Influence of Microstructure and Residual Stress on Surface Stress Measurement of Laser Cladding Layer by Rayleigh Wave

doi:10.3901/JME.2015.24.050

Abstract

Abstract: Rayleigh wave is employed to evaluate surface stress of laser cladding coating, combined with static load tensile test, acoustoelastic relation curve of Rayleigh wave propagating in Fe314 laser cladding layer is established; By fitting the acoustoelastic relation curve, laser cladding material acoustoelastic coefficient are calibrated and the acoustoelastic formula is established based on this. The experimental results indicate that the acoustoelastic formula can be used to evaluate surface stress of laser cladded coatings. Then it analyzes effects of microstructure and residual stress of the laser cladded coating on surface stress experimental values, which shows the effects are significant. The experimental results are close to the actual load after being calibrated by the initial stress from acoustoelastic formula calculation. Due to the inhomogeneous deformation of anisotropic laser cladding layer during tensile process, the error of high stress stage is significantly greater than that of low stress phase when Rayleigh wave is employed to detect surface stress of Fe314 laser cladding layer.

Key words: laser cladding coating, microstructure, Rayleigh wave, stress

DONG Shiyun, YAN Xiaoling, XU Binshi. Influence of Microstructure and Residual Stress on Surface Stress Measurement of Laser Cladding Layer by Rayleigh Wave[J]. Journal of Mechanical Engineering, 2015, 51(24): 50-56.

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