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23 results on '"Chen, Qiwei"'

5. Cation affinity purification of histidine-tagged proteins

Author

Sun, Hongxu, primary, Wang, Hongrui, additional, Chen, Qiwei, additional, Dong, Wenge, additional, Gao, Chao, additional, Song, Haiyan, additional, Peng, Hui, additional, Li, Ren, additional, Wu, Hao, additional, Hou, Liangyu, additional, Chang, Yanhong, additional, and Luo, Hui, additional

Published
2023
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6. Effect of Vanadium on Superhardenability of 23MnNiMoCr54V Steel for Round-Link Chain in Mining Applications

Author

Lv Zhiqing, Zhu Zhe, Chen Qiwei, Liu Haonan, Li Rong-Bin, Qi Jianjun, Fu Wantang, and Sun Shuhua

Subjects
010302 applied physics, Austenite, Materials science, Scanning electron microscope, Mechanical Engineering, Metallurgy, Vanadium, chemistry.chemical_element, 02 engineering and technology, Nitride, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, chemistry, Mechanics of Materials, Ferrite (iron), 0103 physical sciences, General Materials Science, Grain boundary, 0210 nano-technology, Hardenability
Abstract

The effect of vanadium on the hardenability and microstructure of 23MnNiMoCr54V steel was investigated after austenitizing at 950 and 1050 °C by dilatometry and end-quenching Jominy tests, combined with nitrogen removal with aluminum. Electron probe micro-analysis, scanning electron microscopy and transmission electron microscopy techniques were used to characterize the microstructure and existence state of vanadium atoms in the steel. The presence of aluminum-stabilized nitrogen by aluminum nitride production, which promoted the segregation of solid solution vanadium atoms at grain boundaries, delayed the transformation of ferrite and improved the austenite stability. Thus, vanadium addition could improve the hardenability, and an excellent steel performance could be obtained during slower cooling. This process could be used to produce heavy section steel components, such as round-link chains for mining applications.

Published
2021

7. Clinical value and molecular mechanism of AQGPs in different tumors

Author

Wang, Rui, primary, Wang, Xuejian, additional, Zhao, Jun, additional, Jin, Jiacheng, additional, Fan, Weiwei, additional, Zhu, Xinqing, additional, Chen, Qiwei, additional, Zhang, Baochang, additional, Lan, Lan, additional, Qu, Kexin, additional, Zhu, Liang, additional, and Wang, Jianbo, additional

Published
2022
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15. Microstructure and Properties of a New Cr – Mn Steel without Boron Additions for Use in Hot Stamping

Author

Chen Qiwei, G. Zhu, Q. Li, and H. Zhou

Subjects
Materials science, Metallurgy, Metals and Alloys, chemistry.chemical_element, Manganese, Hot stamping, Cooling rates, Condensed Matter Physics, Microstructure, Chromium, chemistry, Mechanics of Materials, Metallic materials, Composite material, Ductility, Boron
Abstract

Anew hot-stamping steel that is alloyed with chromium and manganese and does not contain boron additions has been developed. The effect of reheating temperature and cooling rates on the mechanical properties and structure of the steel is determined. Atreatment regime that increases the ductility of the steel without a noticeable decrease in its strength is proposed.

Published
2015

17. Deformation Uniformity of Cold-Rolled Q235 Steel Rebar by FEM in Bending and Rolling Processes

Author

Zhu Guohui, Chen Qiwei, Feng-li Sui, and Bao-dong Liu

Subjects
Materials science, business.industry, Analytic model, Metals and Alloys, Rebar, Process (computing), Bending, Structural engineering, Deformation (meteorology), Finite element method, law.invention, Mechanics of Materials, law, Metallic materials, Materials Chemistry, business
Abstract

An analytic model based on ANSYS/LS-DYNA has been developed on the cold rolling process for Q235 steel rebar with 12 mm in diameter. The elastic-plastic finite element method (FEM) and the cold deformation resistance model of Q235 steel were adopted in this model. Deformation uniformity of the final product has been analyzed using this model. The results indicate that the uniformity of the final product is obtained only as the centerline of the bending rolls is vertical to the centerline of the driven roll and parallel to the centerline of the drive roll in the whole rolling process. Besides, the number of the bending rolls must even realize the continuous bending and reverse bending process. Also, the number of the bending rolls must match the deformation degree of the workpiece in the cold rolling process. The validity of this finite element model was verified by the size and distribution of grains from the billet to the rebar in a practical cold rolling process.

Published
2012

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