Experimental analysis of piezomagnetic behaviour of ferromagnetic steels subjected to tensile stress

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• 作者：S. Bao ; Y. Gu ; S. Hu and H. Lou
• 刊名：Strain
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：53
• 期：1
• 全文大小：4157K
• ISSN：1475-1305

文摘

The purpose of this paper is to explore the correlation between the mechanical actions and the piezomagnetic field variations of ferromagnetic steels. The continuous examination of changes in the piezomagnetic behaviour was performed during tensile tests of Q235 and Q345 steels. The results obtained allowed the division of the magnetic behaviour of the investigated steels into four stages corresponding to four distinct loading stages. The piezomangtic fields demonstrate apparently different variation characteristics in different loading stages. Furthermore, the field intensity firstly reaches its extremum before the yield point. The variation of the ratio between the stress of the extreme point and the yield strength shows regular changes. The characteristics of the piezomagnetic responses are discussed in terms of the mechanical and microstructural condition of the steel. Additionally, a comparison of the piezomagnetic field variations in Q235 and Q345 steels demonstrates that the piezomagnetic properties are unique attributes of the material, which may result from the different chemical composition and microstructure of the two steels.