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首页> 外文期刊>ISIJ international >Characterization of internal voids and cracks in cold heading of dual phase steel
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Characterization of internal voids and cracks in cold heading of dual phase steel

机译：双相钢冷head内部空隙和裂纹的表征

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摘要

In this work, the mechanism of void and microcrack formation along the adiabatic shear bands (ASB) was studied for processing dual phase steel by cold heading. Experimental investigation along with finite element simulation has confirmed that this mechanism depends on two types of instabilities, namely geometrical and thermal instabilities. The geometric instability occurs in the presence of second phase particles (inclusions) and in relation to the material flow orientation, whilst the thermal softening arises due to the localized plastic deformation inside the ASB. Progressive deformation was observed to cause the elongation of voids in the direction of shearing that formed microcracks in the ASB of the cold headed specimen. In addition, transformed bands were observed in the highly deformed zones as a result of the temperature in the ASB exceeding the Ac_3 transformation temperature 847 deg C. The superposition of the location of the ASB region containing the voids and micro-cracks with the phase transformation zone indicates that the development of optimized processing conditions is particularly critical for preventing fracture during cold heading of dual phase steels.
机译：在这项工作中，研究了沿绝热剪切带（ASB）形成空隙和微裂纹的机理，以进行冷processing处理双相钢。与有限元模拟一起的实验研究已经证实，这种机理取决于两种类型的不稳定性，即几何和热不稳定性。几何不稳定性在第二相颗粒（夹杂物）的存在下发生并且与材料的流动方向有关，而热软化则是由于ASB内部的局部塑性变形而引起的。观察到渐进变形导致在剪切方向上的空隙伸长，该剪切方向在冷head试样的ASB中形成微裂纹。此外，由于ASB中的温度超过Ac_3相变温度847℃，在高度变形的区域中观察到了相变带。包含相变的空隙和微裂纹的ASB区域的位置重叠该区域表明，优化工艺条件的发展对于防止双相钢冷head过程中的断裂特别重要。

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