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Effect of Rolling and Recrystallization Process on Microstructure and Magnetic Properties of Fe-Cr-Co Alloy

Author: HanZhiYu
Tutor: ZhenLiang
School: Harbin Institute of Technology
Course: Materials Science
Keywords: Fe-Cr-Co alloy cold-rolling recrystallization microstructure texture magnetic properties
CLC: TG132.2
Type: Master's thesis
Year: 2009
Downloads: 21
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Abstract


Microstructure and magnetic properties of Fe-25Cr-15Co-3Mo alloys and Fe-25Cr-12Co-1Si alloy at different rolling and recrystallization process were systemly studied. The microstructure change of the Fe-Cr-Co alloy in different cold-rolled and annealed process were studied by optical microscopy and TEM. The cold-rolled and the recrystallization texture were analyzed by XRD and EBSD. The effects of cold-rolling reduction, annealing temperature and holding time on magnetic properties of alloy were systematicly studied through cold-rolled and annealed technological experiments and the magnetic property measurements.Microstructure observation shows that the effects of cold-rolling reduction on cold-rolled structure and recrystallization structure of Fe-Cr-Co alloy is great. With the increasing of the cold-rolling reduction, the crystal grain elongated and the content of fibrous structure increased. After the annealing process, the cold-rolling grain get back to the equiaxed grain with the size average. When the alloy was heat treated for magnetic hardening after cold-rolling, the spinodal decomposition microstructure was isotropic. When the annealing process were add after the cold-rolling and before the heat treating for magnetic hardening, the growth ofα1 phase particles tends to along the direction of the external magnetic field, which is similar with the original alloy.XRD results showed that, after cold-rolled and annealing process, the phase of Fe-Cr-Co alloy remains singleαphase. Certain orientation texture can be found in the alloy through the different rolling deformation, and after the annealed process texture basically eliminated. EBSD results showed that, Fe-25Cr-15Co-3Mo alloy rolled after a short-time annealing process can save a certain degree of orientation texture. The cube texture were found in alloy with 40% deformation, and {100}<001><011> texture were found in alloy with 70% deformation.Test results show that the magnetic properties are obviously below the original magnetic properties without annealing process after cold-rolling. With annealing process after cold-rolling, the magnetic properties recovery to the original valuation. During the short-time annealing process, the coercive force quickly achievement the original valuation and then increase slowly. With the increasing of the cold-rolling reduction, the coercive force without annealing process reduced and the one with annealing process increase in Fe-25Cr-15Co-3Mo alloy, that is defferent from the Fe-25Cr-12Co-1Si alloy whose coercive force have no obvious change with the cold-rolling reduction.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Special physical properties of alloys > Special electromagnetic properties of alloy
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