Influence of stress on the stray field signals of ferromagnetic materials  

作　　者：Lihong Dong Binshi Xu Shiyun Dong Qunzhi Chen Dan Wang 

机构地区：[1]National Key Laboratory for Remanufacturing, Armored Force Engineering Institute, Beijng 100072, China [2]Department of Basic Course, Ordnance Engineering College, Shijiazhuang 050003, China [3]Beijing Aeronautical Technology Research Center, Beijing 100076, China

出　　处：《Journal of University of Science and Technology Beijing》2008年第5期580-584,共5页北京科技大学学报（英文版）

基　　金：the National Natural Science Foundation of China (No 50235030 and No 50505052)

摘　　要：To investigate the influence of stress alone on the stray field signals of ferromagnetic materials,the static tensile tests of 0.45%C steel and 45CrNiMoVA steel flat-shaped specimens were performed on an MTS810 hydraulic testing machine. Hp（y） signals,the normal component of spontaneous stray field,were measured during the testing process by an EMS-2003 metal magnetic memory diagnostic apparatus cooperated with a non-magnetic electric control displacement instrument. Fracture and microstructure were observed by a scanning electronic microscope and a transmission electron microscope,respectively. The relationships between axial applied stress or residual stress measured by X-ray diffraction method and Hp（y） were analyzed. The results indicate that some regular pattern of the magnetic curve is displayed only between applied stress and stray field signals. The magnetic ordering process stops due to dislocation pinning magnetic domain structure,and Hp（y） value unvaried nearly with applied load increasing in the plastic deformation stage.To investigate the influence of stress alone on the stray field signals of ferromagnetic materials,the static tensile tests of 0.45%C steel and 45CrNiMoVA steel flat-shaped specimens were performed on an MTS810 hydraulic testing machine. Hp（y） signals,the normal component of spontaneous stray field,were measured during the testing process by an EMS-2003 metal magnetic memory diagnostic apparatus cooperated with a non-magnetic electric control displacement instrument. Fracture and microstructure were observed by a scanning electronic microscope and a transmission electron microscope,respectively. The relationships between axial applied stress or residual stress measured by X-ray diffraction method and Hp（y） were analyzed. The results indicate that some regular pattern of the magnetic curve is displayed only between applied stress and stray field signals. The magnetic ordering process stops due to dislocation pinning magnetic domain structure,and Hp（y） value unvaried nearly with applied load increasing in the plastic deformation stage.

关 键 词：stray field metal magnetic memory applied stress residual stress FRACTURE microstructure 

分 类 号：TG143[一般工业技术—材料科学与工程]