Mechanism study of the residual stress evaluation of low-carbon steels using the eddy current magnetic signature method

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:538

Article

Takeda, Sho¹  Uchimoto, Tetsuya^1,2  Kita, Aoba^1,3  Matsumoto, Takanori^1,3  Sasaki, Toshihiko⁴ 

[1] Tohoku Univ, Inst Fluid Sci, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, ELyTMaX UMI 3757, CNRS Univ Lyon Tohoku Univ Int Joint Unit, Sendai, Miyagi 9808577, Japan

[3] Tohoku Univ, Grad Sch Engn, Dept Mech Syst Engn, Aoba Ku, 6-6 Aramaki Aza Aoba, Sendai, Miyagi 9808579, Japan

[4] Kanazawa Univ, Kakuma Machi, Kanazawa, Ishikawa 9201192, Japan

关键词: Magnetic non-destructive evaluation;    Eddy current magnetic signature;    Magnetic incremental permeability;    X-ray stress measurement method;    Low-carbon steel;    Ferrite;    Pearlite;   

DOI  :  10.1016/j.jmmm.2021.168268

来源: Elsevier

【 摘 要 】

The eddy current magnetic signature (EC-MS) method is a relatively new method used to evaluate the residual stresses of ferromagnetic steels with higher sensitivity than other magnetic techniques. In this study, the effects of mechanical polishing and the ferrite-pearlite structure on the shape of the EC-MS signal were investigated in two experiments to clarify the effect of compressive residual stress on the EC-MS signal shape. In the first experiment, the work-hardened layers of the specimens were removed by electrolytic polishing and the EC-MS signals of the specimens were investigated. The second experiment involved the EC-MS measurements of materials with different pearlite contents, i.e., low-carbon steel with 0.17% and 0.27% carbon and pure iron. Specimens with different residual strains were prepared using a tensile test apparatus and their EC-MS signals were compared. In both experiments, the residual stresses acting on the specimens were measured adopting X-ray diffraction. The results reveal that the non-anisotropic compressive residual stress acting on the specimen surface changed the EC-MS signal in an anti-clockwise manner while the unidirectional compressive residual stress inside the specimen changed the EC-MS signal in a clockwise manner.

【 授权许可】

Free