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采用晶界萃取碳复型等实验技术，研究了Ｎｉ－ Ｃｒ－ Ｍｏ－ Ｆｅ － Ｗ 合金宏观“黑斑”缺陷特征的微观形成机制．该合金中“黑斑”缺陷的形成归因于钨、钼等元素在这里的富集．富集的钨、钼元素主要以数量较多、尺寸较大的富含钼、钨的Ｍ６Ｃ和Ｐ相的形式存在于晶界上，使“黑斑”区的晶粒细小、晶界易受侵蚀且弱化．
The micro-formation mechanism of macro-dark spot defects in Ni-Cr-Mo-Fe-W alloy was studied by means of experimental techniques such as grain boundary extraction carbon complexing. The formation of “dark spots” in the alloy is attributed to the enrichment of tungsten, molybdenum and other elements here. Enriched tungsten and molybdenum are mainly present in the grain boundary in the form of M6C and P phases rich in molybdenum and tungsten with large size and large size, making the grains in the “black spot” region small and the grain boundary susceptible Eroded and weakened.