Effect of annealing temperature on microstructure and mechanical properties  of Fe-0.12C-4.85Mn-0.24Si steel for automobile back door panels

doi:10.13251/j.issn.0254-6051.2024.08.030

Abstract

Abstract: Effect of different temperatures annealing in the two-phase region on the microstructure and mechanical properties of Fe-0.12C-4.85Mn-0.24Si steel was studied using scanning electron microscopy, universal testing machine, X-ray diffraction instrument. The results show that with the increase of annealing temperature, the grain size of the Fe-0.12C-4.85Mn-0.24Si steel gradually increases, carbides gradually dissolve, and the volume fraction of austenite in the microstructure first increases and then decreases. The Fe-0.12C-4.85Mn-0.24Si steel annealed at 640 ℃ has the highest austenite volume fraction of 22.1%. As the annealing temperature increases, the tensile strength of the Fe-0.12C-4.85Mn-0.24Si steel gradually increases, and the product of elongation and strength first increases and then decreases. The elongation and product of strength and elongation of the Fe-0.12C-4.85Mn-0.24Si steel annealed at 640 ℃ are the highest, which are 30.4% and 28.47 GPa ·%, respectively.

Key words: Fe-0.12C-4.85Mn-0.24Si steel, annealing temperature, microstructure, mechanical properties

CLC Number:

TG156.94

Liang Ke, Wu Meng, Zhang Xiye, Xing Zhigang. Effect of annealing temperature on microstructure and mechanical properties of Fe-0.12C-4.85Mn-0.24Si steel for automobile back door panels[J]. Heat Treatment of Metals, 2024, 49(8): 174-177.

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Effect of annealing temperature on microstructure and mechanical properties of Fe-0.12C-4.85Mn-0.24Si steel for automobile back door panels

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