A Method for Grain Size Evaluation of Superalloys Based on Ultrasonic Phase Velocity
A high-temperature alloy and evaluation method technology, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, etc., can solve problems such as inaccurate measurement of longitudinal wave sound velocity, sound wave attenuation, and difficulty in distinguishing between the front of the bottom wave and the noise signal
Active Publication Date: 2015-09-30
CENT SOUTH UNIV
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Problems solved by technology
From the actual test situation, if the longitudinal wave sound velocity method is used to evaluate the grain size of superalloys, there is a problem that due to the serious attenuation of sound waves by superalloys, the amplitude of each bottom wave is small, and it is difficult to distinguish the front of the bottom wave from the noise signal. Disadvantages that lead to inaccurate measurement of longitudinal wave sound velocity and ultimately reduce evaluation accuracy
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[0047] see Figure 2-Figure 12 , this specific embodiment takes a batch of high-temperature alloys with the grade In718 as an example to illustrate the evaluation method of the present invention. In the present invention, the object to be detected is firstly fixed in a water tank filled with water, and the ultrasonic pulse generator / receiver (also known as ultrasonic instrument) is used to excite the ultrasonic longitudinal wave probe, and the ultrasonic longitudinal wave probe is clamped on the six-degree-of-freedom motion platform through the probe frame. The motion control card installed on the computer is connected to the control circuit to control the movement of the six-degree-of-freedom motion platform, adjust the posture of the ultrasonic probe in the tank, and use the high-speed data acquisition card on the computer to acquire and store the ultrasonic signals received by the ultrasonic instrument. Finally, further analysis and processing are carried out on the compute...
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The invention discloses a high-temperature alloy grain size evaluation method based on an ultrasonic phase velocity. The high-temperature alloy grain size evaluation method comprises the four steps of extracting original A wave information of a high-temperature alloy test block, calculating a longitudinal wave sound velocity of the test block, acquiring a phase velocity of the test block and constructing a comprehensive evaluation model. The high-temperature alloy grain size evaluation method has the technical effects that an attenuation coefficient spectrum is obtained through a two-medium multi-element Gaussian sound field model, and then a phase velocity spectrum is calculated according to the attenuation coefficient spectrum based on a K-K relational expression; compared with a phase difference algorithm for calculating the phase velocity, the algorithm disclosed by the invention is higher in stability, and the phase velocity of the curved-surface test block can be possibly extracted; moreover, in a process of using the K-K relational expression, the longitudinal wave sound velocity is used as a reference value, so that the high-temperature alloy grain size evaluation method actually integrates the advantages of a conventional ultrasonic longitudinal wave sound velocity method; meanwhile, the phase velocity and the dispersion degree of the phase velocity are considered, the multi-element sound velocity information is fully used, a comprehensive grain size evaluation model is constructed, and the precision of the sound velocity method for evaluating the grain size of high-temperature alloy is improved.
Description
technical field [0001] The invention relates to a method for measuring the grain size of a high-temperature alloy, in particular to a method for analyzing the phase velocity of an ultrasonic wave in a high-temperature alloy and using the ultrasonic phase velocity to perform non-destructive evaluation on the grain size of a high-temperature alloy. Background technique [0002] High-temperature alloys have outstanding advantages such as no macro-segregation, and are widely used in aerospace, military and other high-end fields, and grain size is an important factor affecting their mechanical properties and service life. [0003] At present, the grain size of superalloys is mainly detected by metallographic analysis. This method has the advantages of intuitive results and high detection accuracy, but the detection efficiency is low. The detection results can only reflect the grain conditions of the observed surface, and the detection accuracy is limited by the detection personnel...
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IPC IPC(8): G01N29/07
Inventor 李雄兵宋永锋倪培君胡宏伟杨岳罗意平司家勇刘锋江亮刘希玲
Owner CENT SOUTH UNIV