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Journal of Materials Science & Technology 2021年第2期61卷 147-158页

作者： Qiang Ren Yuexin Zhang Ying Ren Lifeng Zhang Jujin Wang Yadong Wang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

In the current study, the transformation in the composition of non-metallic inclusions from the molten steel to the solidified steel was studied and the composition distribution of inclusions on the cross section of a linepine continuous casting slab was predicted. During cooling and solidification of the continuous casting strand, Al_(2)O_(3)-CaO inclusions reacted with the bulk steel and transformed to CaS-Al_(2)O_(3)-MgO-(CaO) ones in the continuous casting slab. The composition of inclusions on the cross section of the slab varied with locations due to the varied cooling rate. A model was established to predict the distribution of the composition of inclusions on the cross section of the continuous casting slab, coupling solidification and heat transfer of the continuous casting slab, the kinetic mass transfer of the dissolved elements in the solid steel, and thermodynamic calculation of inclusion transformation at different temperatures. The composition transformation of inclusions mainly occurred at the temperature between the liquidus and solidus of the linepipe steel. Inclusions were mainly CaS-Al_(2)O_(3)-MgO-(CaO) in slab center and were MgO-Al_(2)O_(3)-CaO-CaS within the subsurface of the slab. In the slab, the transformation fraction of inclusions was less than 10 % at corners while it reached 70 % at 50 mm below the surface of the slab.

关键词： Inclusions Linepipe steel continuous casting slab Mass transfer Thermodynamics Kinetics

Study Segregation of Alloying Elements in continuous casting slab with Valence Electron Structure

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Journal of Materials Science & Technology 2004年第4期20卷 421-425页

作者： YahLIU ZhilinLIU ChengweiZHANG YingguangZHU CollegeofScience NortheasternUniversityShenyang110004China LiaoningInstituteofTechnology Jinzhou121001China ChinaNationalOilandGasExplorationandDevelopmentCorporation Beijing100011China

By calculating the electron structures of the phases that phosphor, sulfur and alloying elements dissolving inγ-Fe, the reason why alloying elements can bring centerline segregation in continuous casting slab (CCS) with nA, the number of electrons on the strongest covalent bonds, and the structure formation factor S were investigated, and an electron structural criterion to control and to eliminate the centerline segregation was advanced. Basing on this, the electron structures of a part of rare earth phosphides and sulfides are calculated, the physical mechanism that rare earth elements can control the segregation of phosphor and sulfur is analyzed, and the criterion is well verified.

关键词： Valence electron structure continuous casting slab Centerline segregation Rare-earth elements.

INVESTIGATION ON HOT DUCTILITY AND STRENGTH OF continuous casting slab FOR AH32 STEEL

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Acta Metallurgica Sinica(English Letters) 2006年第1期19卷 75-78页

作者： G. Y. Li X.F. Li L.G. Ao Technology Center Anshan Iron and Steel Group CorporationAnshan 114009 China

By means of Gleeble-1500 testing machine, the simulation of continuous casting process forAH32 steel was carried out and hot ductility and strength were determined. The cracking sensitivity was studied under the different temperatures and strain rates. The Precipitations of AIN at different temperatures and the fractures of high-temperature tensile samples were observed by using TEM （transmission electron microscope） and SEM （scanning electron microscope）. The factors affecting the brittle temperature zone were discussed.

关键词： continuous casting slab brittle temperature zone tensile strength,ductility simulation

Longitudinal crack on slab surface at straightening stage during continuous casting using finite element method

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Journal of Central South University 2010年第2期17卷 235-238页

作者：喻海良刘相华 State Key Laboratory of Rolling and Automation Northeastern University Department of Mechanical Engineering Tsinghua University

Deformation behavior of slab at the straightening stage during continuous casting was simulated by the explicit dynamic finite element method,and the stress distribution along the width direction of the slab and its change regularity at slab center during continuous casting were *** influence of distribution and change of stress on the propagation of longitudinal cracks on slab surface was *** results show that the tensional stress appears on slab surface at the inner arc side and the compressive stress appears on slab surface at the outer arc side at stages 6-8 in straightening zone during continuous *** cracks generally appear on slab top surface and do not appear on slab bottom surface,which are also observed in industry.

关键词： continuous casting slab straightening longitudinal crack finite element method

Strain in solidifying shell of continuous casting slabs

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Journal of University of Science and Technology Beijing 2003年第6期10卷 26-29页

作者： Guosen Zhu, Xinhua Wang, Huixiang Yu, and Wanjun WangMetallurgical Engineering School, University of Science and Technology Beijing, Beijing 100083, China Metall. Eng. Sch. Univ. of Sci. and Technol. Beijing Beijing 100083 China

Two-dimension unsteady heat transfer model was applied to obtain the surfacetemperature and the shell thickness of continuous casting slabs during the process ofsolidification. On the basis of which, the mathematical model of strain at the interface of solidand liquid steel was set up. Through which, the strain in the solidifying shell under normal andabnormal operation conditions was gained. The results indicate that the strain is small under thenormal operation conditions and the internal crack never happens. However, when the variation of theroll gap is above 2 mm, the strain caused by which is greater than that caused by ***, the total strain exceeds the critical one and the internal crack is the result. So itis of great importance to maintain the fine state of continuous casting machine to avoid theappearance of internal crack.

