. In this paper, ultrasonic testing signal on the internal structure of TC4 rolled plate is studied. The results show that the sound attenuation distribution is uniform when the sound wave is incident perpendicular to the plate streamline direction. However, the distribution of sound attenuation is very uneven and stripped in stripe shapes when the incident wave is parallel. For this reason, the section structure with different acoustic attenuation is analyze. It is found that the ultrasonic attenuation is related to the distribution and morphology of α phase in the material:in the area where the sound attenuation is reduced, there are more equiaxed α phases in the material, and the grains are fine and evenly distributed; in the area with large acoustic attenuation, α phase is obviously elongated, the tissue distribution is not uniform, and there is stripe structure.

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王铮,黄利军,林立志. TC4板材组织特征与超声检测信号对应关系研究[J].宇航材料工艺,2022,52(6):87-91.

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历史
  • 收稿日期:2021-06-22
  • 最后修改日期:2021-08-30
  • 录用日期:2021-09-02
  • 在线发布日期: 2022-12-23
  • 出版日期: 2022-12-30