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Solidification and heat transfer of molten steel slag particles during air quenching process

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Journal of iron and steel Research International 2023年第9期30卷 1834-1842页

作者： Wen-feng Gu Jiang Diao Rui-xin Hu Wen-sun Ge Wen-feng Tan Hong-yi Li Bing Xie college of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium–Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China Institute of Materials Engineering Technology Pangang Group Research Institute Co.Ltd.Panzhihua 617000SichuanChina

In order to effectively utilize the resources and energy of molten steel slag,the variation of precipitation phase and specific heat of air quenched steel slag(AQSS)particles during continuous cooling process was investigated by FactSage and thermogravimetry differential scanning *** cooling and solidification process of molten AQSS particles was simulated by *** microstructure changes in AQSS particles in solidification process were analyzed using an ultrahigh temperature laser confocal microscope and a scanning electron *** results indicated that in the cooling process of molten AQSS particles,the precipitation of Ca_(2)Fe_(2)O_(5) resulted in the largest change of specific *** the condition of slow cooling,the cooling rate is more obviously affected by specific *** the initial air velocity was 300 m s^(-1),there was the highest temperature difference in AQSS particles during cooling *** is more,the compactness of the boundary region of AQSS particles was obviously better than that of its central region.

关键词： Specific heat Air quenched steel slag cooling Solidification Microstructure change

Zrs5.8Al19.4（co1-xCux）24.8 （x = 0-0.8 at.%） bulk metallic glasses for surgical devices applications

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Journal of iron and steel Research International 2018年第6期25卷 644-649页

作者： Kai-ming Han Jian-bing Qiang Ying-min Wang1 Bing-bing Zhao Peter Haussler Key Laboratory of Materials Modification by Laser Ion andElectron Beams (Ministry of Education) Dalian Universityof Technology Dalian 116024 Liaoning China ArcX coating Hub Asia Hoganais (China) Co. Ltd.Shanghai 201799 China Physics Institute Chemnitz University of Technology09107 Chemnitz Germany

Zr-Al-co-Cu bulk metallic glasses （BMGs） are promising surgical materials. By using the electron concentration criterion for BMG composition design, a series of Zr55.8Al19.a（co1-xCux）24.8 （x = 0-0.8 at.%） alloys were produced, of which BMG rod samples with different diameters were made by copper mold casting. Among these alloys, the Zr55.8A119.4co17.36Cu7.44 BMG exhibited a centimeter-scale glass formation size （dmax = 12 mm）, an ultrahigh strength （δy = 2.04 GPa）, a large room-temperature plasticity （εp = 4.0%）, and a fracture toughness （KQ = 120 MPa m^l/2）, as well as good corrosion resistance in phosphate-buffered solution. The attAlnment of the combination of properties as large glass-forming ability with excellent mechanical and corrosion stability would suit the surgical devices applications.

关键词： Zr-Al-co-Cu Bulk metallic glass Biomedical material Mechanical property

Thickness monitoring and discontinuous degradation mechanism of wear lining refractories for refining ladle

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Journal of iron and steel Research International 2022年第7期29卷 1110-1118页

作者： Yan-zhu Huo Hua-zhi Gu Juan Yang Ao Huang Zheng Ma The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina School of computer Science and Technology Wuhan University of Science and TechnologyWuhan 430081HubeiChina Zhejiang Zili High Temperature Technology co. Ltd.Shaoxing 312300ZhejiangChina

As a functional metallurgical container for molten steel,refining ladle has a great influence on the smelting safety and quality of *** online monitoring of the residual thickness for ladle lining was applied to increase the smelting efficiency and *** is found that the ladle refractories show obvious discontinuous degradation characteristics through the monitoring ***,the degradation of low-carbon magnesia–carbon brick at slag line and corundum-based castable at steel bath was calculated according to the established corrosion model and crack propagation model,*** discontinuous degradation mechanism of the ladle refractories is illustrated,which is of great significance to the optimal configuration of the ladle lining refractories.

关键词： Refining ladle Refractory Discontinuous degradation Monitoring Modeling

complete stabilization of severely As-contaminated soil by a simple H2O2 pre-oxidation method combined with non-toxic TMT-15 and FeCl3·6H2O

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1105-1112页

作者： Chang-sheng Yue Ben Peng Wei Tian Guang-hua Lu Gui-bo Qiu Mei Zhang Central Research Institute of Building and construction co. Ltd.Metallurgical Corporation of China Group (MCC Group)Beijing 100088China National Engineering Research Center for Industrial Environmental Protection Beijing 100088China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The stabilization of severely As-polluted soil has been a challenge, especially for the extremely toxic As(Ⅲ) contaminants. In this study, soil with a high As concentration(26084 mg/kg) was availably stabilized by a H2O2 pre-oxidation assisted TMT-15(Na3S3C3N3 solution with a mass fraction of 15%) and FeCl3·6 H2O stabilization method. The results showed that the combination of the two stabilizers(i.e., TMT-15 and FeCl3·6 H2O) presented a better stabilization behavior than either stabilizer used individually. The use of the H2O2 pre-oxidation assisted TMT-15 and FeCl3·6 H2O stabilization approach not only converted the As(Ⅲ) to As(Ⅴ) but also reduced the toxic leaching concentration of As to 1.61 mg/L, which is a safe level, when the additions of TMT-15 and FeCl3·6 H2O were 2 mL and 0.20 g, respectively. Thus, using only a simple H2O2 pre-oxidation to combine clean stabilization with non-toxic stabilizers TMT-15 and FeCl3·6 H2O could render the severely As-contaminated soil safe for disposal in a landfill.

