钠中热条带化引起的渗碳材料非扩展裂纹

Abe Hideaki, N. Yokota
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引用次数: 0

摘要

为了研究快中子增殖反应堆(FBRs)用液态钠冷却剂中热条带化引起的裂纹扩展特性,采用304型不锈钢和304型不锈钢等离子渗碳生产的材料进行了钠中的热条带化试验。结果表明,在平面应力条件下,由热应力分析得出的阈值应力强度因子范围可用于预测非扩展裂纹的最终长度。非扩展裂纹深度随碳含量的增加而增加。这种趋势是由于材料的杨氏模量不同导致应力强度因子范围的不同。
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Nonpropagating Cracks of Carburized Materials Caused by Thermal Striping in Sodium
In order to investigate crack growth characteristics due to thermal striping in liquid sodium coolant used for fast breeder reactors (FBRs), thermal striping tests in sodium have been conducted using Type 304 stainless steel and material produced by plasma carburizing Type 304 stainless steel. The results showed that the threshold stress intensity factor range, derived from a thermal stress analysis under the condition of plane stress, could be used to predict the final lengths of the nonpropagating cracks. The depths of nonpropagating cracks increased with increasing carbon content. This tendency was attributed to the difference of the stress intensity factor range, caused by the difference in Young's moduli of the materials.
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