Quantitative study on secondary phase precipitation of rare earth cold-rolled sheet during annealing in CSP process

doi:10.13251/j.issn.0254-6051.2020.01.034

Abstract

Abstract: Precipitation behavior of the secondary phases of rare earth cold-rolled sheet during annealing based on CSP process was studied. The 685 ℃×9 h annealing process of an enterprise was simulated. The change of microstructure and macroscopic texture before and after annealing ere analyzed by means of optical microscope and X-ray diffractometer. The secondary phase particles were extracted from the experimental steel by non-aqueous electrolysis separation method and the secondary phases were analyzed by X-ray diffractometer. The chemical method was used to quantitatively analyze the change of the secondary phases precipitation during the annealing process of the steel and the precipitation behavior of the secondary phases were analyzed by the precipitation kinetics calculation. The results indicate that after the annealing process, the grains of the steel are transformed from a typical fibrous cold-rolled microstructure to a recrystallized cake-shaped grain and non-{111} textures are weakened while {111} textures enhanced. The secondary phases in the steel are mainly MnS, Fe ₃ C and AlN types. In the scope of this experiment, MnS hardly precipitates during the annealing process. Fe ₃ C mainly precipitates during the room temperature to 570 ℃. AlN precipitates continuously with the annealing temperature increasing, and precipitates fastest at about 685 ℃.

Key words: CSP process, rare earth cold-rolled sheet, batch annealing, secondary phases precipitation

CLC Number:

TG142.1

Guo Chunyan, Liu Yubao, Gao Rizeng, Lü Weidong. Quantitative study on secondary phase precipitation of rare earth cold-rolled sheet during annealing in CSP process[J]. HTM, 2020, 45(1): 170-173.

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