Characterization of Welding Induced Anisotropy in Steel by Magnetic Barkhausen Noise
Characterization of Welding Induced Anisotropy in Steel by Magnetic Barkhausen Noise作者机构：Department of Materials Science and Engineering Faculty of Engineering University of Misurata Misurata Libya Design Unit School of Mechanical and Systems Engineering University of Newcastle Newcastle upon Tyne NE I 7R U United Kingdom
出 版 物：《Journal of Mechanics Engineering and Automation》 (机械工程与自动化（英文版）)
年 卷 期：2013年第3卷第12期
页 面：756-763页
学科分类：080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
主 题：巴克豪森噪声 焊接方向 各向异性 船用钢板 表征 焊接热影响区 残余应力分布 应力集中区
摘 要：Residual stress continues to be important issues in shipbuilding. This paper demonstrates how the heat affected zone that results from welding could be identified nondestructively using MBN (magnetic Barkhausen noise) technique. A stress concentration region was created by placing a weld bead on a marine steel plate used in ship construction. MBN measurements were made on the back surface of the welded plate along the weld direction and perpendicular to it in a line that crosses the weld bead. The stress distribution as deduced from the MBN measurements was found to be anisotropic in the material of the heat affected zone. The heat induced anisotropy was completely eliminated by shot peening the HAZ material as revealed by MBN intensity. It was concluded that the directional MBN measurements could be used to characterize the induced anisotropy and hence assess the thermal residual stresses distribution near a localized stresses concentration regions imposed by welding.
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