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图为45号钢制件。基体为马氏体及沿奥氏体晶界的块状铁素体,部分块状铁素体边缘有屈氏体组织出现。
The picture shows the 45th steel parts. The matrix is martensite and massive ferrite along the austenite grain boundaries. Some of the massive ferrite edges have troostite organization.