新聞資訊
In718晶粒尺寸對超聲背散射信號的影響及其無損評價方法
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-18
制備晶粒尺寸不同的In718合金試樣, 采用經驗模態分解(EMD)研究超聲背散射信號的時頻域特征, 分析晶粒尺寸對不同頻段固有模態函數(IMF)的影響, 并探求各IMF信號的功率與晶粒尺寸之間的相關性.
In718晶粒尺寸對超聲背散射信號的影響及其無損評價方法EFFECTS OF IN718 GRAIN SIZE ON ULTRASONIC BACKSCATTING?SIGNALS AND ITS NONDESTRUCTIVE EVALUATION METHOD?
制備晶粒尺寸不同的 In718 合金試樣, 采用經驗模態分解(EMD)研究超聲背散射信號的時頻域特征,?分析晶粒尺寸對不同頻段固有模態函數(IMF)的影響, 并探求各 IMF 信號的功率與晶粒尺寸之間的相關性.?結果表明, 原始背散射信號和 IMF1 信號的頻帶寬, 受晶粒尺寸變化影響均不顯著; IMF2 信號頻域分布較為集中, 峰值頻率的幅值隨晶粒的增大而增大, 其功率與晶粒尺寸相關系數達 0.995, 顯著高于其它模態,?EMD 過程實質上濾除了與晶粒尺寸無關的成分. 以充分反映晶粒散射強度的 IMF2 成分作為晶粒尺寸評價的特征信號, 建立面向 In718 晶粒尺寸的超聲背散射 EMD 評價模型. 晶粒尺寸實測結果顯示, 本方法的靈敏度是傳統背散射法的 3.7 倍; 對 2 個驗證試樣的評價誤差分別為-3.72%和 2.87%, 精度顯著高于聲速法;?與衰減法相比, 本方法無需厚度信息, 評價結果不受測厚誤差的影響; 此外, 相比于金相法具有效率及無需破壞待測件的優勢.?
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 work, superalloy In718 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 were analyzed to seek the relations?between the grain size and the power 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 3.7 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.
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AILIAI has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. AILIAI develops the best alloy material solutions for current and future challenges.
獲取更多我們供應的合金和服務信息，請致電086-021-67660801或發電子郵件kefu@ailiaigroup.com聯系我們，您也可以通過微博和微信和我們互動。
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