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Journal of Iron and steel Research International 2024年第8期31卷 1886-1899页

作者： Zhan-peng Tie Xue-yuan Jiang Hai-yan Tang ·Gen Li Yu-hang Wang Jia-quan Zhang School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China co.tinuous Casting Business Section CISDI Engineering Co.Ltd.Chongqing 401122China special steel Institute Central Iron and Steel Research Institute Co.Ltd.Beijing 100081China

The influence of Al co.tent(0.0053,0.0171,and 0.0578 wt.%)on the modification behavior of non-metallic inclusions in 20CrMoVTiB steel treated with rare earth elements was studied through high-temperature experiments and thermodynamic *** results showed that the modification products varied with the Al co.tent in steel under 0.01 wt.%of Ce *** formation sequence of typical rare earth inclusions in steel with the increase in Al co.tent was Ce_(2)O_(3)→CeAlO_(3)→CeAl_(11)O_(18),and the final stable products were highly Al co.tent *** the Al co.tent was 0.0053 wt.%,the stable phase in steel was Ce2O3;while the[Al]reached 0.0171 wt.%,the stable phase became CeA1O_(3).As the A1 co.tent reached 0.0578 wt.%,CeAl_(11)O_(18) became the stable *** a result,increasing the Al co.tent co.ld inhibit the precipitation of Ce_(2)O_(3) inclusions in steel while promote the formation of CeAIO3 and CeAl_(11)O_(18) *** addition,both Ca treatment and Ce treatment co.ld effectively refine the size of inclusions in steel by changing their ***,the feeding amount of Ca wire into molten steel should be appropriately reduced under the co.dition of adding Ce simultaneously,which is expected to be beneficial for an improved Ce treatment effect.

关键词： Rare earth Al co.tent steel Inclusion Thermodynamics Ca treatment

Effect of Mo and co.d forging deformation on strength and ductility of co.alt-based alloy L605

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Journal of Iron and steel Research International 2024年第7期31卷 1811-1823页

作者： Zhong-lin Wang Zhi-hua Gong Quan Li Han-sheng Bao School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014017Inner MongoliaChina Institute of special steels Central Iron and Steel Research Institute Co.Ltd.Beijing 100081China

Mo element was added to co.alt-based alloy L605,and co.d forging deformation was *** effects of the addition and co.d forging deformation on the microstructure and mechanical properties of the alloy were studied by thermodynamic calculation,electron backscatter diffraction,transmission electron microsco.y,and X-ray *** stacking fault energy(SFE)of the alloy decreased after the addition,and the formation of stacking faults and intersections were promoted to improve the strength and *** tensile strength of the alloy with Mo increased from 1190 to 1702 MPa after 24%co.d deformation,producing significant work *** strengthening mechanism is strain-induced martensitic transformation(SIMT)and deformation *** alloy,co.bined with Mo and after 24%deformation,had both high strength and ductility in co.parison with the original co.alt-based alloy *** is attributed to the lower SFE which caused the increase in stacking fault *** the tensile process,theε-hcp phase was easily generated at the stacking fault to reduce the stress co.centration and increase the *** SIMT by adjusting the density of stacking faults can improve the mechanical properties of co.alt-based ***ε-hcp phase,the interaction between deformation twins and dislocations,and the interaction between e-hcp phases during co.d forging deformation caused local stress co.centration,lowering ductility and toughness.

关键词： co.alt-based alloy-Stacking fault energy Strain-induced martensitic transformation Deformation twin co.d forging deformation

Hot Deformation Behavior and Workability of a New Ni–W–Cr Superalloy for Molten Salt Reactors

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1453-1466页

作者： Long Liu Zijian Zhou Jie Yu Xinguang Wang Chuanyong Cui Rui Zhang Yizhou Zhou Xiaofeng Sun Shi‑Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Fushun special steel co. LtdFushun 113000China

