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首页> 外文期刊>ISIJ international >Distribution Characteristics and Thermal Stability of Primary Carbide in Cast Ce-H13 Steel
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Distribution Characteristics and Thermal Stability of Primary Carbide in Cast Ce-H13 Steel

机译：Ce-H13铸钢中一次碳化物的分布特性和热稳定性

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摘要

The primary carbide precipitated during the solidification process will act as the crack source to reduce the performance of H13 steel. It is necessary to obtain the nature of the primary carbide in H13 steel to reduce its detriment. Therefore, the distribution characteristics and thermal stability of the primary carbide in cast Ce-H13 steel were analyzed in this paper. There is a huge difference in the shape of the primary carbide between the 2D observation and the 3D observation. The shape of the primary carbide is a dendritic structure, and the branch is rich-V carbide and the trunk is rich-Ti-V carbide. The primary carbide size in the 3D observation increases gradually from the margin of the Ce-H13 ingot to the center. The rapid growth of the branch leads to an increase in size, and the decrease in the cooling rate is the main reason for the increase in size. When the heating temperature is 1150°C, the rich-V carbide starts to dissolve and dissolved completely at 1250°C. However, the rich-Ti-V carbide just starts to dissolve when the heating temperature is 1250°C. The number density and size of primary carbide decrease gradually with the increase of the heating temperature. Elemental Ce can effectively decrease the size of the primary carbide, but not for the number density. The calculated results are in keeping with the experimental observations. High-temperature heating can effectively reduce the primary carbide size, but cannot eliminate it.
机译：凝固过程中析出的初级碳化物将充当裂纹源，从而降低H13钢的性能。必须获得H13钢中初级碳化物的性质，以减少其危害。因此，本文分析了Ce-H13铸钢中一次碳化物的分布特征和热稳定性。在2D观测和3D观测之间，一次碳化物的形状存在巨大差异。初级碳化物的形状为树枝状结构，其分支为富钒碳化物，主干为富钛Ti碳化物。在3D观测中，一次碳化物的尺寸从Ce-H13铸锭的边缘到中心逐渐增大。分支的快速增长导致尺寸增加，并且冷却速率的降低是尺寸增加的主要原因。当加热温度为1150°C时，富V碳化物开始溶解并在1250°C完全溶解。然而，当加热温度为1250°C时，富Ti-V碳化物才开始溶解。随着加热温度的升高，一次碳化物的数量密度和尺寸逐渐减小。 Ce元素可以有效地减小一次碳化物的尺寸，但不能减小数量密度。计算结果与实验结果吻合。高温加热可以有效地减小一次碳化物的尺寸，但不能消除。

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