Formation mechanism of κ-carbide in FeMnAlC low density steel

doi:10.13251/j.issn.0254-6051.2021.12.001

Abstract

Abstract: FeMnAlC steel is a new type of high strength and low density steel. The high content of alloying elements makes the microstructure and properties of the FeMnAlC steel have a large regulatory space. κ-carbide is a unique precipitated phase in the steel, and its precipitation position and size have a great influence on the properties of the FeMnAlC steel. Reasonable regulation of κ-carbide precipitation can effectively improve the strength of the steel, and with high plasticity and toughness. The formation mechanism of κ-carbide in the FeMnAlC steel was summarized, and the morphology characteristics and control methods of κ-carbide were explored by combining different cooling rates and short-term aging tests.The results show that the κ-carbide is generated by spinodal decomposition, and the structure is coherent with the matrix, which will coarsen with the extension of aging time and the increase of temperature. Si and Ni elements will promote the precipitation of κ-carbide, and Mo, Cr and other elements will inhibit the precipitation of κ-carbide.

Key words: κ-carbide, FeMnAlC steel, low density steel, spinodal decomposition, ordering

CLC Number:

TG142.1

Cao Chenxing, Wang Cunyu, Cao Wenquan. Formation mechanism of κ-carbide in FeMnAlC low density steel[J]. Heat Treatment of Metals, 2021, 46(12): 1-6.

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