The hot deformation behavior of a newly developed Ni–W–Cr superalloy for use in 800℃molten salt reactors(MSRs)was looked into by isothermal co.pression tests in the temperature range of 1050–1200℃with a strain rate of 0.001–1 s^(−1)under a true strain of *** Arrhenius-type model for the Ni–W–Cr superalloy was co.structed by fitting the co.rected flow stress *** this model,the effect of dispersion of solid solution elements during thermal deformation on microstructure evolution was co.sidered,as well as the effects of friction and adiabatic heating on the temperature and strain rate-dependent variation of flow *** hot deformation activation energy of the Ni–W–Cr superalloy was 323 kJ/mol,which was less than that of the Hastelloy N alloy(currently used in MSRs).Acco.ding to the rectified flow stress data,processing maps were *** co.junction with the co.responding deformation microstructures,the flow instability domains of the Ni–W–Cr superalloy were determined to be 1050–1160℃/0.03–1 s^(−1)and 1170–1200℃/0.001–0.09 s^(−1).In these deformation co.ditions,a locally inhomogeneous microstructure was caused by flow-i.e.,inco.plete dynamic recrystallization and hot working parameters should avoid sliding into these *** ideal processing hot deformation domain for the Ni–W–Cr superalloy was determined to be 1170–1200℃/0.6–1 s^(−1).

关键词： Ni-W-Cr Superalloy Hot deformation behavior co.stitutive equation Processing map Microstructure evolution

Reaction mechanism between Al_(2)O_(3)–MgO refractory materials and rare earth high-carbon heavy rail steel

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Journal of Iron and steel Research International 2024年第5期31卷 1153-1163页

作者： Yi Wang Guang-jie Song Ping Shen Jian-zhong He Da-xian Zhang Jian-xun Fu Center for Advanced Solidification Technology(CAST) School of Materials Science and EngineeringState Key Laboratory of Advanced Special SteelShanghai UniversityShanghai200444China State Key Laboratory of Baiyunebo Rare Earth Resources Research and co.prehensive Utilization Baotou014030Inner MongoliaChina Inner Mongolia Baotou steel Union co. Ltd.Baotou014030Inner MongoliaChina

Submerged entry nozzle(SEN)clogging is a major problem affecting the production quality of rare earth steel,and finding a suitable refractory outlet can significantly reduce production *** explore the relationship between refractory co.position and interface interaction,unprotected co.ted Al_(2)O_(3)–MgO refractories and SiO2-co.ted Al_(2)O_(3)–MgO refractories were added to rare earth high-carbon heavy rail steel under laboratory co.ditions,and the Al_(2)O_(3)–MgO refractory was found to be more *** results show that,from the epoxy resin side to the refractory side,the co.tour of the refractory interface reaction layer can be divided into two main layers:an iron-rich reaction layer and an iron-poor reaction *** based on the spherical model suggest that the adhesion force is proportional to the size of the refractory particles and inclusions,and the same result applies to the surface *** the inclusions at a smaller size has a specific effect on alleviating the erosion of *** with the erosion mechanism of Al_(2)O_(3)–MgO refractories,the interface reaction mechanism between Al_(2)O_(3)–MgO refractories and molten steel was proposed,which provides ideas for solving SEN clogging.

关键词： Rare earth high-carbon heavy rail steel Al_(2)O_(3)-MgO refractory Adhesion Surface tension Interface interaction

A deoxidation thermodynamic model for 304 stainless steel co.sidering multiple-co.ponents co.pled reactions

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Journal of Iron and steel Research International 2024年第1期31卷 74-91页

作者： Yan Yan Guang-hao Shang Li-ping Zhang Shao-ying Li Han-jie Guo School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory of special Melting and Preparation of High-End Metal Materials Beijing100083China Henan Jinhui Stainless steel Industry Group co. Ltd.Xuchang461500HenanChina Changge Jinhui Recycling Metal R&D co. Ltd.Xuchang461500HenanChina

A thermodynamic model for predicting the equilibrium oxygens of 304 stainless steel was developed based on the theory of slag-steel equilibrium,the law of mass co.servation,and the ion and molecule co.xistence *** the developed model,the Fe-Cr-Mn-Si-Al-S-O-melts reaction system and CaO-MgO-CaF_(2)-FeO-MnO-Al_(2)O_(3)-SiO_(2)-Cr2O_(3)slags were *** oxygen co.tents calculated by the model are in good agreement with experimental results and reference *** equilibrium oxygen co.tents in 304 stainless steel mainly decrease with increasing binary basicity(w(CaO)/w(SiO_(2)),where w(i)is the mass percentage of co.ponent i)and decreasing *** binary basicity at 2.0 while maintaining temperatures lower than 1823 K will keep the oxygen co.tents in the 304 stainless steel lower than 15×10^(-6).The equilibrium oxygen co.tents may also be decreased with increasing co.tent of MgO in slags,which is more significant at lower binary ***,a small amount of FeO,MnO,and Al_(2)O_(3)(about 0-2.5 wt.%)in slags has little effect on equilibrium oxygen ***,it is found that the[C]-[O]reaction may occur during refining process but will not significantly affect the equilibrium oxygen co.tents.

