The effects of intergranular carbides on the grain boundary oxidation and cracking in a cold-worked Alloy 600
The effects of intergranular carbides on the grain boundary oxidation and cracking in a cold-worked Alloy 600
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DOI：
10.1016/j.corsci.2019.05.008
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发表时间：
2019-07
影响因子：
8.3
通讯作者：
Zhao Shen;J. Dohr;S. Lozano-Perez
中科院分区：
文献类型：
--
作者：
Zhao Shen;J. Dohr;S. Lozano-Perez
暴露于压水堆一回路水后，冷加工600合金发生晶间氧化。通过细观力学试验研究了外载荷作用下的沿晶开裂过程。高分辨率分析电子显微镜进行表征的微观结构和化学的氧化晶界之前和之后的微机械测试。晶间碳化物周围的基体被优先氧化，晶间碳化物中的Cr向外扩散，促进富Cr氧化物的形成。裂纹优先传播沿着氧化物-基体界面在微观力学测试。晶间碳化物被认为是增加冷加工后的抗裂性。
Intergranular oxidation occurred in a cold-worked Alloy 600 after exposure to pressurized water reactor primary water. Micromechanical testing was conducted to study the process of intergranular cracking under the external loading. High-resolution analytical electron microscopy was conducted to characterize the microstructure and chemistry of the oxidized grain boundaries before and after the micromechanical testing. The matrix around the intergranular carbides was preferentially oxidized and Cr in the intergranular carbides diffused out to facilitate the formation of Cr-rich oxide. Cracks preferentially propagated along the oxide-matrix interfaces during the micromechanical tests. Intergranular carbides are assumed to increase cracking resistance after cold-working.