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Effects of heating temperature and atmosphere on element distribution and microstructure in high-Mn/Al austenitic low-density steel

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International Journal of Minerals,Metallurgy and Materials 2024年第12期31卷 2670-2680页

作者： Qi Zhang Guanghui Chen Yuemeng Zhu Zhengliang Xue Guang Xu State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Zhejiang Red Eagle Group Co. Ltd.Huzhou 313000China

The elemental distribution and microstructure near the surface of high-Mn/Al austenitic low-density steel were investigated after isothermal holding at temperatures of 900-1200℃ in different atmospheres,including air,N_(2),and N_(2)+CO_(2).No ferrite was formed near the surface of the experimental steel during isothermal holding at 900 and 1000℃ in air,while ferrite was formed near the steel sur-face at holding temperatures of 1100 and 1200℃.The ferrite fraction was larger at 1200℃ because more C and Mn diffused to the sur-face,exuded from the steel,and then reacted with N and O to form oxidation *** thickness of the compound scale increased owing to the higher diffusion rate at higher *** addition,after isothermal holding at 1100℃ in N_(2),the Al content near the surface slightly decreased,while the C and Mn contents did not ***,no ferrite was formed near the ***,the near-surface C and Al contents decreased after holding at 1100℃in the N_(2)+CO_(2)mixed atmosphere,resulting in the formation of a small amount of *** compound scale was thickest in N_(2),followed by the N_(2)+CO_(2)mixed atmosphere,and thinnest in ***,the element loss and ferrite fraction were largest after holding in air at the same *** differences in element loss and ferrite frac-tion between in N_(2) and N_(2)+CO_(2)atmospheres were small,but the compound scale formed in N_(2) was significantly *** to these results,N_(2)+CO_(2)is the ideal heating atmosphere for the industrial production of high-Mn/Al austenitic low-density steel.

关键词： low-density steel oxidation microstructure element distribution compound scale

Effect of chemical composition on the element distribution,phase composition and calcification roasting process of vanadium slag

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2144-2151页

作者： Tangxia Yu Tao Jiang Jing Wen Hongyan Sun Ming Li Yi Peng State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000China School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education Northeastern UniversityShenyang 110819China Liaoning Key Laboratory for Metallurgical Sensor and Technology Shenyang 110819China

The chemical composition of vanadium slag significantly affects its element distribution and phase composition,which affect the subsequent calcification roasting process and vanadium *** this work,seven kinds of vanadium slags derived from different regions in China were used as the raw materials to study the effects of different components on the vanadium slag’s elements distribution,phase composition,calcification roasting,and leaching rate of major elements using scanning electron microscope,X-ray diffraction analysis,and inductively coupled plasma-optical emission *** results show that the spinel phase is wrapped with silicate phase in all vanadium slag *** main elements in the spinel phase are Cr,V,and Ti from the interior to the *** size of spinel phase in low chromium vanadium slag is larger than the other vanadium slags with higher chromium *** spinel phase of high-calcium and high-phosphorus vanadium slag is more *** strongest diffraction peak of vanadium spinel phase in the vanadium slag migrates to a higher diffraction angle,and(Fe_(0.6)Cr_(0.4))_(2)O_(3)is formed after calcification roasting as the chromium content increased.A large amount of Ca_(2)SiO_(4)is produced because excess Ca reacts with Si in high-calcium and high-phosphorus vanadium *** vanadium leaching rate reaches 88%in some vanadium *** chromium leaching rate is less than 5%in all vanadium *** silicon leaching rate of high-calcium and high-phosphorus vanadium slag is much higher than that of the other *** leaching rate of manganese is higher than 10%,and the leaching rates of iron and titanium are negligible.

关键词： vanadium slag calcification roasting element distribution phase composition leaching rate

element distribution of high iron-bearing zinc calcine in high gradient magnetic field

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Transactions of Nonferrous Metals Society of China 2012年第9期22卷 2261-2267页

作者：李密彭兵柴立元王纪明彭宁闫缓中南大学冶金科学与工程学院长沙410083 国家金属污染防治工程技术研究中心长沙410083

High gradient magnetic separation was conducted in order to separate insoluble zinc ferrite from zinc calcine before acid leaching of hydrometallurgical process. Chemical composition and structural characterization of zinc calcine were studied via inductively coupled plasma （ICP）, X-ray diffraction （XRD）, Mossbauer spectra, scanning electron microscopy （SEM） and laser particle analysis （LPA）. The parameters of magnetic separation which affect the distribution of zinc ferrite and undesired elements, such as calcium, sulfur and lead in magnetic concentrate were investigated. The results of high gradient magnetic separation indicate that more than 85% of zinc ferrite is distributed into magnetic concentrate from the zinc calcine under the magnetic induction of 0.70 T. In addition, about 60% of calcium and 40% of sulfur distribute in non magnetic phases of tailings during magnetic separation process. Most of lead distributes uniformly along the zinc calcine in superfine particle size.

