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2219 aluminum alloy ingot casting average grain size ultrasonic assessment method

A technology of average grain size, aluminum alloy ingot, applied in particle size analysis, particle and sedimentation analysis, measuring device, etc., can solve the problems of test result influence, low precision, easy to be interfered, etc., and achieve accurate and efficient evaluation method , Improve the accuracy and avoid the effect of errors

Active Publication Date: 2019-08-16
CENT SOUTH UNIV
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Problems solved by technology

Due to the skin effect of the eddy current method during the detection process, the detection results can only reflect the performance of the surface of the test piece, and the accuracy is not high
The ultrasonic method can be divided into the sound velocity method, the attenuation method, etc. When the sound velocity method or the attenuation method is used alone to analyze the grain size information of the workpiece, since the echo signal is a non-stationary signal and is susceptible to interference, the measured value of the ultrasonic sound velocity and attenuation coefficient itself will also be affected. There is a large random error. In addition, the residual stress field inside the workpiece will also affect the test results

Method used

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  • 2219 aluminum alloy ingot casting average grain size ultrasonic assessment method
  • 2219 aluminum alloy ingot casting average grain size ultrasonic assessment method
  • 2219 aluminum alloy ingot casting average grain size ultrasonic assessment method

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Embodiment Construction

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples of implementation.

[0042] The specific implementation method is to conduct research on two 2219 aluminum alloy ingots of φ1380mm and one 2219 aluminum alloy ingot of φ800mm. Among the two φ1380mm ingots, one is a conventional casting ingot and the other is an ultrasonic-assisted casting ingot; the φ800mm ingot is a conventional casting ingot.

[0043] Cut out a circular cake with a thickness (in the axial direction of the cylindrical ingot) of 15mm from three circular ingots at a distance of 200mm from one end of the axial direction, and then cut out five samples of 40mm×40mm×15mm in the radial direction on the circular cake , the general location layout of five samples: the first one is located on the outer diameter, the second one is located at a radius of 3 / 4 from the center of the circle, the third one is located at a radius of 1 / 2 from the ce...

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Abstract

The invention discloses a 2219 aluminum alloy ingot casting average grain size ultrasonic assessment method, especially a method for establishing an average grain size ultrasonic evaluation model by analyzing the propagation sound velocity, attenuation coefficient and like parameters of the ultrasonic in the 2219 aluminum alloy ingot casting test block and considering the influence of the residualstress, and the ultrasonic evaluation model is used for high-precisely evaluating the 2219 aluminum alloy ingot casting average grain size. The model is scientific and simple in establishment process, the obtained data is precise, the obtained model is strong in applicability, a fitting result is precise, and the large-scale industrial application is convenient. And meanwhile, the model developedby the invention provides a necessary condition for the nondestructive detection.

Description

technical field [0001] The invention relates to a high-precision evaluation method for the average grain size of a 2219 aluminum alloy ingot, especially by analyzing parameters such as the sound velocity and attenuation coefficient of ultrasonic waves propagating in a 2219 aluminum alloy ingot test block, and considering the influence of residual stress, Establish an ultrasonic evaluation model of its average grain size, which is used to evaluate the average grain size of 2219 aluminum alloy ingots with high precision. Background technique [0002] The 2219 aluminum alloy has the characteristics of high strength, weldability and heat resistance, and is widely used in the aerospace field. The grain size of the alloy, especially the grain size in the ingot stage, not only affects the subsequent processing performance, but also affects its processing properties after being processed into components. Therefore, the efficient and reliable detection of its grain size can provide d...

Claims

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Application Information

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IPC IPC(8): G01N15/02
CPCG01N15/02
Inventor 龚海曹轩吴运新雷洋孙燕杰孙晓亮易彬
Owner CENT SOUTH UNIV
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