将晶界萃取碳复型技术同其它实验技术相配合,研究了Ni-Cr-Fe-Mo-Co-W合金宏观"黑斑"缺陷特征的形成原因,认为"黑斑"缺陷主要是由晶界易腐蚀引起的.在"黑斑"区不均匀富集的钨、钼元素主要以数量较多、尺寸较大的富含钼、钨的M6C形式存在于晶界上,使"黑斑"区的晶界易受腐蚀.该合金中的"黑斑"缺陷具有元素的宏观偏聚和微观偏聚相结合的特点.
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