基于零蠕变特征空间投影的P91钢焊接接头蠕变超声检测

doi:10.3901/JME.2016.08.051

摘要/Abstract

摘要： 为提高P91钢焊接接头蠕变超声检测灵敏度,提出一种相对性的超声检测信号处理方法。该方法使用未发生蠕变的P91钢焊接接头的检测信号生成零蠕变特征空间,将任意检测信号向该空间投影,以投影残差能量与原信号总能量的比例表征检测目标偏离零蠕变状态的程度,比例越高,则表明蠕变损伤越严重。推导了该方法的一般性数学表达,并提出利用盲源分离算法实现该方法的线性化处理。利用不同蠕变程度的P91钢焊接接头试块对该方法进行了验证试验,结果表明,与常规超声方法相比,该方法具有更好的蠕变检测能力。由于该方法为相对性检测,零蠕变特征空间的完备性对检测结果的准确性具有较大影响。该方法以评价检测目标偏离标准特征空间的程度为核心,因此对其他损伤也具有检测能力。

关键词: 超声, 焊缝, 盲源分离, 蠕变

Abstract: In order to improve the detection sensitivity of ultrasonic inspection for creep in P91 weldments, a relative inspecting signal processing method is proposed. To apply this method, firstly a non-creep feature space should be generated from all the ultrasonic inspecting signals acquired from no creep specimens; then a residual vector can be calculated by projecting inspecting signal to the non-creep feature space; lastly the deviation ratio can be calculated by dividing the residual vector energy by signal energy. The deviation ratio reflects the distance between inspecting signal and non-creep feature space, higher deviation ratio means worse creep damage in the inspecting target. A general mathematic expression of the non-creep feature space projection method is deduced. For the convenience of signal processing, a simplified linearization algorithm based on blind source separation theory is suggested. To verify this new method, a testing experiment is conducted with P91 steel weldment specimens of different creep status. The results showed that, the new method provides higher sensitivity than usual ultrasonic method. As this method is a relative one, the accuracy of creep evaluation by the method depends on the completeness of non-creep feature space. In addition, as this method is based on evaluating the distance between inspecting target and no-defect feature space, it also can be used for detecting other types of defects.

Key words: blind source separation, creep, ultrasonic, weld

中图分类号:

TG115

原可义, 韩赞东, 陈以方, 钟约先. 基于零蠕变特征空间投影的P91钢焊接接头蠕变超声检测[J]. 机械工程学报, 2016, 52(8): 51-57.

YUAN Keyi, HAN Zandong, CHEN Yifang, ZHONG Yuexian. Ultrasonic Inspection for Creep in P91 Steel Weldments Based on Non-creep Feature Space Projection[J]. Journal of Mechanical Engineering, 2016, 52(8): 51-57.

参考文献

[1] TOUBOUL M, CREPIN J, ROUSSELIER G, et al. Identification of local viscoplastic properties in P91 welds from full field measurements at room temperature and 625 ℃[J]. Experimental Mechanics, 2013, 53(3)：455-468.
[2] MILOVIĆ L, VUHERER T, BLAČIĆ I, et al. Microstructures and mechanical properties of creep resistant steel for application at elevated temperatures[J]. Materials & Design, 2013, 46：660-667.
[3] DAS C R, ALBERT S K, BHADURI A K, et al. Understanding room temperature deformation behavior through indentation studies on modified 9Cr-1Mo steel weldments[J]. Materials Science and Engineering：A, 2012, 552：419-426.
[4] ESLAMI J, HOXHA D, GRGIC D. Estimation of the damage of a porous limestone using continuous wave velocity measurements during uniaxial creep tests[J]. Mechanics of Materials, 2012, 49：51-65.
[5] JAIN P, GODBOLE M. Review of magnetic hysteresis-based NDE of creep damage in power plant steels[J]. Insight - Non-Destructive Testing and Condition Monitoring, 2012, 54(3)：128-133.
[6] PRAJAPATI S, NAGY P B, CAWLEY P. Potential drop detection of creep damage in the vicinity of welds[J]. NDT & E International, 2012, 47：56-65.
[7] AUGUSTYNIAK B, CHMIELEWSKI M, SABLIK M J, et al. A new eddy current method for nondestructive testing of creep damage in austenitic boiler tubing[J]. Nondestructive Testing and Evaluation, 2009, 24(1-2)：121-141.
[8] GUPTA C, TODA H, SCHLACHER C, et al. Study of creep cavitation behavior in tempered martensitic steel using synchrotron micro-tomography and serial sectioning techniques[J]. Materials Science and Engineering：A, 2013, 564：525-538.
[9] PARKER J, COLEMAN K, SIEFERT J, et al. Challenges with NDE and weld repair of creep strength enhanced ferritic steels [J]. Advanced Materials & Processes, 2012, 170(10)：20-22.
[10] SPOSITO G, WARD C, CAWLEY P, et al. A review of non-destructive techniques for the detection of creep damage in power plant steels[J]. NDT & E International, 2010, 43(7)：555-567.
[11] KIM C, HYUN C, PARK I, et al. Ultrasonic characterization for directional coarsening in a nickel-based superalloy during creep exposure[J]. Journal of Nuclear Science and Technology, 2012, 49(4)：366-372.
[12] HATANAKA H, IDO N, ITO T, et al. Ultrasonic creep damage detection by frequency analysis for boiler piping[J]. Journal of Pressure Vessel Technology, 2007, 129(4)：713.
[13] SZELĄŻEK J, MACKIEWICZ S, KOWALEWSKI Z L. New samples with artificial voids for ultrasonic investigation of material damage due to creep[J]. NDT & E International, 2009, 42(2)：150-156.
[14] GYEKENYESI A L, KAUTZ H E, SHANNON R E. Quantifying creep damage in a metallic alloy using acousto-ultrasonics[J]. Journal of Materials Engineering and Performance, 2002, 11(2)：205-210.
[15] 李志农, 张芬, 肖尧先. 基于 CVA-ICA 的机械故障源动态盲分离方法[J]. 机械工程学报, 2015, 51(12)：24-29. LI Zhinong, ZHANG Fen, XIAO Yaoxian. Dynamic blind separation of mechanical fault sources based on canonical variate analysis and independent component analysis[J]. Journal of Mechanical Engineering, 2015, 51(12)：24-29.
[16] 张杰, 张周锁, 朱冠汶, 等. 多元消减约束独立分量分析及其在振源贡菲量计算中的应用[J]. 机械工程学报, 2014, 50(5)：57-64. ZHANG Jie, ZHANG Zhousuo, ZHU Guanwen, et al. Multi-unit deflation constraint independent component analysis and its application to source contribution estimation[J]. Journal of Mechanical Engineering, 2014, 50(5)：57-64.
[17] 余先川, 胡丹. 盲源分离理论与应用[M]. 北京：科学出版社, 2011. YU Xianchuan, HU Dan. Theory and application of blind source separation[M]. Beijing：Science Press, 2011.
[18] WANG Junfeng, SHI Tielin, HE Lingsong, et al. Frequency overlapped signal identification using blind source separation[J]. Chinese Journal of Mechanical Engineering, 2006, 19(2)：286-289.