2300 MPa grade vanadium-containing low alloyed steel: ultrafine microstructure preparation and performance
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摘要: 通过常规热轧和高温退火+冷轧制备了两种不同的初始组织，研究了初始组织对奥氏体化淬火后微观组织和力学性能的影响规律。结果表明，常规热轧样品淬火组织较为粗大，而高温退火+冷轧由于在淬火前引入了更多的晶界、更高密度的渗碳体、VC和位错缺陷，实现了淬火组织的显著细化。热轧样品和冷轧样品均可以实现较高的强度和塑性匹配，但冷轧样品由于更为细化的组织，其强度和塑性更为优异。冷轧样品可以在实现
2384 MPa超高抗拉强度的同时获得14.0%的超高总伸长率，强塑积可达到33.4 GPa·%。Abstract: For a conventional low alloyed steel, two different initial microstructures were achieved by conventional hot rolling and high-temperature annealing followed by cold rolling. The effects of the initial microstructures on the microstructure and mechanical properties after austenitization and quenching were investigated. The results indicate that the quenched microstructure of the conventional hot-rolled sample is relatively coarse, while the high-temperature annealing followed by cold rolling, which introduces more grain boundaries, a higher density of cementite, VC, and dislocation defects before quenching, can significantly refine the quenched microstructure. Both hot-rolled and cold-rolled samples achieve a high strength-ductility balance, but the cold-rolled sample, with its more refined microstructure, exhibits superior strength and ductility. The cold-rolled sample achieves ultra-high tensile strength of2384 MPa and extraordinary total elongation of 14.0%, with product of strength and elongation reaching 33.4 GPa·%. -
图 1 Thermal-Calc热力学平衡相图
Figure 1. Equilibrium thermodynamic phase diagrams predicated by Thermo-Calc
图 4 淬回火后微观组织
(a) RZ低倍组织；(b) LZ低倍组织；(c) RZ高倍组织；(d) LZ高倍组织
Figure 4. Microstructure of steel after quenching and tempering
图 5 EDS面扫结果
(a)面扫选区位置；(b)~(h)元素分布
Figure 5. EDS maping scan results of experimental steel
图 7 试验钢的断口形貌
(a)RZ低倍图；(b)RZ高倍图；(c)LZ低倍图；(d) LZ高倍图
Figure 7. Fracture morphology of experimental steel
图 9 试验钢IPF图和马氏体块尺寸分布直方图
(a) RZ-IPF；(b) LZ-IPF；(c) RZ马氏体块尺寸分布直方图；(d) LZ马氏体块尺寸分布直方图
Figure 9. IPF diagram of experimental steel and histogram of martensite block size distribution
图 11 试验钢组织演变示意
Figure 11. Schematic diagram of microstructure evolution of experimental steel
表 1 试验钢的成分
Table 1. Chemical composition of experimental steel
% C Si Mn Ni Cr Mo V Fe 0.53 1.44 0.44 1.79 0.84 0.51 0.30 Bal. 
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表 2 试验钢的力学性能
Table 2. Mechanical properties of experimental steel
样品 屈服强度/MPa 抗拉强度/MPa 均匀伸长率/% 总伸长率/% 强塑积/(GPa·%) RZ 1757 2329 6.1 9.7 22.6 LZ 1823 2384 8.2 14.0 33.4
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