Materials Characterization

The effect of stress relief annealing temperature on the recovery of the magnetic properties deteriorated by strain and stresses introduced by shear cutting was analyzed in this study. Shear cut Epstein samples of grain oriented electrical steel were submitted to heat treatment at different temperatures (600-900°C). The magnetic properties were measured before and after annealing. The microstructures of the sheared edges before and after annealing were characterized using scanning electron microscope (SEM) equipped with electron backscattered diffraction (EBSD) in which it was possible to characterize the recovery and recrystallization processes responsible for the stored energy release in the shear cut region. The magnetic properties were improved with the increase of the annealing temperature due to recovery, recrystallization and the relief of residual stresses.

All the data is in originlab format.

Data for: Microstructure and magnetic properties of as-cast Ni2MnGa rods and tubes solidified by suction casting. Ni2MnGa cylinders and tubes are solidified in water chilled copper molds, a few millimeters in external diameter and five centimeters long, by the suction casting technique. At room temperature, all samples are in cubic austenitic phase. Microstructure and crystallographic texture of the as-cast rods and tubes are characterized by XRD, SEM, EBSD and TEM. Because of the heat extraction geometry samples exhibit a strong texture, with the [100] direction preferentially oriented in the radial direction, together with a random distribution on the long axis. This texture is more marked in the tubes. XRD and TEM results indicate that the major austenitic phase is fcc, with L21 order. A minority volume of the equilibrium B2´ disordered phase is detected by the presence of two close Curie temperatures in cylinders and tubes 2 mm in external diameter, but not when this diameter is near 1 mm. Precipitates of the stable compounds α-Mn(S,Se), with a NaCl-type structure, and monoclinic P4S5 are observed in all the samples. Cylinders and tubes in austenitic phase are magnetically soft. Hysteresis loops in martensitic phase exhibit local steps associated to a magnetization mechanism involving twin boundary displacement, indicating that a field-induced variant reordering takes place. The switching field Hsw, corresponding to the magnetization step observed, is identified as the field for which twin boundaries become mobile. The measured values of 0.37 T to 0.49 T are consistent with those corresponding to the onset of Type I twin boundaries displacement in 5M martensite, with an equivalent threshold stress of 1 MP.

This data and the MATLAB(R) functions correspond to the paper "Improvements on the recovery of 3D particle size distributions from 2D sections" by Benito, S; Cuervo, C; Pöhl, F; Theisen, W.

Figure 2 (b) AB sample ACOM-TEM Figure 4 (b) HIP sample ACOM-TEM Table 1 Hardness

Figure 2 (b) AB sample ACOM-TEM Figure 3 (a) EDX map raw data Figure 4 (b) HIP sample ACOM-TEM Figure 4 (f) EDX map raw data

These are original HRTEM images corresponding to Fig.8

These are original TEM images corresponding to Fig.5

EBSD raw data

Microstructural images of various steel microstructures (M1,2,3: martensite, P1,2: pearlite, LB: lower bainite) Square images (256px,128px,64px,32px). Complete objects and their binary masks (have been logically added to conduct the image texture analysis). image scales are 27.9nm/px for all images EXCEPT the low-resolution square images (128px=>55.8nm/px; 64px=>111.6nm/px; 32px=>223.2nm/px)