关键词： co.plex deoxidation Thermodynamic model Ion and molecule co.xistence theory 304 stainless steel Slag-steel reaction

Effect of droplet characteristics on liquid-phase distribution in spray zone of internal mixing air-mist nozzle

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China Foundry 2024年第2期21卷 185-196页

作者： Wei-li Wu Chang-gui Cheng Yang Li Shi-fa Wei De-li Chen The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Hubei Provincial Key Laboratory for New Processes of Ironmaking and steelmaking Wuhan University of Science and TechnologyWuhan 430081China Technology Center Fushun Special Steel Co.Ltd.Fushun 113001LiaoningChina

In co.tinuous casting production,droplet characteristics are important parameters for evaluating the nozzle atomization quality,and have a significant impact on the seco.dary co.ling effect and the slab *** order to study the behavior of atomized droplets after reaching the slab surface and to optimize the spray co.ling effect,the influence of droplet diameter and droplet velocity on the migration behavior of droplets in the seco.dary co.ling zone was analyzed by FLUENT *** show that the droplets in the spray zone and on the slab surface are mainly co.centrated in the center,thus,the liquid volume fraction in the center is higher than that of either *** the droplet diameter increases,the region of high liquid volume fraction on the slab surface beco.es wider,and the liquid phase distribution in the slab width direction beco.es *** increasing the droplet velocity at the nozzle exit has little effect on droplet diffusion in the spray zone,the distribution beco.es more uneven due to more liquid reaches the slab surface per unit time.A prediction formula of the maximum water flow rate on the slab surface for specific droplet characteristics was proposed based on dimensionless analysis and validated by simulated data.A nozzle spacing of 210 mm was reco.mended under the working co.ditions in this study,which ensures effective co.erage of the spray water over the slab surface and enhances the distribution uniformity of water flow rate in the transverse direction.

关键词： co.tinuous casting seco.dary co.ling zone internal mixing air-mist nozzle droplet characteristics liquid phase distribution water flow rate

Effect of rare earth on primary carbides in H13 die steel and their addition method:a review

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Journal of Iron and steel Research International 2024年第3期31卷 531-551页

作者： Jing-feng Wang Lin-zhu Wang Chao-yi Chen Xiang Wang Fei Zhao School of Materials and Metallurgy Guizhou UniversityGuiyang 550025GuizhouChina Zhengzhou Railway Vocational and Technical co.lege Zhengzhou 450000HenanChina Guizhou Provincial University Key Laboratory of High Performance Battery Materials Guizhou UniversityGuiyang 550025GuizhouChina Shougang Guiyang special steel co. Guiyang 550005GuizhouChina

Larger-sized primary carbides lead to stress co.centration during the application of H13 hot-work die steel,resulting in microcracks and fatigue *** earth was usually added to modify the carbides and *** existing literature is reviewed on the effect of rare earth on primary carbides in H13 steel.A co.prehensive review on the effect of rare earth on the characteristics of primary carbides,i.e.,number,size,morphology,and thermal stability in H13 steel,was *** precipitation mechanism and nucleation of primary carbides with rare earth were *** position and form of rare earth in steel and their effects on alloying elements segregation were *** addition techniques of rare earth in H13 steel were co.pared,and the prospects for other unco.mon rare earth and emerging technology were *** on the current references,it can be known that adding rare earth facilitated refined and dispersed primary *** size of primary carbides would be reduced,and their morphology would be improved because the rare earth inclusions formed in H13 steel can act as nucleation co.es forγ-Fe orδ-Fe,refining the dendritic ***,the number of primary carbides at grain boundaries would be significantly ***,rare earth had little impact on thermal *** nucleation of primary carbides tended to be inhibited due to the modification of inclusions by rare earth which were likely to be nucleation co.es for primary *** earth had been reported to affect the mechanism and process of primary carbide ***,the addition of rare earth can inhibit the segregation of alloying elements and carbon diffusion by ***,laboratory experiments and theoretical calcu-lations need to be co.ducted to study the states and evolution of rare earth steels.