关键词： severely As-contaminated soil non-toxic stabilizers combining stabilization pre-oxidation

Improvement of proof-ultimate strength difference in laser additive manufactured Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si alloy by tuning basketweave structure

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Journal of iron and steel Research International 2019年第6期26卷 631-636页

作者： Guo-chao Li Xu Cheng Hua-ming Wang National Engineering Laboratory of Additive Manufacturing for Large Metallic components and Engineering Research Center of Ministry of Education on Laser Direct Manufacturing for Large Metallic components School of Materials Science and Engineering Beihang University Beijing 100191 China Beijing Yuding Additive Manufacturing Research Institute co. Ltd. Beijing 102206 China

After annealed at 1000 ℃, a special basket-weave structure is obtained in laser additive manufactured Ti-6Al-2V-1.5Mo- 0.5Zr-0.3Si alloy. The unit of the special basket-weave structure is a lamellas clusters, which consist of lamellar primary ot (otp), crab-like structures at the edges of otp and lamellar secondary a (as) on both sides of otp. As the units of basket-weave structures, the width of the clusters is much larger than that of a lamellas in as-deposited alloy. The formation temperature and process of the special basket-weave structure are studied, and the room temperature properties are tested and compared with the as-deposited alloy. The results show that the formation of the special basket-weave structure finishes within about 30 s and crab-like structures form earlier than lamellar as. The yield strength of the alloy is decreased by about 75 MPa compared to that of the as-deposited alloy. Besides, the proof-ultimate strength difference of the alloy is two times higher than that of the as-deposited alloy with about 34% improvement for the impact toughness. It is because ot colony size shows a positive correlation to the width of the unit forming basket-weave structure. The enhancement in proof-ultimate strengthdifference could significantly improve the toughness of the alloy, and thus effectively increase the safety of the alloy.

关键词： Titanium alloy Basket-weave structure Formation process a colony size Yield strength

Surface Nanocrystallization of Nb-Ti Stabilized 439M Ferritic Stainless steel

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Journal of iron and steel Research International 2014年第9期21卷 891-896页

作者： Yao-chun ZHANG Chao CHEN Cheng-jia SHANG Dong-yang LI Nuclear Equipment Division CNNC China Nuclear Power Engineering Co.Ltd. School of Materials Science and Engineering University of Science and Technology Beijing Department of Chemical and Materials Engineering University of AlbertaEdmonton T6G2V4AlbertaCanada

A new nanocrystallization process was designed, which included punching the surface coating to generate dislocation network or cells and recovery treatment to turn the dislocation cells into nano-sized grains. The effort was made to increase the service life of Nb-Ti stabilized 439M stainless steel surface with medium passive ability, particularly to enhance the outmost surface layer by nanocrystallization for improving resistances to corrosion. Electrochemical properties, electron work functions （EWFs）, nano-mechanical properties of the nanocrystallized surfaces were investigated. It was demonstrated that the nanocrystallized 439M stainless steel surface exhibited improved resistance to corrosion in 0.5 mol/L H2 SO4 solution. However, the nanoci＇ystallized 439M stainless steel surface exhibited decreased resistance to corrosion in 3.5% NaCl solution.

关键词： nanocrystallization corrosion ferritic stainless steel punching recovery

Mass production of magnetocaloric LaFeMnSiB alloys with hydrogenation

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Journal of iron and steel Research International 2017年第4期24卷 462-468页

作者： Tao Zhang Cheng-yong Wang Lugee Li Yong Zhang Cui-lan Liu Guangdong University of Technology Guangzhou 510006GuangdongChina Dongguan Eontech co. Ltd.Dongguan 523662GuangdongChina State Key Laboratory of Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Baotou Research Institute of Rare Earth Baotou 014030Inner MongoliaChina

