| Citation: | MEN Ping, DONG Shiyun, YAN Shixing, et al. Influence of heat treatment and measurement methods on material hardness evaluation by longitudinal wave velocity[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(11): 2312-2320. doi: 10.13700/j.bh.1001-5965.2018.0086(in Chinese)
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Hardness is one of the important indexes of mechanical performance of materials, and employing ultrasonic nondestructive testing method for hardness evaluation faces many challenges now. In this paper, through setting up high-precision ultrasonic wave transmission time measurement system, the longitudinal wave propagation time in the thickness direction of different heat treated 45 steel specimens was measured by pulse reflected echo method, and the longitudinal wave velocity was calculated. Simultaneously, the gate signal measurement methods were changed, and the effects of different heat treatment and gate signal measurement methods on hardness evaluation by the longitudinal wave velocity were studied.On this basis, the mapping relationship among material hardness, microstructure and longitudinal wave velocity was obtained, and the calibration model for evaluating the hardness of 45 steel specimens by longitudinal wave velocity was established and verified. The hardness prediction error by the calibration model meets the error requirement of 10% for engineering application.
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