Stress detection of 12Cr1MoVG weld joints based on coercive force
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摘要:
矫顽力检测是一种应力无损检测技术,利用矫顽力与应力的关系,能够准确地评估材料内部的应力状态。基于力磁耦合理论,研究了在不同磁化方向下,12Cr1MoVG母材、12Cr1MoVG同种钢焊接接头和12Cr1MoVG/P91异种钢焊接接头不同区域矫顽力与应力的关系。试验结果表明,磁化方向平行于应力方向的矫顽力随着应力的增大先减小后增大；磁化方向垂直于应力方向的矫顽力随着应力的增大而增大；在拉伸过程中,12Cr1MoVG同种钢焊接接头的应力集中在母材区及热影响区；12Cr1MoVG/P91异种钢焊接接头的应力集中在12Cr1MoVG母材区及其热影响区。该研究结果为铁磁性材料的矫顽力检测提供了一定理论基础。
Abstract:Coercive force testing is a nondestructive testing technique for detecting stress, which utilizes the relationship between coercive force and stress to accurately evaluate the stress state inside a material. Based on the theory of force magnetic coupling, the relationship between the coercive force and stress at different positions of 12Cr1MoVG specimens, 12Cr1MoVG welded specimens of the same type of steels, and 12Cr1MoVG/P91 welded specimens of different types of steels under different magnetization directions was studied. The results showed that the coercive force which direction of magnetization parallels to the direction of stress decreased first and then increased with the increase of stress. The coercive force which the direction of magnetization perpendicular to the direction of stress increased with the increase of stress. During the stretching process, the stress of the 12Cr1MoVG welded specimens of the same type of steels was concentrated in the base metal zone and heat affected zone. The stress of the 12Cr1MoVG/P91 welded specimens of different types of steels was concentrated in the 12Cr1MoVG base metal zone and its heat affected zone. The research results provided theoretical basis for the detection of coercive force in ferromagnetic materials.
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Keywords:
- coercive force /
- direction of magnetization /
- magnetic domain /
- tensile stress
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