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对比分析了Cr26-16Mn双金属复合材料与单一Cr26铸铁、16Mn钢的力学性能,利用OM、SEM、XRD等研究了回火温度对Cr26-16Mn双金属复合板组织及性能的影响。结果表明:在1000℃淬火条件下,随回火温度的升高,Cr26-16Mn复合板基材Cr26铸铁和复层16Mn钢硬度均降低,单一16Mn钢及复合板冲击性能提高,复合板冲击吸收能量为单一Cr26铸铁的6~7倍。520℃以下回火时,Cr26铸铁中马氏体分解,残留奥氏体转变析出二次碳化物,基材硬度变化较小;随着回火温度提高,Cr26铸铁组织中析出大量二次碳化物,马氏体分解增加,硬度明显降低。16Mn钢在回火过程中马氏体形态消失,铁素体含量增加,冲击性能提高。在1000℃淬火时,Cr26-16Mn复合板在420~520℃回火能获得较好的硬度及冲击性能。
The mechanical properties of Cr26-16Mn bimetallic composites, single Cr26 cast iron and 16Mn steel were comparatively analyzed. The effects of tempering temperature on the microstructure and properties of Cr26-16Mn bimetallic composite sheets were investigated by OM, SEM and XRD. The results show that the hardness of Cr26-16Mn composite base material Cr26 cast iron and multi-layered 16Mn steel decreases with the increase of tempering temperature at 1000 ℃, the impact properties of single 16Mn steel and composite plate increase, the impact absorption of composite plate 6 to 7 times the energy of a single Cr26 cast iron. When the temperature is lower than 520 ℃, the martensite is decomposed in the Cr26 cast iron and the secondary carbides are precipitated by the residual austenite transformation, the hardness of the substrate changes little. With the increase of tempering temperature, a large amount of secondary carbides , Martensite decomposition increased, the hardness decreased significantly. 16Mn steel in the tempering martensite morphology disappears, the ferrite content increases, the impact performance. Quenching at 1000 ℃, Cr26-16Mn composite board at 420 ~ 520 ℃ tempering can get better hardness and impact properties.