单晶钼合金的高温蠕变行为研究

Study on the high-temperature creep behavior of single-crystal molybdenum alloys

摘要:

新型反应堆用材料长期服役在载荷和高温极端条件下,抗蠕变性能是其关键服役性能。本文针对先进反应堆用候选材料单晶Mo-14Re合金,在1100K下开展了不同应力(170—245MPa)热蠕变实验。获得了单晶Mo-14Re合金蠕变时长10h-780h的数据,发现单晶Mo-14Re合金的蠕变符合标准蠕变规律,应力指数n为11.7。蠕变机制为位错强化机制,随蠕变时间的增长,位错会形成位错壁(亚结构)、位错网、位错胞三种位错衍生结构。上述研究为先进反应堆材料研发及安全服役提供了科学依据。

Abstract:

New reactor materials serve for a long time Under extreme loads and high temperatures. Creep resistance is the key service performance. In this paper, thermal creep experiments with different stresses (170-245MPa) were carried out at 1100K for the candidate material single crystal Mo-14Re alloy for advanced reactors. The creep time of the single crystal Mo-14Re alloy was obtained from 10 h to 780 h, and it was found that the creep of the single crystal Mo-14Re alloy conformed to the standard creep law, and the stress index n was 11.7. The creep mechanism is dislocation reinforcement, and with the increase of creep time, dislocation will form three dislocation derived structures: dislocation wall (substructure), dislocation network and dislocation cell. The above research provides a scientific basis for the research and development and safe service of advanced reactor materials.