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Microstructure and Mechanical Properties of Semi-co.tinuous Equal-channel Angular Extruded Interstitial-free steel

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Journal of iron and steel Research International 2016年第2期23卷 160-165页

作者： Bo YAN Si-hai JIAO Dian-hua ZHANG State Key Laboratory of Rolling and Automation Northeastern University Research and Development Center Baoshan Iron and Steel Co.Ltd.

An innovative method called semi-co.tinuous equal channel angular extrusion （SC-ECAE） has been devel- oped to produce ullrafine grained steel by inducing severe plastic deformation. In co.trast to the external forces that are exerted on specimens in traditional ECAE, the driving forces are applied on the dies in the novel SC EACE process. co.mercial interslitial-free steel sheets with width of 160 mm and tbickness of 2 mm were processed re peatedly to various passes at room temperature using this method. The microstructural evolution was characterized using high-resolution electron backscatter diffraction （EBSD）, and the mechanical properties were investigated by tensile testing. The EBSD images indicated that the fraction of high angle boundaries （HABs） began to increase gradually after four passes; after six passes, elongated HAB structures with nearly submicron-scale average spacings were formed. The tensile testing results showed that strengthening was acco.panied by a decrease in tensile ductili- ly, but no significant anisotropy was observed. After 10 passes, a final HAB fraction of about 90% and an overall grain size of 0.55 μm, yield strength of 638.7 MPa, an ultimate tensile strength （UTS） of 710.3 MPa, and a totfd elongation of 12.0 % were obtained.

关键词： severe plastic deformation semi-co.tinuous equal channel angular extrusion IF steel ultrafine grainedstructure EBSD

Effects of Operation co.ditions on Service Life of Ladle Lining

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China's Refractories 2013年第1期22卷 12-16页

作者： TIAN Shouxin YU Yanwen Baoshan iron & steel co. Ltd.

Effects of operation co.ditions such as ladle temperature, remining time of molten steel, slag basicity, slag oxidation, slag visco.ity , vacuum treatment, ultra-high temperature, gas blowing and stirring, intermittent operation, and different refining equipment on service life of ladle lining refractories were researched. The following co.clusions are drawn ：（1） molten steel temperature rising, remaiaing time prolonging, slag oxidation ability enhancing, slag visco.ity and basicity decreasing can aecelerate the co.rosion of ladle lining ; （2） ultra-high temperature and vacuum treatment of ladle not only acceler- ate the fusion co.rasion of ladle lining, but also make the carbon co.taining refractories react forming gases leading to more co.rosion, so carbon co.taining refractories are not *** the smelting co.ditions of long term vacuum treatment and ultra-high temperature, especially carbon co.taining refractories added with co.ventional additives such as A1 and Si powders ; （ 3 ） argon blowing does not accelerate the co.rosion of ladle lining obvioasly, but oxygen blowing does; （4） the co.rosion degree of refractories varies with the refining equipment, and the service life of ladle lining decreases acco.ding to a certain proportion with the refining ratio increasing.

关键词： operation co.dition service life ladle lining

Effect of cathodic potential on stress co.rosion cracking behavior of different heat-affected zone microstructures of E690 steel in artificial seawater

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Journal of Materials Science & Technology 2021年第5期64卷 141-152页

作者： Yong Li Zhiyong Liu Endian Fan Yunhua Huang Yi Fan Bojie Zhao National Materials co.rosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Jiangsu key laboratory for premium steel material Nanjing Iron&Steel United Co.Ltd.Nanjing 210035China

In this work,the stress co.rosion cracking(SCC)behavior of E690 steel base metal(BM)and different heat-affected zone(HAZ)microstructures,i.e.,co.rse grain HAZ(CGHAZ),fine grain HAZ(FGHAZ),and intercritical HAZ(ICHAZ),was investigated at different cathodic potentials in artificial seawater by slow strain rate tensile tests,scanning electron microsco.y and electron back-scattered diffraction *** results show that the HAZ microstructures and BM exhibit different SCC susceptibilities:FGHAZco.trolled by anodic dissolution(AD)at the open circuit *** the cathodic potential equaling to-750 mV,the SCC susceptibility of the four microstructures increases because of the synergistic effect of AD and weak hydrogen embrittlement(HE).At-850 mV,AD is inhibited,and the SCC susceptibility of BM decreases,while the SCC susceptibility of the HAZ microstructures *** a potential below-850 mV,the SCC susceptibility of the four microstructures gradually increases because of the augment of HE,and the SCC susceptibility of the HAZ microstructures is higher than that of *** distinction reveals that the HAZ microstructures have the greater HE susceptibility than BM.

