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基于瑞利波声弹性系数标定试验,采用一发一收瑞利波探头采集瑞利波信号,结合瑞利波信号分析探讨了热处理组织影响碳钢表层应力评价的机理。结果表明,随碳钢晶粒尺寸增大,瑞利波声弹性系数略有增大,瑞利波信号间时间差-载荷曲线的转折点载荷越接近试样弹性极限载荷,高载荷阶段瑞利波信号间时间差波动随载荷增大略有增大。分析认为,晶粒尺寸增大导致试样塑性变形能力下降、试样表面粗糙度及瑞利波探头与试样耦合质量是导致上述结果的重要原因。
Based on Rayleigh wave acoustic elastic modulus calibration experiment, Rayleigh wave signal was collected by one shot and one Rayleigh wave probe, and the mechanism of heat treatment on the surface stress evaluation of carbon steel was discussed with Rayleigh wave signal analysis. The results show that with the increase of the grain size of carbon steel, the acoustic elastic coefficient of Rayleigh wave increases slightly, and the turning point load of the time-difference curve of the Rayleigh wave signal is closer to the elastic limit load of the specimen. The Rayleigh wave signal The fluctuation of time difference slightly increases with the increase of load. The analysis shows that the increase of the grain size leads to the decrease of the plastic deformation capacity of the sample, the roughness of the sample surface and the coupling quality between the Rayleigh wave probe and the sample, which are the important reasons for the above results.