关键词： zinc calcine zinc ferrite magnetic separation element distribution

Carbide precipitation and element distribution in high Co-Ni secondary hardening steel

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Journal of Iron and Steel Research International 2018年第3期25卷 340-346页

作者： Chen-chongWang Chi Zhang Zhi-gang Yang Jie Su State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 Liaoning China Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua University Beijing 100084 China Institute for Structural Materials Central Iron and Steel Research Institute Beijing 100081 China

As the increasing need of the steels with both high strength and hydrogen embrittlement resistance ability, carbide precipitation and element distribution in high Co-Ni secondary hardening steel were concerned. Carbide precipitation and element distribution in M54 were observed using carbon replicas method. Both simulation and observation results showed that MC and M2C formed in the steel. MC was round particle, which would act as grain refiners. And MzC was needle-like phase, which would be remarkable strengthening phases. Nb and V were main metallic elements in MC phase. Mo and Cr were main metallic elements in MzC phase. W, Co, and Ni were probably mainly dissolved in the matrix. As the carbide precipitation in AerMetl00 was M2C, which had similar size and shape with M2C in M54, the tensile strength and yield strength of AerMetl00 and M54 were similar. Compared with traditional high Co-Ni secondary hardening steel, M54 had higher hydrogen embrittlement resistance ability, probably because of element W in the matrix.

关键词： Carbide precipitation element distribution Carbon replicas method Secondary hardening steel Thermodynamic simulation

Response of element distribution of Various Organs of Maize to Fertilizer Application

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Agricultural Sciences in China 2010年第3期9卷 401-407页

作者： HU Hao, BAI You-lu, YANG Li-ping, KONG Qing-bo, LU Yan-li, WANG Lei and WANG Zhi-yong Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Nutrient Cycling, Ministry of Agriculture, Beijing 100081, P.R.China [a] Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Nutrient Cycling Ministry of Agriculture Beijing 100081 P.R.China

The effect of fertilizer application on biomass dry weight and element distribution of various organs of maize was investigated from the aspect of microscopic view to disclose the internal mechanism of fertilizer effect on crop. Five fertilizer treatments： no fertilizer （CK）, nitrogen phosphorus fertilizer （NP）, nitrogen potassium fertilizer （NK）, phosphorus potassium （PK）, and nitrogen phosphorus potassium fertilizer （NPK） were designed. Field experiment on the response of biomass dry weight and N, P, K, Cu, Zn, Fe, and Mn element distribution of stem, leaf and seed of maize （Zea mays L.） to different fertilizer treatments application was carried out. The results showed that dry weight and element content of various organs of maize were different. N content of various organs followed this order leaf〉 seed 〉 stem; P content of various organs was seed 〉 leaf〉 stem; K content was stem 〉 leaf〉 seed; and Fe content was leaf〉 stem 〉 seed. Fertilizer application reduced the differences of N, P, K, and Fe contents of various organs, and changed the size order of the dry weight and the Cu and Zn contents of leaf, seed and stem. Except for individual treatment, the response direction of N, P and Fe elements to fertilizer application was similar to Cu and Zn. The response of element content of various organs of maize to different fertilizer combinations was also different. The response extent of N, P and K major elements to fertilizer application was larger than microelement of Cu, Zn, Fe, and Mn; the response extent of stem and leaf was larger than seed; the response to NPK fertilizer treatment was bigger than NP, NK and PK. In the whole, response differences of element distribution to various fertilizer treatments were not remarkable. Besides, element distribution of various organs of maize was also influenced by the mutual effect of fertilizer varieties. The response direction and extent of various element distributions to different fertilizer treatments had both similarit

关键词： element distribution fertilizer application maize

Influence of Anthracite-to-Ilmenite-Ratio on element distribution in Titanium Slag Smelting in Large DC Furnaces

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Fluid Dynamics & Materials Processing 2022年第4期18卷 883-896页

作者： Shihong Huang Ting Lei Yan Cui Zhifeng Nie Office of Science and Technology Kunming UniversityKunming650214China Kunming Metallurgy College Kunming650033China College of Chemistry and Chemical Engineering Kunming UniversityKunming650214China Key Laboratory of Yunnan Provincial Higher Education Institutions for Organic Optoelectronic Materials and Devices Kunming UniversityKunming650214China

The distribution of titanium,carbon and associated elements(calcium,magnesium,silicon and aluminum)in a smelting process is studied by means of a chemical equilibrium calculation method for multiphase and multicomponent systems,and verified through comparison with production *** particular,using the coexistence theory for titanium slag structures,the influence of the AIR(anthracite to ilmenite ratio)on the distribution of such elements is *** results show that the AIR can be adjusted to achieve a selective reduction of oxides in the melt.

