双相区形变对含Cu低碳钢Cu配分行为及组织性能影响

发布时间：2019-02-11 18:52

【摘要】：采用双相区形变+IQP及IQP(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+IQP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IQP工艺相比,双相区形变+IQP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。
[Abstract]:The effect of dual phase deformation on the structure and properties of a low carbon steel containing Cu was studied by means of dual phase deformation IQP and IQP (dual phase isothermal austenitization quenching carbon partition) heat treatment process. Electron probe (EPMA), scanning electron microscope (SEM) and transmission electron microscopy (TEM) were used to characterize the structure evolution of the element. The results show that after two kinds of treatment, the Cu elements of the experimental steel are separated into reverse austenite, and the area of Cu rich in the structure treated by dual phase deformation IQ (dual phase zone heat preservation quenching) is 12.9%. Compared with IQ process, the area rich in Cu was increased by 108%. The grain size of the experimental steel treated by deformed IQP process in the dual phase region is obviously refined, and there is more residual austenite in the microstructure. Compared with single IQP process, the tensile strength, elongation and residual austenite volume fraction increased from 1 253MPa to 1 293 MPA, from 16. 9% to 18. 3 MPA, and from 11. 6% to 13. 8 MPA, respectively. The results show that the dual phase deformation treatment of 30% in the dual phase region can promote the increase of residual austenite content and fine grain strengthening of Cu branches.
【作者单位】：华北理工大学教育部现代冶金技术重点实验室;
【基金】：国家自然科学基金资助项目(51574107,51501056) 河北省自然科学基金资助项目(E2017209048,E2015209243) 河北省高等学校科学技术研究资助项目(QN2016185)
【分类号】：TG142.1;TG161

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