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研究了分级保温热处理对高铬白口铸铁组织转变、硬度、冲击韧性及耐磨性的影响。结果表明:高铬白口铸铁分级保温处理中,基体中过饱和的碳和合金元素会以二次碳化物的形式析出,残留奥氏体发生马氏体转变。在1150℃×2 h+890℃×5 h分级保温过程中,随着保温时间的延长有大量二次碳化物析出,首先析出颗粒状的(Cr,Fe)23C6,然后基体和(Cr,Fe)23C6发生原位转变生成片状的(Cr,V)2C和长条状的(Cr,Fe)7C3,有效地提高了合金的硬度、冲击韧性及抗磨损能力。
The effects of heat treatment in graded insulation on the microstructure, hardness, impact toughness and wear resistance of high chromium white cast iron were studied. The results show that during the graded thermal insulation of high-chromium white cast iron, the supersaturated carbon and alloying elements in the matrix precipitate as secondary carbides and the retained austenite undergoes martensitic transformation. In the process of 1150 ℃ × 2 h + 890 ℃ × 5 h fractional heat preservation, a large amount of secondary carbides were precipitated with the prolongation of holding time. Particulate (Cr, Fe) 23C6 was first precipitated and then the matrix and (Cr, Fe (Cr, V) 2C and long strip of (Cr, Fe) 7C3 occur in situ transformation of 23C6, which effectively improves the hardness, impact toughness and wear resistance of the alloy.