Search

Your search keyword '"Zhai, Qijie"' showing total 596 results
Start Over Author "Zhai, Qijie"
596 results on '"Zhai, Qijie"'

36. Evolution of Electromagnetic Fields and Forced Flow in a Metal Melt under the Impact of Hot‐Top Pulsed Magneto‐Oscillation.

Author

Zhou, Yulan, Chen, Gang, Zhang, Yunhu, Wang, Junjie, Xu, Yanyi, Song, Changjiang, Zheng, Hongxing, and Zhai, Qijie

Abstract

Hot‐top pulsed magneto‐oscillation (HPMO) is developed as a novel approach to achieve grain refinement and solute homogenization in heavy steel ingots. Through a combination of numerical simulations and melt flow measurements, this study investigates the evolution of electromagnetic fields and forced flow within alloy melts under the influence of HPMO, with a focus on varying electromagnetic parameters such as electric current intensity, frequency, and pulse length. The results of the simulations reveal the formation of double‐circulating flows in opposite directions within the melt. Experimental measurements of the flow field distribution closely align with the simulation outcomes. Furthermore, it is observed that the induced magnetic field inside the melt changes direction once, and the electromagnetic force changes direction three times within a single pulse length period under the influence of HPMO. Notably, the radial electromagnetic force, directed toward the interior of the melt, surpasses the normal electromagnetic force away from the melt. This phenomenon leads to a stable flow of the melt, contributing to grain refinement. The findings presented in this study offer valuable insights into the use of HPMO as a promising technique for improving the quality of heavy steel ingots. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

47. Optimization of Process Parameters for 40Cr Steel Continuous Casting Round Bloom with Pulsed Magneto‐Oscillation Treatment.

Author

Yang, Yang, Chen, Yongfeng, Zhang, Hongbiao, Yin, Zihao, Liu, Haining, Li, Renxing, Li, Lijuan, Xu, Zhishuai, Zhong, Honggang, and Zhai, Qijie

Subjects
CONTINUOUS casting, STEEL founding, CAST steel, ELECTROMAGNETIC fields, SOLIDIFICATION
Abstract

To reduce the solidification structure defects and the macrosegregation of the Φ300 mm continuous casting round bloom, the pulsed magneto‐oscillation (PMO) treatment is added at the secondary cooling zone. A numerical model for calculating the pulsed electromagnetic field, flow field, and temperature field in continuous casting is established, and the coupling simulations of multiphysical fields under different casting parameters and PMO parameters are performed. Their influence on solidification process and the appropriate parameters are discussed. The industrial experiments conducted under the recommended parameters yield good results. Industrial experiments show that when the peak current is increased from 1350 to 1550 KIA and the casting speed is increased from 0.75 to 0.90 m min−1, PMO can increase the equiaxed grain zone and reduce the carbon macrosegregation of the bloom. Moreover, at high casting speed, PMO treatment can significantly promote columnar‐to‐equiaxed transition and increase the width of mixed grain zone. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

50. A Study on the Size and Type of Inclusions in Si–Mn Combined Deoxidated Low Carbon Steel Strip

Author

Wang, Ting, Bao, Wenqiang, Zheng, Shaobo, Zhai, Qijie, Li, Huigai, Ikhmayies, Shadia, editor, Li, Bowen, editor, Carpenter, John S., editor, Li, JIan, editor, Hwang, Jiann-Yang, editor, Monteiro, Sergio Neves, editor, Firrao, Donato, editor, Zhang, Mingming, editor, Peng, Zhiwei, editor, Escobedo-Diaz, Juan P., editor, Bai, Chenguang, editor, Kalay, Yunus Eren, editor, Goswami, Ramasis, editor, and Kim, Jeongguk, editor

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results