An Ultrasonic Shear Wave Sound Velocity Measurement Method for Nickel-based Alloy Bolts Used in the Main Valve of Ultra-Supercritical Generating Sets
A technology of nickel-based alloy and generator set, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc. It can solve the problems of good measurement, great difference in ultrasonic shear wave sound speed, and short running time of ultra-supercritical generator sets, so as to save a lot of money Effects of cost, accurate sound velocity
Inactive Publication Date: 2018-01-09
代真
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Problems solved by technology
However, the running time of the ultra-supercritical generator set is short, and the price of nickel-based alloy bolts is extremely expensive. One piece is about 100,000 yuan. It is not allowed to destroy it and then process it into a test block for ultrasonic testing to measure its ultrasonic shear wave sound velocity.
In addition, the ultrasonic shear wave sound velocity of nickel-based alloy bolts is far from that of low-alloy bolts, and it cannot be directly used to detect nickel-based alloy bolts after measuring the ultrasonic shear wave sound velocity and the probe K value on low-alloy bolts.
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[0034] The specification of nickel-based alloy bolts for the medium pressure main valve of a 1000WM ultra-supercritical generator set is M72×730mm. CTS-1008 ultrasonic flaw detector is selected, the probe frequency is 2.5MHz, the probe chip size is 13mm×13mm, and the probe K value is 2.
[0035] Through measurement, the front edge of the probe is 14mm. When the ultrasonic shear wave reflection amplitude at the second thread reaches the maximum value, the horizontal distance between the probe and the second thread of the bolt is 44mm. By measurement: the inner diameter of the center hole Φ 1 =19.90mm, polished rod diameterΦ 2 =52.56mm, thread diameter Φ 3 =72mm, thread depth h=4.24mm. The horizontal distance L from the incident point of the ultrasonic shear wave to the second thread is 58mm (the sum of the 14mm from the front of the probe and the 44mm horizontal distance from the probe to the second thread of the bolt).
[0036]
[0037] Adjust the speed of sound in the...
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Abstract
The invention discloses a method for measuring the ultrasonic shear wave sound velocity of nickel-based alloy bolts for main valve of ultra-supercritical generator sets. Next, move the oblique probe back and forth to make the reflected amplitude of the ultrasonic shear wave at the second thread reach the maximum value, measure the horizontal distance from the incident point of the ultrasonic shear wave to the second thread, and then calculate the actual sound of the ultrasonic shear wave propagation through the measurement parameters. Procedure. Finally, adjust the sound speed on the ultrasonic flaw detection instrument so that the displayed sound path is the same as the actual sound path. At this time, the sound speed is the ultrasonic shear wave sound speed of this type of nickel-based alloy bolts. Using the method, the ultrasonic shear wave sound velocity of nickel-base alloy bolts can be obtained only by measuring several parameters of nickel-base alloy bolts with a ruler, which saves a lot of cost, is simple and reliable, and can provide accurate sound velocity for ultrasonic shear wave inspection of nickel-base alloy bolts.
Description
technical field [0001] The invention relates to a method for measuring ultrasonic transverse wave sound velocity of a nickel-based alloy bolt used for a main valve of an ultra-supercritical generating set. Background technique [0002] With the vigorous development of ultra-supercritical generator sets, the temperature of the main steam valve and regulating valve of the steam turbine is as high as 600 ° C, so the conventional low-alloy bolts have been difficult to meet the requirements. At present, the main valves of the few ultra-supercritical generator sets operating in China basically use nickel-based alloy bolts with good high-temperature performance. Both ends of the nickel-based alloy bolt are threaded sections, the middle is an optical axis section, and the nickel-based alloy bolt is provided with a central hole. [0003] Generally, the bolts for the main valve of generator sets are made of low-alloy material. Because of the long application time and low cost, the bo...
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IPC IPC(8): G01N29/07
Inventor 代真卢建强严晓生林宝森郭境忠涂宏应陈骞
Owner 代真