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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Heating Rate during Continuous Annealing on Microstructure and Mechanical Properties of High-Strength Dual-Phase Steel
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Effect of Heating Rate during Continuous Annealing on Microstructure and Mechanical Properties of High-Strength Dual-Phase Steel

机译：连续退火过程中加热速率对高强度双相钢的微观结构和力学性能的影响

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摘要

The study concerns the influence of heating rate during continuous annealing on microstructure and mechanical properties of high-strength ferrite-martensite dual-phase (DP) steel. The study suggests that the superheat (Delta T), carbon diffusion and distribution were strongly influenced by increasing the heating rate, leading to different microstructure and mechanical properties of DP steel. The morphology of martensite was observed to shift from network along ferrite grain boundaries to banded structure to uniformly dispersed, and the average ferrite grain size was refined from 5.3 to 2.0 mu m. When the heating rate was 300 degrees C/s, the steel exhibited excellent mechanical properties with tensile strength (UTS) of 982 MPa, total elongation (TEL) of 17.5%, strength-elongation balance (UTS x TEL) of 17.2 GPa%, because of finer microstructure, uniform martensite distribution and low carbon content of martensite. Moreover, the precipitation strengthening effect of NbC is an important reason for the high-strength DP steels. In addition, the variation in strain-hardening behavior and fracture mechanism of steel subjected to different heating rates is discussed in relation to the microstructure.
机译：该研究涉及在连续退火过程中对高强度铁氧体 - 马氏体双相（DP）钢的微观结构和力学性能期间的加热速率的影响。该研究表明，通过提高加热速率，过热（ΔT），碳扩散和分布强烈影响，导致DP钢的微观结构和机械性能。观察到马氏体的形态从沿铁氧体晶体边界从网络转向，以均匀分散，并且平均铁氧体晶粒尺寸从5.3〜2.0 mu m中精制。当加热速率为300摄氏度C / S时，钢的抗拉强度（UTS）具有982MPa的抗拉强度（UT），总伸长率（Tel）为17.5％，强度 - 伸长率（UTS X Tel）为17.2GPa％，由于较好的微观结构，马氏体的均匀马氏体分布和低碳含量。此外，NBC的沉淀强化作用是高强度DP钢的重要原因。此外，关于微观结构讨论了经受不同加热率的应变硬化行为和钢的裂缝机制的变化。

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