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Correlation of Mechanical Properties with Fracture Surface Features in a Newly Developed Dual-Phase Steel

机译:新型双相钢的力学性能与断裂表面特征的相关性

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Dual-phase (DP) steels were produced by a newly developed method utilizing simple cold-rolling and subsequent short intercritical annealing of a martensite-ferrite duplex starting structure. Tensile testing revealed an excellent strength-elongation balance (UTS x UE a parts per thousand 110-150 J/cm(3)) for the DP steels in comparison with the commercially used high strength steels. Fracture surfaces of the tensile specimens were studied by scanning electron microscopy analysis and image processing. Mechanical properties were correlated with fracture surface features. It was found that the variation of the total elongation and strength-elongation balance with the martensite volume fraction could be well correlated with the variation of the average dimple area. The variation of the yield strength and dimple areal density with the martensite volume fraction followed the same trend.
机译:双相(DP)钢是通过一种新开发的方法生产的,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短时临界退火。拉伸测试表明,与市售高强度钢相比,DP钢具有出色的强度-伸长率平衡(UTS x UE a千分之110-150 J / cm(3))。通过扫描电子显微镜分析和图像处理研究了拉伸试样的断裂表面。力学性能与断裂表面特征相关。结果表明,总伸长率和强度-伸长率平衡随马氏体体积分数的变化与平均凹坑面积的变化具有良好的相关性。屈服强度和凹坑面密度随马氏体体积分数的变化遵循相同的趋势。

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