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基于声发射技术的锆合金微弧氧化涂层拉伸失效监测
          
Tensile Failure Monitoring of Zirconium Alloy Micro-arc Oxidation CoatingBased on Acoustic Emission Technology

摘    要
通过恒压微弧氧化设备在锆合金基体表面制备了微弧氧化涂层,运用声发射技术对涂层试样的拉伸过程进行实时监测,通过声发射特征参数的分析与拉伸断口形貌的观察,研究了涂层试样的拉伸失效过程,并运用快速傅里叶变换识别了涂层拉伸失效的频率特征。结果表明:微弧氧化涂层对锆合金拉伸性能的影响主要表现在拉伸过程中的塑性阶段;在拉伸过程中,涂层中的微裂纹随机向各个方向扩展,导致涂层在塑性阶段(132~222 s)发生集中性剥离脱落现象,且试样断裂前涂层已基本从基体上脱落,仅在断口的局部区域零星分布一些不规则形状的涂层;涂层拉伸失效的频率特征是在0.023,0.039,0.055 MHz处出现了3个强烈的信号,并在大于0.8 MHz的频段中出现微弱的稳定信号。
标    签 锆合金   微弧氧化   拉伸失效   声发射技术   涂层   zirconium alloy   micro-arc oxidation   tensile failure   acoustic emission technology   coating  
 
Abstract
The micro-arc oxidation coating was prepared on the surface of zirconium alloy substrate by the constant pressure micro-arc oxidation equipment. The tensile process of the coating sample was monitored in real time by acoustic emission technology. The tensile failure process of the coating sample was studied by analysis of acoustic emission characteristic parameters and observation of tensile fracture morphology, and the frequency characteristics of the coating tensile failure were identified by fast Fourier transform. The results show that micro-arc oxidation coating mainly affected the tensile properties of zirconium alloy at the plastic stage. During the tensile process, the microcracks in the coating randomly extended in all directions, leading to the phenomenon of concentrated peeling of the coating at the plastic stage (132-222 s); the coating was basically detached from the substrate before fracture, and only some irregular coating was scattered in the local area of the fracture. The frequency characteristics of coating tensile failure were three strong signal at 0.023, 0.039, 0.055 MHz, and weak stable signal in the frequency band greater than 0.8 MHz.

中图分类号 TG410.20   DOI 10.11973/jxgccl202206012

 
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所属栏目 专题报道(金属材料表面处理)

基金项目 国家自然科学基金资助项目(U2067221);四川省科技计划项目(2022JDJQ0019)

收稿日期 2021/4/20

修改稿日期 2022/4/27

网络出版日期

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备注周腾(1988-),男,浙江诸暨人,博士研究生导师:蔡振兵研究员

引用该论文: ZHOU Teng,CHEN Huan,LI Zhengyang,YUE Yanan,ZHANG Ruiqian,CAI Zhenbing. Tensile Failure Monitoring of Zirconium Alloy Micro-arc Oxidation CoatingBased on Acoustic Emission Technology[J]. Materials for mechancial engineering, 2022, 46(6): 71~77
周腾,陈寰,李正阳,岳雅楠,张瑞谦,蔡振兵. 基于声发射技术的锆合金微弧氧化涂层拉伸失效监测[J]. 机械工程材料, 2022, 46(6): 71~77


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