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以一种含Cu低碳钢为对象,应用扫描电镜(SEM)及透射电镜(TEM)等手段研究了碳配分温度对组织演变及力学性能的影响。结果表明:组织中的残余奥氏体主要由分布于马氏体板条间的薄膜状残余奥氏体及马氏体边缘或原奥氏体晶界处的块状残余奥氏体构成,300℃配分处理时获得最高12.8%的残余奥氏体含量;C原子由一次淬火马氏体配分到残余奥氏体或以碳化物形式在基体中析出,实验钢的抗拉强度随配分温度的升高而降低,伸长率显著增加;配分温度为350℃时实验钢获得最佳的综合力学性能,伸长率最高为17.75%,强塑积达19632 MPa·%。
The effect of carbon partitioning temperature on microstructure evolution and mechanical properties was investigated by using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) for a low carbon steel containing Cu. The results show that the residual austenite in the microstructure consists mainly of retained austenite and martensite at the edge of martensite or massive retained austenite at the original austenite grain boundaries. ℃ with the distribution of the highest 12.8% retained austenite content; C atoms by a quenched martensite distribution to the residual austenite or carbide precipitated in the matrix, the tensile strength of the experimental steel with the partition temperature rise High and low, the elongation increased significantly; With the temperature of 350 ℃, the experimental steel obtained the best comprehensive mechanical properties, the highest elongation was 17.75% and the strong plastic product was 19632 MPa ·%.