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首页> 外文会议>AIST steel properties amp; applications conference proceedings combined with MSamp;T' 10 materials science and technology 2010 >Investigation of the Hot Ductility Trough of Nb-containing Steel
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Investigation of the Hot Ductility Trough of Nb-containing Steel

机译：含铌钢热延性槽的研究

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摘要

It is well known that a fine dispersion of precipitates can strongly decrease the hot ductility of low carbon steel at temperatures around 900 to 1000℃. This is attributed to an increase of the recrystallization start temperature during hot forming. In the present investigation, focus is laid on the second ductility minimum and a correlation between the measured fracture characteristics and NbC-precipitation observed in regions at and around the austenite grain boundaries is attempted. In the analysis, several low carbon steel samples were tensile tested to fracture at different temperatures. In order to quantify the size distribution of the NbC precipitates at and around the grain boundaries, carbon extraction replica were produced. The experimentally observed variation of ductility can be explained on the basis of the differences in size and distribution of the NbC precipitates. The high density of small precipitates at the lower test temperatures acts as an efficient inhibitor to recrystallization during deformation and can clearly be made responsible for the significant decrease in hot ductility in the second ductility trough.
机译：众所周知，析出物的良好分散会大大降低低碳钢在900至1000℃左右的温度下的热延展性。这归因于热成型期间再结晶开始温度的升高。在本研究中，重点放在第二延展性最小值上，并尝试在奥氏体晶界及其周围区域观察到的断裂特性与NbC析出之间的相关性。在分析中，对几个低碳钢样品进行了拉伸测试，使其在不同温度下断裂。为了量化在晶界处和周围的NbC沉淀物的尺寸分布，生产了碳提取品。实验观察到的延展性变化可以根据NbC沉淀物的尺寸和分布差异来解释。在较低的测试温度下，高密度的小析出物可以有效地抑制变形过程中的再结晶，并且显然可以使第二延性槽中的热延展性显着降低。

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