Effect of I&Q&P process on microstructure and mechanical properties of C-Si-Mn-Nb dual-phase steel

doi:10.13251/j.issn.0254-6051.2023.03.008

Abstract

Abstract: I&Q&P annealing experiments were carried out on the traditional C-Si-Mn dual-phase steel adding 0.05%Nb by means of CCT-AY-II continuous annealing simulator. The effects of Nb element and I&Q&P process on microstructure evolution and mechanical properties of the tested steel were studied. The microstructure and mechanical properties of the tested steel at partitioning temperature of 350 ℃ and 450 ℃ for different partitioning times (300, 450 and 600 s) were investigated by means of metallographic microscope, scanning electron microscope and X-ray diffraction. The results show that the content of lath martensite decreases and the ferrite increases with the increase of partitioning temperature and partitioning time. The tensile strength of the tested steel shows a decreasing trend, while the elongation shows an increasing trend. The product of strength and plasticity of the steel is optimum when partitioning at 450 ℃ for 450 s, which is 20.48 GPa·%.

Key words: dual-phase steel, partitioning process, microstructure, mechanical properties, work hardening

CLC Number:

Wu Qiuyun, Pan Hongbo, Liu Yonggang, Zhan Hua, Cui Lei. Effect of I&Q&P process on microstructure and mechanical properties of C-Si-Mn-Nb dual-phase steel[J]. Heat Treatment of Metals, 2023, 48(3): 45-50.

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