关键词： Low-carbon bainite steel Heat-affected zone microstructure Cathodic potential Stress co.rosion cracking Hydrogen embrittlement

Effects of pre-strain and baking parameters on the microstructure and bake-hardening behavior of dual-phase steel

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International Journal of Minerals,Metallurgy and Materials 2014年第8期21卷 766-771页

作者： Chun-fu Kuang Shen-gen Zhang Jun Li Jian Wang Hua-fei Liu School of Materials Science and Engineering University of Science and Technology Beijing Research Institute Baoshan Iron and Steel Co. Ltd.

In a typical process, C-Mn steel was annealed at 800℃ for 180 s, and then co.led rapidly to obtain the ferrite-martensite microstructure. After pre-straining, the specimens were baked and the co.responding bake-hardening （BH） values were determined as a function of pre-strain, baking temperature, and baking time. The influences ofpre-strain, baking temperature and baking time on the microstructure evolution and bake-hardening behavior of the dual-phase steel were investigated systematically. It was found that the BH value apparently increased with an increase in pre-strain in the range from 0 to 1%; however, increasing pre-strain from 1% to 8% led to a decrease in the BH value. Furthermore, an increase in baking temperature favored a gradual improvement in the BH value because of the formation of co.trell atmosphere and the precipitation of carbides in both the ferrite and martensite phases. The BH value reached a maximum of 110 MPa at a baking temperature of 300℃. Moreover, the BH value enhanced significantly with increasing baking time from 10 to 100 min.

关键词： dual-phase steel pre-strain baking treatment microstructure hardening

Strengthening Mechanisms for Ti-and Nb-Ti-micro-alloyed High-strength steels

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Journal of iron and steel Research International 2016年第4期23卷 350-356页

作者： Chuan-feng MENG Yi-de WANG Ying-hui WEI Bin-qing SHI Tian-xie CUI Yu-tian WANG School of Materials Science and Engineering Taiyuan University of Technology Technology Center Taiyuan Iron & Steel(Group)Co.Ltd.

The strengthening mechanisms of hot-rolled steels micro alloyed with Ti （ST-TQS00） and Nh Ti （NT TQ500） were investigated by examining the microstructures of steels using optical microsco.e （OM）, scanning elec tron microsco.e （SEM） and transmission electron microsco.e （TEM）. The results revealed ahnost no differences in the solute solution strengthening and fine grained strengthcning of the two steels, whereas the co.tributions of pre cipitation strengthening and dislocation strengthening were different for ST-TQ500 and NT-TQ500. The measured precipitation strengthening effect of ST-TQ500 was 88 MPa higher than that of NT-TQ500： this difference was pri marily attributed to the stronger precipitation effect of thc Ti-co.taining nanoscale particles. The dislocation strengthening effect of ST TQ500 was approximately 80 MPa lower than that of NT-TQ500. This is tbought to be related to differences in deformation behavior during the finishing rolling stage; the inhibition of dynamic recrystallization from Nb in NT-TQ500 （Nb-Ti） may lead to higher density of dislocations in the microstructure.

关键词： micro alloying titanium niobium high-strength steel strengthening mechanism

Grain Refi ning of Flange Plate for Welded H Section steel Made under Asynchronous Rolling co.dition

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Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1121-1127页

作者：戴辉 Research Institute of Metallurgical Engineering University of Science & Technology Beijing Tangshan iron & steel Design & Research Institute co. Ltd.Hebei Iron & Steel Group

Asynchronous rolling technology was adopted for the accumulated ten passes co.d rolling, flange plate steel, and for welded H section steel, respectively. The metallographic microstructure analysis, tensile test and annealing test were carried out for co.d rolled pieces; thus the ratio of length to width of grain, tensile strength, relationship between the grain size and asynchronous rolling process parameters after annealing can be obtained. The experimental results show that the relationship between the asynchronous rolling and the shearing deformation of rolled pieces can make a reasonable interpretation of the mechanism that asynchronous rolling may improve the strain accumulated energy of rolled pieces and the strength of flange plate steel. This paper provides a theoretical basis for the application of asynchronous rolling in improving the strength of flange plate steel.

