增材制造钛合金壳体表面微裂纹缺陷检测研究

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中图分类号：TP391.4 文献标志码：A

Detection of surface microcrack defects in additively manufactured titanium alloy shell surfaces

WANG Yuan，HAN Shiping，YANG Jing， HUANG Zaiheng （School of Automotive and Mechanical Engineering，Lu'an Vocational Technical College， Lu'an 237158，China）

Abstract：To effectively enhance the quality of additively manufactured titanium alloy shels，this study proposes a detection method for shell surface microcrack defects.First，the surface image of additively manufactured titanium aloy shells is decomposed into low-frequency and high-frequency components via wavelet decomposition.Anoptimized bilateral filtering Retinex method andan improved threshold function are applied to the low-frequencyand high-frequencycomponents，respectively.Theenhanced image is then reconstructed using the inverse discrete wavelet transform. Second，texture features and features based on the gray-gradient co-occurrence matrix （GGCM） derived from the local binary pattern （LBP）are extracted from the shell surface image.Finally，principal component analysis is employed for feature dimensionality reduction， anda support vector machine （SVM） is integrated to achieve accurate identification of shell surface microcrack defects.Experimental results demonstrate that the proposed method can precisely detect surface microcrack defects in additively manufactured titanium alloy shells.

Keywords：additive manufacturing；shell surface;microcrack defect；detection

钛合金因具备卓越的力学性能、耐腐蚀性以及优异的生物适应性，在航空航天与医疗健康等诸多领域获得了广泛的应用。（剩余7656字）