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采用双相区形变+I&Q&P及I&Q&P(双相区等温-奥氏体化-淬火-碳配分)热处理工艺,研究了双相区形变对一种含Cu低碳钢Cu配分行为及其组织性能的影响。采用电子探针(EPMA)、扫描电镜(SEM)及透射电镜(TEM)等手段对元素配分行为及组织演变进行了表征。结果表明:实验钢经2种工艺处理后均出现Cu元素向逆转奥氏体的配分行为,采用双相区形变+IQ(双相区保温淬火)处理的组织中富Cu最高的区域面积为12.9%,比IQ工艺下富Cu区域提高108%;双相区形变+I&Q&P工艺处理后实验钢的晶粒明显细化,且组织中块状残余奥氏体较多;与单一I&Q&P工艺相比,双相区形变+I&Q&P工艺处理的实验钢抗拉强度由1 253MPa提高到1 293MPa,伸长率由16.9%提高到18.3%,残余奥氏体体积分数由11.6%提高到13.8%,表明双相区30%的形变处理实现了促进Cu配分行为诱导残余奥氏体含量增加和细晶强化的双重效果。
The dual-phase zone deformation + I & Q & P and I & Q & P heat treatment process were used to study the Cu particle distribution behavior and microstructure properties of a mild steel with low Cu content. influences. Electron microprobe (EPMA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize elemental partitioning and microstructure evolution. The results show that the distribution of Cu element to reversed austenite appears in experimental steel after treated by two kinds of processes. The area with the highest Cu content is 12.9% in the tissue treated with dual phase deformation + IQ (dual phase quenching) , Which is 108% higher than that of the Cu-rich region under the IQ process. The grain size of the experimental steel after the dual phase zone deformation + I & Q & P process is obviously refined and the retained austenite in the structure is more. Compared with the single I & Q & P process, The tensile strength of the experimental steel treated by phase deformation + I & Q & P increased from 1 253 MPa to 1 293 MPa, the elongation increased from 16.9% to 18.3% and the retained austenite volume fraction increased from 11.6% to 13.8% The 30% deformation treatment achieved the dual effect of promoting the distribution of retained austenite content and fine grain strengthening induced by Cu complexation behavior.