Laser Shock Processing influence on local properties and overall tensile behavior of friction stir welded joints

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• 作者：Mihaela Iordachescu^a ; ^{miordachescu@mater.upm.es} ; André ; s Valiente^a ; ^{avaliente@mater.upm.es} ; Luis Caballero^a ; ^{lcaballero@mater.upm.es} ; Danut Iordachescu^b ; ^{danut.iordachescu@upm.es} ; José ; Luis Ocañ ; a^b ; ^{jlocana@etsii.upm.es} ; Juan Antonio Porro^b ; ^{japorro@etsii.upm.es}
• 关键词：Laser Shock Processing ; Friction Stir Welding ; Microstructure ; Strain ; Stress ; Video Image Correlation
• 刊名：Surface and Coatings Technology
• 出版年：2012
• 出版时间：15 January 2012
• 年：2012
• 卷：206
• 期：8-9
• 页码：2422-2429
• 全文大小：1840 K

文摘

Based on laser beam intensities above 10⁹ W/cm² with pulse energy of several Joules and duration of nanoseconds, Laser Shock Processing (LSP) is capable of inducing a surface compressive residual stress field. The paper presents experimental results showing the ability of LSP to improve the mechanical strength and cracking resistance of AA2024-T351 friction stir welded (FSW) joints. After introducing the FSW and LSP procedures, the results of microstructural analysis and micro-hardness are discussed. Video Image Correlation was used to measure the displacement and strain fields produced during tensile testing of flat specimens; the local and overall tensile behavior of native FSW joints vs. LSP treated were analyzed. Further, results of slow strain rate tensile testing of the FSW joints, native and LSP treated, performed in 3.5 % NaCl solution are presented. The ability of LSP to improve the structural behavior of the FSW joints is underscored.