Zhang Zhibo,Liu Zailong,Xu Mei,et al.Effect of Heat Treatment Temperature on Microstructure and Properties of Fe-27Mn-9Al-1C-0.25V Low-density Steel[J].Special Steel,2025,46(05):91-95.
Zhang Zhibo,Liu Zailong,Xu Mei,et al.Effect of Heat Treatment Temperature on Microstructure and Properties of Fe-27Mn-9Al-1C-0.25V Low-density Steel[J].Special Steel,2025,46(05):91-95. DOI: 10.20057/j.1003-8620.2025-00048.
Effect of Heat Treatment Temperature on Microstructure and Properties of Fe-27Mn-9Al-1C-0.25V Low-density Steel
Mechanical properties, microstructure and fracture behavior of Fe-27Mn-9 Al-1C-0.25V low-density steel were analyzed after different heat treatment temperature.The results show that with the increased of heat treatment temperature from 700 ℃ to 1 000 ℃, the yield strength and tensile strength of the experimental steel decreased continuously, while the elongation increased continuously.When the heat treatment temperature reached 900 ℃, the plasticity of experimental steel was significantly improved. The experimental steel heat treated at 1 000 ℃, the product of strength with ductility reached the highest , its tensile strength reached 960 MPa, total elongation was 46%, and product of strength with ductility reached 44.16 GPa·%. Through microstructure of samples at different heat treatment temperatures, it was found that when the heat treatment temperature was ≤800 ℃, a distinct precipitate phase can be observed at the austenite-ferrite interface, identified as κ-type carbides. The κ-type carbides at the interphase can cause crack initiation, leading to a significant reduction in the toughness and ductility of the test steel.
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