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采用双相区保温-淬火(IQ)及双相区形变-保温-淬火热处理工艺,研究了形变对一种含Cu低碳钢的组织演变及其Cu配分行为的影响。采用光学显微镜(OM)、扫描电镜(SEM)及电子探针(EPMA)等手段对组织演变及Cu配分行为进行了表征。结果表明:IQ工艺处理后,试验钢由多边形铁素体和珠光体的初始组织转变为铁素体和马氏体双相组织,少量多边形铁素体转变形板条马氏体;双相区形变+IQ处理后组织中多边形铁素体由于形变力作用发生微小变形且含量降低,板条马氏体含量显著增加;IQ工艺下组织中含Cu最高区域的Cu元素平均浓度为0.896,而采用双相区形变+IQ处理的组织中为1.025,是基体平均Cu浓度的2.5倍,且其富Cu区域面积比为23.8%。上述结果表明,通过IQ处理前的形变处理提高空位浓度,可以有效促进Cu配分效果。
The effects of deformation on the microstructure evolution and Cu distribution of a Cu-containing low carbon steel were investigated by means of dual-phase insulation-quenching (IQ) and dual-phase zone deformation-holding-quenching heat treatment. The microstructure evolution and Cu partitioning behavior were characterized by OM, SEM and EPMA. The results show that after the IQ process, the test steels are transformed from the initial microstructure of polygonal ferrite and pearlite to ferrite and martensite dual phase microstructure, a small amount of polygonal ferrite transformation lath martensite; After deformation + IQ treatment, the microstructure of polygonal ferrite deformed slightly and its content decreased, the lath martensite content increased significantly. The average concentration of Cu element in the highest Cu content was 0.896 in the IQ process, Biphasic degeneration + IQ-treated tissue was 1.025, which was 2.5 times the average Cu concentration of the matrix, and its Cu-rich area ratio was 23.8%. The above results show that the effect of Cu partitioning can be effectively promoted by increasing the vacancy concentration by the pre-IQ deformation treatment.