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本文研究了一种高强度铁基高温合金的中温脆断现象,即由晶界脆化而导致的塑性剧降。通过对合金的加工和热处理历史、显微组织和断口特点、显微成分的再分布、以及试验时环境介质的影响等因素的分析讨论,确定中温时的脆化是由于氧的渗入和晶界处胞状析出以及它们间交互作用所造成。探索了一些防止晶界脆化的措施,使合金固有的良好塑性得以恢复。研究得出,氧强烈地促进合金中胞状析出而应力进一步加速此过程。根据所得试验结果,提出了新的脆化机制
In this paper, the phenomenon of medium temperature brittle fracture of a high strength iron-based superalloy is studied, namely the plastic ductility caused by the embrittlement of the grain boundary. By analyzing and discussing the history of alloy processing and heat treatment, the microstructure and fracture characteristics, the redistribution of microscopic components and the influence of environmental medium during the test, it is determined that the embrittlement at medium temperature is due to the infiltration of oxygen and the grain boundary Cell precipitation and the interaction between them caused. Some measures to prevent grain boundary embrittlement have been explored to restore the inherent good ductility of the alloy. Studies have shown that oxygen strongly promotes cell-like precipitation in the alloy and the stress further accelerates the process. According to the test results obtained, a new embrittlement mechanism is proposed