冷轧板条马氏体组织与力学性能研究

doi:10.11896/cldb.19040207

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Abstract In this study, AISI 1010 was rapidly cooling to get the lath martensite completely. After cold rolling, it was developed ultra-high strength steel. The mechanical properties of the experimental steels after cold rolling deformation were investigated. Using optical microscopy and scanning electron microscopy, microstructural evolution and tensile fracture morphology were observed. The experimental results show that the AISI 1010 steel with lath martensite structure can still maintain good plasticity(the elongation about 15%) when its tensile strength exceeds 1.3 GPa. With the increase of cold rolling deformation, the strength and hardness of the material increase significantly, while the plasticity gradually decreases. When the cold rolling deformation is greater than 30%, the elongation after fracture is less than 10%. When the cold rolling reduction reach 80%, the hardness of lath martensite steel is increased to 532HV (80%) from 440HV (undeformed). The tensile strength of the experimental steel exceeds 2.0 GPa (80%). With the increase of cold rolling deformation, the spacing of cold-deformed martensite decreases. The deformation microstructures tend to parallel with the rolling direction and gradually change to the layered structure. With the increase of cold rolling deformation, the dimples and voids reduce at the center of the fracture. The size and depth of the dimples are decreased. The voids are connected to each other and the crack initiation occurs. The obvious layered cracks and tearing structure appear in the fracture. When the deformation reaches 80%, the layered structure and tear-like crack are very obvious.

Key words： low-carbon martensite ultra-high strength cold rolling microstructure fracture behavior

Published: 25 April 2020

CLC number:

TG113

Fund:This work was financially supported by the Natural Science Foundation of Hebei Province for Distinguished Young Scholar (E2017203036).

About author:: Yu Zhougraduated from Yanshan University in June 2017 with a bachelor's degree in engineering. Now he is a graduate student of the School of Mechanical Engineering at Yanshan University, and he is conducting research under the guidance of Professor Zhiqing Lv. At present, he is mainly engaged in the research of preparation and processing of ultra- high strength me-tals. In 2018, he published a paper in the journal J. Magn. Magn. Mater as the first author. Authorized to invent a profit.
Zhiqing Lyu, professor at Yanshan University. In 2008, he graduated from Yanshan University. A study visit was conducted at the University of Kentucky from July to November 2014, and a study was conducted at the Technical University of Denmark from March 2015 to March 2016. He has been engaged in research on the preparation of advanced steel materials and structu-ral characterization. As a major participant, he has participated in many projects such as the National Natural Science Foundation of China and the National Science and Technology Support Program, and has completed the National Natural Science Foundation of China. Xiang, 2 natural science fund projects of Hebei Province. In 2017, it was supported by the Outstanding Youth Science Fund Project of Hebei Province. He has published more than 60 papers, including more than 40 papers in SCI index and 20 patents have been granted. He won the third prize of Natural Science of Hebei Province, and guided the graduate students to obtain 2 excellent master’s thesis articles of Yanshan University and 1 excellent master’s thesis of Hebei Province.

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	ZHOU Yu
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Cite this article:

ZHOU Yu,QIAN Lihua,LIU Tianyu, et al. Microstructure and Mechanical Properties of Lath Martensite After Cold Rolling[J]. Materials Reports, 2020, 34(8): 8154-8158.

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http://www.mater-rep.com/EN/10.11896/cldb.19040207 OR http://www.mater-rep.com/EN/Y2020/V34/I8/8154

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