Transactions of Materials and Heat Treatment

Title：Influence of cold rolling on microstructure and mechanical properties of

Authors： Li Shihan Chen Yingbin Chen Changfeng Wang Xiaolin Zhao Wei Li Zunzhao1

Unit： China Petroleum & Chemical Corporation Guangzhou Testing Centre of Construction Quality & Safety Co. Ltd. China University of Petroleum (Beijing)

KeyWords： TWIP steel cold rolling microstructure mechanical properties deformation

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2018,43(11):146-155

Abstract：

The influences of cold rolling on microstructure and mechanical properties of Fe-16Mn-0.6C-2.5Al TWIP steel were studied by metallographic microscope (OM), transmission electron microscope (TEM), scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the yield strength and tensile strength of specimens increase with the increasing of cold rolling deformation, whereas the elongation decreases, and the twins are more difficult to produce during stretching. Therefore, the working hardening rate of specimens decreases with the increasing of strain. When 10%-50% cold deformation is applied, the equiaxed grains containing annealed twins are elongated, and the evolution of substructures in the organization happens including dislocations, twins and the interaction of dislocations with twins. Furthermore, the slip bands, the first twins, the secondary twins, the shear bands and a small amount of ε martensite appear in sequence. The fractography shows that with the increaing of cold rolling deformation, the fractures become more and more brittle in the specimens.

Funds：

国家重点研发计划资助（2017YFF0210404)

李世瀚（1991-），男，硕士，助理工程师,E-mail：lishihan.dshy@sinopec.com

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