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首页> 外文期刊>ISIJ international >Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing
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Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

机译：新热机械加工方法开发的超细晶粒双相钢的强化机理

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Dual phase (DP) steels have been investigated using a new approach utilizing simple cold-rolling and subsequent intercritical annealing of a martensite-ferrite duplex starting structure. The ferrite grain size and volume fraction of martensite were varied by changing the rolling reduction and intercritical annealing time. Ultrafine grained DP (UFG-DP) steel with an average grain size of about 2 μ m was achieved by short intercritical annealing of the 80% cold–rolled duplex microstructure. Tensile testing revealed superior mechanical properties (the ultimate tensile strength of 1100 MPa and elongation of 13%) for the new DP steel in comparison with the commercially used high strength DP980 steel. The variations in hardness, strength and elongation of the specimens with rolling reduction and intercritical holding time were correlated to microstructural characterizations. The inherent mechanism for strengthening of the DP steel was discussed and the contribution of each strengthening factor was quantitatively calculated. The results showed that the calculated yield strength (430.6 MPa) is very close to the measured value (422 MPa).
机译：已经使用一种新方法研究了双相（DP）钢，该方法利用了简单的冷轧和随后的马氏体-铁素体双相起始结构的临界间退火。马氏体的铁素体晶粒度和体积分数通过改变压下量和临界退火时间而改变。通过对80％的冷轧双相组织进行短时间的临界退火，可以获得平均晶粒尺寸约为2μm的超细晶粒DP（UFG-DP）钢。拉伸测试表明，与商用高强度DP980钢相比，新型DP钢具有优异的机械性能（极限抗拉强度为1100 MPa，伸长率为13％）。试样的硬度，强度和伸长率随轧制减量和临界间保持时间的变化与显微组织特征有关。讨论了DP钢强化的内在机理，并定量计算了每个强化因子的贡献。结果表明，计算的屈服强度（430.6 MPa）非常接近测量值（422 MPa）。

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