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采用OM、SEM、TEM、XRD等试验方法,对不同固溶温度下Fe-27Mn-8Al-1.6C低密度钢的力学性能和组织演变规律进行了研究。结果表明,Fe-27Mn-8Al-1.6C钢的密度为6.8 g/cm3。固溶处理对该钢的组织与性能影响较大,高温固溶后试验钢奥氏体晶界间有少量к-碳化物,随着固溶温度的升高,晶界间未溶к-碳化物含量减少直至消失,奥氏体中C含量逐渐增加;在1000℃固溶处理后,试验钢具有最佳的强塑性配合,抗拉强度为1266 MPa,断后伸长率为34%,强塑积可达43.1 GPa·%;在冷却过程中,试验钢基体发生调幅分解,大量细小的к-碳化物弥散分布在奥氏体内。
The mechanical properties and microstructure evolution of Fe-27Mn-8Al-1.6C low density steel at different solution temperatures were investigated by means of OM, SEM, TEM and XRD. The results show that the density of Fe-27Mn-8Al-1.6C steel is 6.8 g / cm3. The effect of solution treatment on the microstructure and properties of the steel is large. There is a small amount of к-carbides between the austenite grain boundaries after high temperature solid solution treatment. With the increase of solution temperature, the intergranular dissolution and carbonization The content of C decreased until austenite gradually increased. After the solution treatment at 1000 ℃, the test steel had the best plasticity, the tensile strength was 1266 MPa, the elongation after fracture was 34% Product up to 43.1 GPa ·%; during cooling, the test steel substrate amplitude modulation decomposition, a large number of small к-carbide dispersed in the austenite.