首页|Uncovering Microstructure-Property Relationship in Ni-Alloyed Fe-Mn-Al-C Low-Density Steel Treated by Hot-Rolling and Air-Cooling Process
Uncovering Microstructure-Property Relationship in Ni-Alloyed Fe-Mn-Al-C Low-Density Steel Treated by Hot-Rolling and Air-Cooling Process
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This paper focuses on the relationship between the microstructure and tensile properties of Fe-Mn-Al-C low-density high-strength steel processes by hot-rolling and air-cooling process.The microstructure analysis reveals that the combination of hot-rolling and air-cooling results in the formation of heterogeneous structures comprising different-sized y and B2 phases in the low-density steel with the addition of nickel(Ni).The addition of Ni promotes the formation of the B2 phase and induces the pinning of B2 phase particles at the γ grain boundaries.This pinning effect effectively hinders the growth of the γ grains,leading to grain refinement.The tensile test results demonstrate that LDS-5Ni(low-density steel,LDS)exhibits excellent high strength and ductility combination,e.g.,a tensile strength of 1535 MPa,yield strength of 1482 MPa,and elongation of 23.3％.These remarkable mechanical properties are primarily attributed to the combined strengthening contributions of grain refinement and duplex nano-sized second-phase precipitation hardening.
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