关键词： Titanium slag smelting element distribution

An investigation of cellular distribution of manganese in hyperaccumlator plant Phytolacca acinosa Roxb. using SRXRF analysis

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Journal of Environmental Sciences 2006年第4期18卷 746-751页

作者： XU Xiang-hua SHI Ji-yan CHEN Ying-xu XUE Sheng-guo WU Bei HUANG Yu-ying Department of Environmental Engineering Zhejiang University Hangzhou 310029 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100039 China

Phytolacca acinosa Roxb. （P acinosa） is a recently discovered manganese hyperaccumulator plant from southern China. It is a good candidate for phytoremediation of manganese（Mn） polluted soil for its high biomass and fast growth. Knowledge of the tissue localization and identification of heavy metals can provide essential information on metal toxicity and bioaccumulation mechanisms. Synchrotron radiation X-ray fluorescence spectroscopy （SRXRF） microprobe was used in this study to investigate the cellular distributions of Mn and other elements in root, stem, leaf, petiole and midrib of P. acinosa. The highest Mn content was found in the vascular tissues of root, stem, petiole and midrib. Cortex in root played a key role in Mn absorption and Mn was limited in the vascular bundle during the process of transportation in stem. Moreover, Mn content in leaf epidermis was higher than that in mesophyll, which suggested that the sequestration of Mn in leaf epidermis might be one of the detoxification mechanisms of P. acinosa. The significance of other elemental （such as P, S, K, Ca, Fe, Zn and Cu） distribution patterns and the correlation with Mn were also discussed.

关键词： hyperaccumulator Phytolacca acinosa Roxb. manganese element distribution SRXRF

Effects of Electromagnetic Continuous Casting on Structures,element distributions and Mechanical Properties of Cu-Mg-Te-Y Alloys

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Journal of Iron and Steel Research International 2012年第S2期19卷 961-964页

作者： CHEN Liang HAN Jian-ning XUE Yan-yan ZHOU Bing-wen JIA Fei ZHANG Xing-guo School of Materials Science and Engineering Dalian University of Technology

New Cu-Mg-Te-Y alloys with high strength and high conductivity were prepared by electromagnetic continuous casting（EMCC）and direct chill casting（DC）.The structures,patterns of elements distributions and mechanical properties of the alloys were *** was found that the equiaxed crystal zone was enlarged and the element Mg and Cu;Te phase were well-distributed by medium-frequency electromagnetic field during continuous casting ***,the defects and casting impurities were significantly reduced with the addition of electromagnetic,leading to the improvement of the mechanical properties.

关键词： Cu-Mg-Te-Y alloys EMCC structures element distribution mechanical properties

distribution behavior of valuable elements in oxygen-enriched top-blown smelting process of waste printed circuit boards

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Transactions of Nonferrous Metals Society of China 2024年第11期34卷 3721-3736页

作者： Kang YAN Wen-can QUAN Zhong-tang ZHANG Hua-ping NIE Rui-xiang WANG Zhi-feng XU School of Metallurgy Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Key Laboratory of Ionic Rare Earth Resources and Environment Ministry of Natural ResourcesGanzhou 341000China Ganzhou Engineering Technology Research Center of Green Metallurgy and Process Intensification Ganzhou 341000China School of Material Engineering Jiangxi College of Applied TechnologyGanzhou 341000China

Oxygen-enriched top-blown smelting is a promising technology for processing waste printed circuit boards(WPCBs).The distribution behavior of valuable elements in WPCBs during smelting was investigated by varying the oxygen-enriched concentration,oxygen volume,CaO/SiO_(2)(mass ratio),and Fe/SiO_(2)(mass ratio).The optimal operating conditions were obtained by implementing a one-factor-at-a-time method.X-ray diffractometer,scanning electron microscopy−energy dispersive spectrometer,and inductive coupled plasma-atomic emission spectroscopy methods were utilized to detect the chemical composition,occurrence state as well as elemental contents of alloy and *** is found that the elements of Cu,Sn and Ni are mainly accumulated in the alloy while Fe is mainly oxidized into the *** direct yields of Cu,Sn and Ni are 90.18%,85.32%and 81.10%under the optimal conditions of temperature 1250℃,oxygen-enriched concentration 30%,oxygen volume 24 L,CaO/SiO_(2) mass ratio 0.55,and Fe/SiO_(2) mass ratio *** results show that the valuable metals are mainly lost in the slag through mechanical entrainment.

关键词： waste printed circuit boards top-blown smelting element distribution thermomechanical analysis slag type