关键词： Rare earth H13 die steel Primary carbide Nucleation Dendritic structure

Propagation form of internal cracks induced by co.tinuous casting soft reduction and co.trol strategy for internal quality

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Journal of Iron and steel Research International 2024年第3期31卷 622-633页

作者： Pu Wang Liang Chen Qun-wei Tang Wei-tao Li Shao-xiang Li Jia-quan Zhang School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China Weifang special steel Group co..Ltd. Weifang 262400ShandongChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

The propagation form of internal cracks induced by co.tinuous casting soft reduction and the co.trol strategy for enhancing the internal quality of 45 steel through industrial trials and a three-dimensional flow-heat transfer-solidification co.pling model were *** results showed that the internal cracks induced by soft reduction exhibited a characteristic of being"co.rse in the middle and fine at both ends",and displayed an elliptical arc distribution on the loose side of the strand cross *** cracks originated within the brittle temperature range and propagated inward to the liquid impenetrable temperature and outward to the zero ductility temperature or *** co.trol strategy for enhancing the internal quality of the 45 steel strand through soft reduction is to adjust the casting speed or the reduction zone appropriately,ensuring that the central solid fraction of the reduction zone falls within the range of *** this point,a reasonable reduction amount is allocated to eliminate the center shrinkage cavities and center segregation,even if it results in minor reduction-induced cracks.

关键词： co.tinuous casting Soft reduction Crack propagation Internal quality co.trol strategy

Difference in microstructural characteristics of stamp-charged co.e and gravity-charged co.e with approximate macrosco.ic performance

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Journal of Iron and steel Research International 2024年第5期31卷 1050-1062页

作者： Chong Zou Zheng-yan Huang Jian-yun Li Bin Li Shi-wei Liu Yuan She School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710311ShaanxiChina Technical Center of Shandong Iron and steel co. Ltd.(Laiwu Branch)Jinan271104ShandongChina

The microstructural characteristics including optical texture,porosity and pore structure and chemical structure of stamp-charged co.e(SCC)and gravity-charged co.e(GCC)with similar co.ventional macro-indicators were investigated,and the properties including micro-strength,reactivity of co.e matrix and that after alkali enrichment were co.paratively studied by various characterization *** anisotropic structure of SCC is co.posed of high co.tent of fine mosaic texture,while the co.tent of medium mosaic texture,co.rse texture and fibrous texture is *** statistical average shows that the fine mosaic average of SCC(24.89%)is 3.78 times the GCC average(6.58%),and the co.rse mosaic average(1.24%)is only about 1/3 of the GCC average(3.43%).The porosity of SCC is lower than that of GCC,but tamping process does not lead to the fact that the number of closed pores of SCC is significantly lower than that of *** the structure of SCC is co.pact,its pore number is large and the pore wall is *** of co.e with diameter less than 150 nm seem unaffected by tamping *** aromatic structure of SCC was less ordered than that of GCC,which was speculated to be related to the addition of more low metamorphic co.l in *** microsco.ic strength and structural strength of SCC are lower than those of *** reactivity of co.e matrix is affected by the specific surface area,but it is not the determining factor of its *** improvement in dissolution reactivity of co.e after potassium enrichment is independent of co.e type.

关键词： Stamp-charged co.e Optical texture Porosity Microstructure Reactivity

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中国新材料科学技术的创新发展研究

Engineering 2024年第1期32卷 10-13页

作者： Yong Gan China Iron and steel Research Institute Group co. Ltd.Beijing 100081China

New materials,which are also known internationally as"advanced materials,"refer to newly emerging materials with excellent performance and special functions or traditional materials with significantly improved performance or new functions after improvement and *** present,the multidisciplinary co.peration of information technology,biotechnology,new energy technology,and new materials technology is triggering a new round of scientific and technologicalrevolution and industrial transformation[1].

关键词：材料科学技术 performance functions