关键词： internal crack strain bulging unbending continuous casting slab

Surface Detection of continuous casting slabs Based on Curvelet Transform and Kernel Locality Preserving Projections

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Journal of Iron and Steel Research International 2013年第5期20卷 80-86页

作者： AI Yong-hao XU Ke National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing

Longitudinal cracks are common defects of continuous casting slabs and may lead to serious quality accidents. Image capturing and recognition of hot slabs is an effective way for on-line detection of cracks, and recognition of cracks is essential because the surface of hot slabs is very complicated. In order to detect the surface longitudinal cracks of the slabs, a new feature extraction method based on Curvelet transform and kernel locality preserving projections （KLPP） is proposed. First, sample images are decomposed into three levels by Curvelet transform. Second, Fourier transform is applied to all sub-band images and the Fourier amplitude spectrum of each sub-band is computed to get features with translational invariance. Third, five kinds of statistical features of the Fourier amplitude spectrum are computed and combined in different forms. Then, KLPP is employed for dimensionality reduction of the obtained 62 types of high-dimensional combined features. Finally, a support vector machine （SVM） is used for sample set classification. Experiments with samples from a real production line of continuous casting slabs show that the algorithm is effective to detect longitudinal cracks, and the classification rate is 91.89%.

关键词： surface detection continuous casting slab Curvelet transform feature extraction kernel locality preserving projections

Research on the trajectory of non-metal inclusions with the flow in the mold during the solidification of continuous casting slabs

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Baosteel Technical Research 2011年第1期5卷 51-55页

作者： LIU Xufeng ZHENG Hongguang WANG Yan Metallurgical Process Division Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

By means of the numerical simulation method,the mathematical model of inclusions movement in the mold is established under the condition of austenitic and fen-itic stainless steel slab production. According to the simulation results, the main zones for inclusion particles accumulation were found and many factors that affected floating-up probability of inclusion particles were identified. These factors include the inclusion particle size, the casting speed and the slab width, etc. It is believed that the inclusion particle size is the key one among these factors.

关键词： stainless steel continuous casting slab inclusion flow field numerical simulation

Correlation between longitudinal crack occurrence and mold heat transfer in continuous casting based on process data mining

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Journal of Iron and Steel Research International 2024年第5期31卷 1139-1152页

作者： Zhi-qiang Peng Zi-bing Hou Kai Yi Kun-hui Guo Dong-wei Guo Guang-hua Wen College of Materials Science and Engineering Chongqing UniversityChongqing400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing400044China

The correlation between the longitudinal crack occurrence and integrated heat transfer of the mold with data mining methods was ***,three kinds of support vector machine models based on principal component analysis with different input features were established to explore the effect of integrated heat transfer on the accuracy of the prediction model for the longitudinal *** results show that the accuracy was improved while features including mean and standard deviation of integrated heat transfer were ***,the difference in integrated heat transfer between defect and normal samples under the same process parameters was quantitatively *** with normal samples,the temperature difference of cooling water for defect samples decreased by 0.65%,and the temperature difference fluctuation increased by 31.1%.Finally,the literature data were used to provide support for the quantitative correlation according to defect formation mechanism.A new criterion for the prediction of longitudinal crack and a discovering method for correlation between product quality and process parameters in the manufacturing industry have been provided.

关键词： continuous casting slab Longitudinal surface crack Heat transfer Data mining Quantitative correlation

High-Temperature Mechanical Properties of Shipbuilding Steel BC in continuous casting

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Journal of Iron and Steel Research International 2011年第S1期18卷 605-609页

作者： DONG Zhi-hua,CHEN Deng-fu,SONG Li-wei,HU Hui,YANG Xing-lei (College of Materials Science and Engineering,Chongqing University,Chongqing 400030,China) Chongqing Univ Coll Mat Sci & Engn Chongqing 400030 Peoples R China

The mechanical property of shipbuilding steel BC has been studied by means of tensile test at various temperatures from 700 ℃ to 1000℃ with theGleeble-1500D thermo-mechanical *** results indicate that the yield strength and tensile strength of steel have an analogous change pattern as temperature decreasing,and the transition in variation rate of strength occurs at 800℃ in both of them;the hot ductility trough of steel BC is a temperature range from 725℃ to 800℃,while the best hot ductility ranges from 875℃ to 1000℃ with the ductility value over 80%.For the sake of understanding the fracture mechanism of the steel,fracture surface and microstructure of the specimens have been examined by scanning electron microscope and metalloscope *** results show that both the second phase particles and the pro-eutectoid ferrite surrounding the austenite boundaries play a significant role to the variation of hot ductility of steel ***,the research is important to the improvement and the further studies on the quality of steel during slab continuous casting process.

关键词： continuous casting slab mechanical property hot ductility microstructure