Magnetic properties of eutectoid steel with different perlite morphology
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Data has devoted to the magnetic properties of eutectoid steel with different pearlite morphology as well as x-ray diffraction analysis results. Here you can find the raw data received by the Remagraph C-500 instrument, laboratory setup, designed in the Institute of Metall Physics of UB RAS, and PANalytical Empyrean Series 2 high-resolution diffractometer with Cu-Kα radiation.
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The experiments were carried out on samples of eutectoid steel with the chemical composition (by weight percent) 0.75-0.84 C; 0.17-0.33 Si; < 0.03 P; < 0.028 S; < 0.2 Cr; < 0.25 Ni, and < 0.25 Ni. The samples were bars 250 mm long with a 2 x 8 mm2 cross-section. The samples obtained the structures of nodular and coarse-lamellar (hereinafter, lamellar) pearlite. The samples were plastically deformed step-by-step by tension. Tensile tests were performed at room temperature at a strain rate of 2 mm / min with an Instron 5982 machine. The sample elongation was measured after each test. Additionally, Young's moduli were determined. Measurements of the magnetic properties (coercivity Hc, remanence Br, maximum magnetic permeability μmax) were carried out at room temperature on a Remagraph C-500 setup. The test sample with the exciting and measuring coils preliminarily placed in its central part was fixed in the middle of the solenoid. A triangular signal with a frequency of 5 mHz, which provided a field remagnetizing along the limiting hysteresis loop up to 360 A / cm, was formed by a programmable current source. A sinusoidal signal with a frequency of 30 Hz was fed to the exciting coil. The amplitude of the 30 Hz magnetic field of the exciting coil was much less than the amplitude of the 5 mHz magnetic field of the solenoid. The measuring-coil signal U~(H), proportional to the reversible magnetic permeability, was fed to the lock-in amplifier and then converted by ADC. The measured dependences U~(H) were mathematically processed to determine fields of displacement of the 90-degree domain walls and in this way estimate residual stresses. More details about the methods of mathematical processing were given in [1,2]. The curve-subtraction method was used in this study to find displacement fields for the 90-degree domain walls. The U~(H) curves for undeformed samples were taken as the initial ones. X-ray diffraction investigations were carried out on a PANalytical Empyrean Series 2 high-resolution diffractometer with Cu-Kα radiation in the angular range 2θ = (35−125)○ with a scanning step of 0.013○. X-ray phase analysis was performed using the HighScore Plus software. Residual stresses of the first order (macro-stresses) in the surface layer of the sample were calculated by the slope method (sin2ψ) using the PANalytical Stress software. [1] A.N. Stashkov, V.G. Kuleev, E.A. Schapova, A.P. Nichipuruk, Studying Field Dependence of Reversible Magnetic Permeability in Plastically Deformed Low-Carbon Steels, Russian journal of nondestructive testing. 54 (2018) 855-861. DOI: 10.1134/S1061830918120094. [2] A. Stashkov, A. Nichipuruk, V. Kuleev and E. Schapova, Magnetic non-destructive testing of residual stresses in low carbon steels, Journal of Physics: Conference Series. 1389 (2019) 012032. doi:10.1088/1742-6596/1389/1/012032.