LaFe_（11.39）Mn_（0.35）Si_（1.26）B_（0.1）Hxalloys were prepared by *** were annealed at 1343Kfor30-90 hto form the NaZn13 ***-rich andα-Fe secondary phases were also *** hydrogenation at 553 Kand 0.15 MPa of H_2 pressure for 5hwas employed to improve the Curie temperature of the alloys to 279 *** maximum magnetic entropy change,relative cooling power,and adiabatic temperature change of LaFe_（11.39）Mn_（0.35）Si_（1.26）B_（0.1）H_x annealed at 1343 Kfor 90hafter hydrogen absorption are 6.38J/（kg·K）（magnetic changesμ0ΔH =1.65T）,100.1J/kg（μ0ΔH =1.65T）,and 2.2 K（μ0ΔH =1.48T）,*** the maximum magnetic entropy change of the LaFe_（11.39）Mn_（0.35）Si_（1.26）B_（0.1）H_x alloys is lower than those of similar alloys with high purity raw materials,the relative cooling power is nearly the *** effect of impurities of the raw materials used was also *** is assumed that the impurity of 0.2wt.% Al is responsible for the reduced entropy change of the resulted *** LaFe_（11.39）Mn_（0.35）Si_（1.26）B_（0.1）H_x alloys prepared by this method could be a low cost alternative material for room temperature magnetic cooling applications.

关键词： Magnetocaloric effect Annealing Hydrogenation Adiabatic temperature change Relative cooling power Maximum magnetic entropy change

Effects of slag composition and additive type on desulfurization of rejected electrolytic manganese metal scrap by Na2O-containing electroslag

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Journal of iron and steel Research International 2021年第12期28卷 1515-1529页

作者： Ru Lu Guang-qiang Li Chang Liu Yun-ming Gao Yu-fei Chen Qiang Wang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Rising Technology co. Ltd.Huangshi435000HubeiChina

The recycling rate of rejected electrolytic manganese metal(EMM)scrap can be increased by inhibiting the manganese metal(MM)vaporization during the remelting process with ***,if the latter is achieved by reducing the remelting temperature,the desulfurization behavior will ***,Na_(2)O-containing electroslag and metallic additive were used to increase the rejected EMM scrap recovery *** respective high-temperature experiment was conducted in a MoSi_(2) electrical resistance furnace filled with fluid argon at 1673 K using five different types of electroslag with the Na_(2)O content ranging from 5.81%to 15.71%.High-purity metallic magnesium and magnesium calcium alloy additives were used as *** addition of Na_(2)O and metallic additives effectively promoted the desulfurization and deoxidization of *** removal of sulfur and oxygen by the interaction between Na_(2)O-containing electroslag melt and molten MM with metallic additive was analyzed from the thermodynamic and kinetic *** effect of Na_(2)O-containing electroslag volatilization on desulfurization and deoxidization was *** an increase in Na_(2)O content in the slag,the mass loss rates of Na_(2)O and electroslag rose,as well as the final sulfur partition *** the Na_(2)O content volatilized in the slag melt did not exceed 10.44%,the sulfur removal ratio was increased by high sulfide capacity and CaO activity in all slags due to the addition of Na_(2)*** rejected EMM scrap deoxidization ratio grew with the increased activity of CaO and reduced activity of Al_(2)O_(3) in the molten slag,caused by the increased Na_(2)O content in the molten *** addition of metallic Mg and Mg-Ca alloy indirectly promoted desulfurization and deoxidization by reducing the MnO content in the rejected EMM scrap and growing slag *** Mg-Ca alloy could also react with dissolved sulfur and oxygen,directly promoting desulfurization and deoxidiza

关键词： Rejected electrolytic manganese metal Desulfurization Deoxidization Additive Na2O content Thermodynamic

Vaporization reduction characteristics of aqueous ammonia solutions by the addition of ethylene glycol, glycerol and glycine to the co_2 absorption process

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Journal of Environmental Sciences 2012年第3期24卷 494-498页

作者： Jong-Beom Seo Soo-Bin Jeon Je-Young Kim Gang-Woo Lee Jong-Hyeon Jung Kwang-Joong Oh Department of Environmental Engineering Pusan National University Busan 609735 Korea. Research Institute of Industrial Science & Technology Pohang 790330 Korea Research & Development Institute of Yoosung co. ltd. Ulsan 680070 Korea Faculty of Health Science Daegu Haany University Daegu 712715 Korea

Aqueous ammonia （NH3） solution can be used as an alternative absorption for the control of co2 emitted from flue gases due to its high absorption capacity, fast absorption rate and low corrosion problem. The emission of co2 from iron and steel plants requires much attention, as they are higher than those emitted from power plants at a single point source. In the present work, low concentration ammonia liquor, 9 wt.%, was used with various additives to obtain the kinetic properties using the blast furnace gas model. Although a solution with a high ammonia concentration enables high co2 absorption efficiency, ammonium ions are lost as ammonia vapor, resulting in reduced co2 absorption due to the lower concentration of the ammonia absorbent. To decrease the vaporization of ammonia, ethylene glycol, glycerol and glycine, which contain more than one hydroxyl radical, were chosen. The experiments were conducted at 313 K similar to the co2 absorption conditions for the blast furnace gas model.

关键词： ammonia vaporization blast furnace gas ethylene glycol glycerol glycine