Sun Ao,Yang Bo,Fu Qingcai,et al.The Effect of Al Content on the Phase Transformation Behavior and Microstructure and Mechanical Properties of Corrosion-resistant Steel[J].Special Steel,2026,47(01):112-119.
Sun Ao,Yang Bo,Fu Qingcai,et al.The Effect of Al Content on the Phase Transformation Behavior and Microstructure and Mechanical Properties of Corrosion-resistant Steel[J].Special Steel,2026,47(01):112-119.DOI: 10.20057/j.1003-8620.2025-00053.
The Effect of Al Content on the Phase Transformation Behavior and Microstructure and Mechanical Properties of Corrosion-resistant Steel
The effect of different Al contents on the phase transformation behavior, microstructure and mechanical properties of corrosion resistant steel were studied by using Thermo-Calc thermodynamic calculation software, scanning electron microscopy and tensile testing machine. And the corrosion resistance of experimental steels with different Al contents was studied and analyzed through electrochemical corrosion experiment and immersion corrosion test.The results show that when the Al content in
w
[Al] increases from 0.5% to 1%, the range of ferrite and austenite two-phase zone in experimental steel decreases, the austenite formation temperature drops from 1 450 ℃to1 430 ℃, and the precipitation temperature of cementite increase fro
m 760 ℃ to 770 ℃. The increase of Al content has a significant effect on the ferrite phase, but has little effect on the precipitation phase in steel.The increase of Al content is conducive to the formation of ferrite phase in the structure. Although the increase of Al content will increase the tendency of grain coarsening in the steel and slightly reduce the strength, it can improve the plasticity and low temperature impact toughness of the steel, especially for improving the impact toughness of the steel. The increase of Al content not only contributes to the positive shift of corrosion potential, decreases the corrosion current density of steel,but also reduces the corrosion rate of test steel.With the increase of Al content, the density of test steel and the proportion of protective α-FeOOH in the rust layer are improved, which hinders the further penetration of corrosive medium (Cl
-
) and reduces the content of corrosive medium in the rust layer, thus improving the Marine atmospheric corrosion resistance of the steel.
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