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对低负荷长时间蠕变试验下800H合金显微组织的研究表明:空洞在晶界M_(23)C_6碳化物的一侧形成,微裂纹通过一连串这样的小空洞而发展;晶界M_(23)C_6碳化物和相邻两晶粒之一有共格关系而与另一晶粒无共格界面,共格界面强化了晶界,这一强化作用可用蠕变激活能的提高来说明,晶界还有G相析出,但未发现合金中有γ’相的形成。合金能长时间保留网状的位错结构,晶界碳化物附近有位错塞积,亚晶界结构发展不充分,这与典型的回复蠕变是不同的。
The microstructure of 800H alloy under low load and long time creep test shows that the cavity is formed on one side of M_ (23) C_6 carbide and the microcracks develop through a series of such small voids. The grain boundary M_ (23) ) C_6 carbide and one of the two adjacent grains have a coherent relationship with another grain coherent interface, coherent interface strengthened grain boundaries, this strengthening effect can be used to explain the increase in creep activation energy, crystal G-phase precipitation there, but did not find the alloy in the formation of γ ’phase. The alloy can retain the reticular dislocation structure for a long time, with dislocation plugging near the grain boundary carbides, and the subgrain boundary structure is underdeveloped, which is different from the typical recovery creep.