Mechanism of Residual Stress Reduction in Low Alloy Steel by a Low Frequency Alternating Magnetic Treatment  

作　　者：Yanli Song Lin Hua 

机构地区：[1]School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Journal of Materials Science & Technology》2012年第9期803-808,共6页材料科学技术（英文版）

基　　金：funded by the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of Ministry of Education, China (No.[2002]383);the Science and Technology Planning Project of Wuhan City, China (No.20067003111-05)

摘　　要：Residual stress reduction in low alloy steel by a low frequency alternating magnetic treatment and its mechanism were investigated. Experimental results revealed that average stress reductions of 20%-24% were obtained in the welded samples. Moreover, compared with the zones with lower initial stress levels, more remarkable stress reductions were obtained in the stress concentration zones. The microstructures and magnetic domains were observed by scanning electron microscopy （SEM） and atomic force microscopy （AFM）. Based on the analysis of the microstructure and magnetic domain changes, the mechanism of stress reduction by the magnetic treatment has been concluded： （1） the magneto-plastic deformations mainly due to the more uniform redistribution of dislocations are the fundamental cause of stress relaxation; and （2） surface topography is also proved to affect the magnetic treatment results to some degree by influencing magnetic domains.Residual stress reduction in low alloy steel by a low frequency alternating magnetic treatment and its mechanism were investigated. Experimental results revealed that average stress reductions of 20%-24% were obtained in the welded samples. Moreover, compared with the zones with lower initial stress levels, more remarkable stress reductions were obtained in the stress concentration zones. The microstructures and magnetic domains were observed by scanning electron microscopy （SEM） and atomic force microscopy （AFM）. Based on the analysis of the microstructure and magnetic domain changes, the mechanism of stress reduction by the magnetic treatment has been concluded： （1） the magneto-plastic deformations mainly due to the more uniform redistribution of dislocations are the fundamental cause of stress relaxation; and （2） surface topography is also proved to affect the magnetic treatment results to some degree by influencing magnetic domains.

关 键 词：Magnetic treatment Residual stress reduction Magneto-plastic deformations Surface topography 

分 类 号：TG404[金属学及工艺—焊接] TE869[石油与天然气工程—油气储运工程]