吴海平 李雄兵 宋永锋 司家勇 韩晓芹. In718晶粒尺寸对超声背散射信号的影响及其无损评价方法[J]. 金属学报, DOI: 10.11900/0412.1961.2015.0367.

摘要 相关文章 Metrics 全文: PDF(793 KB)   摘要: 制备晶粒尺寸不同的In718合金试样，采用经验模态分解(EMD)研究超声背散射信号的时频域特征，分析晶粒尺寸对不同频段固有模态函数(IMF)的影响，并探求各IMF信号的功率与晶粒尺寸之间的相关性。结果表明，原始背散射信号和IMF1信号的频带宽，受晶粒尺寸变化影响均不显著；IMF2信号频域分布较为集中，峰值频率的幅值随晶粒的增大而增大，其功率与晶粒尺寸相关系数达0.995，显著高于其它模态，EMD过程实质上滤除了与晶粒尺寸无关的成分。以充分反映晶粒散射强度的IMF2成分作为晶粒尺寸评价的特征信号，建立面向In718晶粒尺寸的超声背散射EMD评价模型。晶粒尺寸实测结果显示，本方法的灵敏度是传统背散射法的3.74倍；对两验证试样的评价误差分别为-3.72%和2.87%，精度显著高于声速法；与衰减法相比，本方法无需厚度信息，评价结果不受测厚误差的影响；此外，相比于金相法具有效率及无需破坏待测件的优势。 关键词 ： In718合金,  晶粒尺寸,  超声无损评价,  背散射信号,  经验模态分解,  固有模态函数     Abstract：Superalloy In718 enjoys wide application in such crucial parts as turbine engine disks due to high strength, great toughness and corrosion resistance in different temperature environment. Since the mechanical properties of superalloy In718 are greatly influenced by the grain size, a nondestructive detection method is studied in order to determine the grain size quickly and effectively. In this research, superalloy In718 test samples of different grain sizes were produced and the empirical mode decomposition (EMD) method was employed to find the characteristics of the time-frequency domain of the ultrasonic backscattering signals. Then the effects of the grain size over the intrinsic mode function (IMF) of different frequency bands was analyzed to seek the relations between the power and the grain size of the IMF signals. The original backscattering signals and IMF1 (the first IMF) signals barely respond to the change of the grain size because of their wide frequency bandwidths; the distribution of the frequency domain of the IMF2 signals is centralized and the amplitude of the peak frequency increases with the grain size, and the correlation coefficient between the power and the grain size is 0.995, much higher than that of other modes. This method eliminates the components irrelative to the grain size and takes the IMF2 components which fully reflect the intensity of the grain scattering as the characteristic signals of the grain size evaluation to build an ultrasonic backscattering EMD model evaluating the grain size of superalloy In718. The actual measurement results of the grain size show that the sensitivity of this method is 3.74 times the traditional backscattering method; the evaluation errors over the two verification test samples are -3.72% and 2.87%, apparently more accurate than the ultrasonic velocity method; compared with the attenuation method, this method requires no information of the thickness so that the evaluation results are independent of the thickness measuring error; compared with the metallographic method, this method is more efficient and requires no damage on the components to be evaluated. Key words： superalloy In718    grain size    ultrasonic nondestructive evaluation    backscattering signal    empirical mode decomposition    intrinsic mode function 收稿日期: 2015-07-10      ZTFLH:  TG115.21   基金资助:国家自然科学基金项目;国家高技术研究发展计划项目;中国博士后科学基金项目;中南大学创新训练项目 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 吴海平 李雄兵 宋永锋 司家勇 韩晓芹 44.8K 链接本文: https://www.ams.org.cn/CN/Y0/V/I/0 [1] 王洪瑛, 姚志浩, 李大禹, 郭婧, 姚凯俊, 董建新. 高 γ' 相含量粉末及变形高温合金组织和力学性能的异同性[J]. 金属学报, 2025, 61(9): 1364-1374. [2] 屈小波, 安金敏, 王林, 李喜. 汽车用齿轮钢16MnCrS5热处理变形机理[J]. 金属学报, 2025, 61(4): 597-607. [3] 李福林, 付锐, 白云瑞, 孟令超, 谭海兵, 钟燕, 田伟, 杜金辉, 田志凌. 初始晶粒尺寸和强化相对GH4096高温合金热变形行为和再结晶的影响[J]. 金属学报, 2023, 59(7): 855-870. [4] 原家华, 张秋红, 王金亮, 王灵禺, 王晨充, 徐伟. 磁场与晶粒尺寸协同作用对马氏体形核及变体选择的影响[J]. 金属学报, 2022, 58(12): 1570-1580. [5] 李晓倩, 王富国, 梁爱民. 喷涂工艺对Ta2O5原位复合钽基纳米晶涂层微观结构及摩擦磨损性能的影响[J]. 金属学报, 2021, 57(2): 237-246. [6] 张守清, 胡小锋, 杜瑜宾, 姜海昌, 庞辉勇, 戎利建. 海洋平台用Ni-Cr-Mo-B超厚钢板的截面效应[J]. 金属学报, 2020, 56(9): 1227-1238. [7] 许占一, 沙玉辉, 张芳, 章华兵, 李国保, 储双杰, 左良. 取向硅钢二次再结晶过程中的取向选择行为[J]. 金属学报, 2020, 56(8): 1067-1074. [8] 和淑文, 王鸣华, 白琴, 夏爽, 周邦新. WC-TiC-TaC-Co硬质合金中TaC含量对其显微组织和力学性能的影响[J]. 金属学报, 2020, 56(7): 1015-1024. [9] 华涵钰,谢君,舒德龙,侯桂臣,盛乃成,于金江,崔传勇,孙晓峰,周亦胄. W含量对一种高W镍基高温合金显微组织的影响[J]. 金属学报, 2020, 56(2): 161-170. [10] 李鑫,董月成,淡振华,常辉,方志刚,郭艳华. 等通道角挤压制备超细晶纯Ti的腐蚀性能研究[J]. 金属学报, 2019, 55(8): 967-975. [11] 梅益, 孙全龙, 喻丽华, 王传荣, 肖华强. 基于GA-ELM的铝合金压铸件晶粒尺寸预测[J]. 金属学报, 2017, 53(9): 1125-1132. [12] 张明, 刘国权, 胡本芙. 镍基粉末高温合金热加工变形过程中显微组织不稳定性对热塑性的影响[J]. 金属学报, 2017, 53(11): 1469-1477. [13] 付全,沙玉辉,和正华,雷蕃,张芳,左良. Fe81Ga19二元合金薄板的再结晶织构与磁致伸缩性能[J]. 金属学报, 2017, 53(1): 90-96. [14] 宋永锋, 李雄兵, 吴海平, 司家勇, 韩晓芹. In718晶粒尺寸对超声背散射信号的影响及其无损评价方法*[J]. 金属学报, 2016, 52(3): 378-384. [15] 刘觐,朱国辉. 超细晶粒钢中晶粒尺寸对塑性的影响模型*[J]. 金属学报, 2015, 51(7): 777-783. Viewed Full text Abstract Cited   Shared      Discussed