关键词： asynchronous rolling additional shear strain grain refinement

Formation and co.trol of the surface defect in hypo-peritectic steel during co.tinuous casting:A review

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International Journal of Minerals,Metallurgy and Materials 2023年第12期30卷 2281-2296页

作者： Quanhui Li Peng Lan Haijie Wang Hongzhou Ai Deli Chen Haida Wang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Research Institute Nanjing Iron and Steel Co.Ltd.Nanjing 210044China School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China Technology Center Fushun Special Steel Co.Ltd.Fushun 113001China Center of Technology&Quality Jianlong Beiman Special Steel Co.Ltd.Qiqihar 161041China

Hypo-peritectic steels are widely used in various industrial fields because of their high strength,high toughness,high processability,high weldability,and low material ***,surface defects are liable to occur during co.tinuous casting,which includes depression,longitudinal cracks,deep oscillation marks,and severe level fluctuation with slag *** high-efficiency production of hypo-peritectic steels by co.tinuous casting is still a great challenge due to the limited understanding of the mechanism of peritectic *** work reviews the definition and classification of hypo-peritectic steels and introduces the formation tendency of co.mon surface defects related to peritectic *** achievements in the mechanism of peritectic reaction and transformation have been ***,co.ntermeasures to avoiding surface defects of hypo-peritectic steels duiring co.tinuous casting are *** certain points in the co.tinuous casting of hypo-peritectic steels and the development of new techniques to overco.e the present problems will be a great aid to researchers.

关键词： hypo-peritectic steel co.tinuous casting surface defect massive transformation grain co.rsening depression longitudinal crack level fluctuation oscillation mark

Hot metal quality monitoring system based on big data and machine learning

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Journal of iron and steel Research International 2023年第5期30卷 915-925页

作者： Ran Liu Zhi-feng Zhang Xin Li Xiao-jie Liu Hong-yang Li Xiang-ping Bu Jun Zhao Qing Lyu co.lege of Metallurgy&Energy North China University of Science and TechnologyTangshan 063009HebeiChina Hangzhou Pailie Technology co. Ltd.Hangzhou 310000ZhejiangChina Hebei iron and steel Group Tangshan Iron and Steel Co.Ltd.Tangshan 063009HebeiChina

The system of hot metal quality monitoring was established based on big data and machine learning using the real-time production data of a steel enterprise in China.A working method that co.bines big data technology with process theory was proposed for the characteristics of blast furnace production *** the data have been co.prehensively processed,the independent variables that affect the target parameters are selected by using the method of multivariate feature *** use of this method not only ensures the interpretability of the input variables,but also improves the accuracy of the machine learning process and is more easily accepted by *** timely guidance on production,specific evaluation rules are established for the key quality that affects the quality of hot metal on the basis of co.pleted predictions work and uses co.puter technology to build a quality monitoring system for hot *** online results show that the hot metal quality monitoring system established by relying on big data and machine learning operates stably on site,and has good guiding significance for production.

关键词： Hot metal Big data Machine learning Quality monitoring Feature engineering

Improvement of Sinter Properties With Ultra Fine-Sized iron co.centrate by HPRG

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Journal of iron and steel Research International 2013年第9期20卷 47-52页

作者： FAN Jian-jun QIU Guan-zhou JIANG Tao GUO Yu-feng MU Ke-lang School of Minerals Processing and Bioengineering Central South University Taiyuan iron and steel(Group)co. Ltd.

The experiments were co.ducted on the changes of sintering performance of one kind of ultra fine-sized iron co.centrate with or without being processed by high pressure roll grinding （HPRG）. The experimental results indi eate that the specific surface area increases from 1723.0 to 2 201.6 cm^2/g when the iron co.centrate is processed by HPRG. The permeability of sintering mix increases and the iron co.centrate beco.es easy to react with CaO reagent at high temperature. The effect gets intensified when iron co.centrate and lime are processed together By HPRG. The further studies indicate that co.pared with the base case, the sinter quality also gets improved, in which the yield of sinter increases from 67.24% to 69.52% and further to 71.68%, the tumble index （TI） increases from 60.38% to 62.13% and further to 64.45%, and the productivity increases from 1.42 to 1.57 t/（m^2 · h） and further to 1.62 t/（m^2 · h） when the iron co.centrate is processed by HPRG or is processed with lime together. The metallurgical properties of sinter also get improved when the iron co.centrate is pretreated by high pressure roll. The results indicate that it is co.ducive to the increase of sinter quality and productivity when the iron co.centrates are processed by HPRG.

关键词： iron co.centrate lime HPRG permeability sinter