Oxidation behaviour of alloy 800 in an impure helium atmosphere at high temperatures
Oxidation behaviour of alloy 800 in an impure helium atmosphere at high temperatures
复制标题
800合金在不纯氦气氛中的高温氧化行为
DOI：
10.1016/0010-938x(92)90146-t
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
T. Moroishi
中科院分区：
文献类型：
--
作者：
Y. Shida;T. Moroishi
研究了800合金在高温气冷堆典型环境中的不纯氦气（含H_2、H_2O、CH_4CO、CO_2）中的高温行为，特别强调了碳转移和选择性氧化行为。在本研究的条件下，仅观察到有限的碳运输，正如热力学研究所预期的那样。最重要的损伤模式是晶间氧化，据观察，发展到相对较深的基板。晶间氧化是选择性氧化的结果。在选择性氧化过程中产生的铬耗尽可能导致空位注入合金。空位可能已经扩散并最终凝结为晶界区域中的空隙，这可能已经提供了快速的氧供应路径，从而允许氧化物沿着它们形成。
The high temperature behaviour of Alloy 800 in impure helium (containing H2, H2O, CH4CO, CO2) typical of the environment to be encountered in High Temperature Gas-cooled Reactors was studied, with particular emphasis on the carbon transfer and the selective oxidation behaviour. Under the conditions of the present study, only limited carbon transport was observed, as was expected from a thermodynamic study. The most important mode of damage was intergranular oxidation which was observed to develop relatively deeply into the substrate. The intergranular oxidation resulted from selective oxidation. The chromium depletion developed during the selective oxidation may have caused vacancies to be injected into the alloy. The vacancies may have diffused and finally condensed as voids in the grain boundary area, which may have provided a fast oxygen supply path, allowing oxide formation along them.