Non-destructive evaluation of gradient properties of hardened steel by surface acoustic waves measurements
Non-destructive evaluation of gradient properties of hardened steel by surface acoustic waves measurements
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DOI：
10.1063/1.1472988
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发表时间：
2002-05
期刊：
影响因子：
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通讯作者：
B. Chenni;J. Pouliquen
中科院分区：
文献类型：
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作者：
B. Chenni;J. Pouliquen
采用基于刀口技术的表面声波绝对测量方法，实现了淬硬钢表面速度弥散的测量。SAW通过数字间换能器（钛酸钡、石英或铌酸锂）产生并传输到表面样品。在这个表面上发射的激光束被SAW产生的波纹所偏转，光束的偏转由前面有一把刀的光电倍增管检测到。钢样品采用双介质系统（层-基）建模。对不同厚度的表层（扰动钢）进行了瑞利波速频散的数值计算。对某一特定的表层厚度，测量和计算结果吻合得很好。通过在样品的另一个表面上进行类似的测量，证实了这一值，该表面先前沉积了21 μm的铬层。该表面由三介质系统（铬-微扰钢-块状钢）模拟。
Measurements of velocity dispersion on hardened steel were achieved by means of an absolute method for surface acoustic waves (SAW) based on the Knife-edge technique. SAW are generated and transmitted to the surface sample by interdigital transducers (barium titanate, quartz or lithium niobate). A laser beam sent on this surface is deflected by the ripple produced on it by the SAW and the deviation of the beam is detected by a photomultiplier with a knife in front of it. The steel sample is modelled by a two media system (layer-substrate). Numerical calculations of the Rayleigh wave velocity dispersion are achieved for various thickness values of the surface layer (perturbed steel). Measurements and calculations agree well for a particular value of the surface layer thickness. A confirmation of this value is obtained by similar measurements on the other face of the sample on which a chromium layer of 21 μm was previously deposited. This face is modelled by a 3 media system (Chromium-perturbed steel-bulk s...