Journal of Mining and Metallurgy Section B-Metallurgy最新文献_第2页

Effect of water vapor on the reduction kinetics of hematite powder by hydrogen-water vapor in different stages 水蒸气对不同阶段赤铁矿粉氢-水蒸气还原动力学的影响

IF 1 4区材料科学

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2023-01-01 DOI: 10.2298/jmmb220523006m

X. Mao, X. Hu, Yuewen Fan, K. Chou

{"title":"Effect of water vapor on the reduction kinetics of hematite powder by hydrogen-water vapor in different stages","authors":"X. Mao, X. Hu, Yuewen Fan, K. Chou","doi":"10.2298/jmmb220523006m","DOIUrl":"https://doi.org/10.2298/jmmb220523006m","url":null,"abstract":"The powder of hematite sample was isothermally reduced with hydrogen-water vapor gas mixture at 1023K-1273K. The results indicated that the overall reduction process of hematite could be separated into three stages (Fe2O3-Fe3O4-FeO-Fe) to respectively study. At 1023K, the average reaction rate dropped by 53.6% in the stage 1 when the water vapor content of gas reactant rose from 0% to 50%, and it decreased by about 77.2% in the stage 2. However, in the stage 3, when the water vapor content only increased from 0% to 20%, it decreased by about 78.1%. Besides, the average reaction rate had a roughly negative linear relationship with the water vapor content, and the results further shown that the effect of water vapor on the reduction reaction increased with increasing reaction temperature at all stages of the reduction reaction. The microstructure of reduction products showed that it still had some holes, which the channel for hydrogen diffusion was not seriously blocked. In order to further clarify the influence of water vapor in the reduction stage, different models were considered, and the range of apparent activation energy of different stages obtained by model fitting was about 20-70 kJ/mol, which also confirmed the absence of solid-state diffusion phenomenon.","PeriodicalId":51090,"journal":{"name":"Journal of Mining and Metallurgy Section B-Metallurgy","volume":"25 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83605623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kinetic mechanism of FeCr2O4 reduction in carbon-containing iron melt 含碳铁熔体中FeCr2O4还原的动力学机理

IF 1 4区材料科学

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2023-01-01 DOI: 10.2298/jmmb230215010x

Yun-yang Xiao, L.-J. Wang, S.-Y. Liu, Xiao-bo He, K. Chou

引用次数: 0

Corrosion properties of aluminized 16Mo3 steel 渗铝16Mo3钢的腐蚀性能

IF 1 4区材料科学

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2023-01-01 DOI: 10.2298/jmmb220927008k

B. Karpe, K. Prijatelj, M. Bizjak, T. Kosec

引用次数: 0

The melting performance of high alumina blast furnace slags 高铝高炉炉渣的熔融性能

IF 1 4区材料科学

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2023-01-01 DOI: 10.2298/jmmb220722009z

Hai-yan Zheng, Y. Zhang, Z. Wang, Jingbo Du, X. Jiang, Qiang-jian Gao, Feng-man Shen

引用次数: 0

Effect of extrusion process on the stress corrosion cracking resistance of 7N01 aluminum alloy 挤压工艺对7N01铝合金抗应力腐蚀开裂性能的影响

IF 1 4区材料科学

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2023-01-01 DOI: 10.2298/jmmb221229012x

Huiyuan Xie, Z. Yang, Q. Ma, W. Meng, L. Hu, X. Yin

引用次数: 0

Study on the drying characteristics of green pellets of ultrafine iron ore concentrate 超细铁精矿绿球团干燥特性研究

IF 1 4区材料科学

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2023-01-01 DOI: 10.2298/jmmb220810018w

B. Wen, X.-P. Zhang, D.-L. Liu, J.-X. Li, X.-D. Sun, J.-L. Yang

{"title":"Study on the drying characteristics of green pellets of ultrafine iron ore concentrate","authors":"B. Wen, X.-P. Zhang, D.-L. Liu, J.-X. Li, X.-D. Sun, J.-L. Yang","doi":"10.2298/jmmb220810018w","DOIUrl":"https://doi.org/10.2298/jmmb220810018w","url":null,"abstract":"Ultrafine iron ore concentrate pose challenges like poor pellets formation performance, low-bursting temperature, and a complex drying thermal regime. To examine the drying characteristics of green pellets of ultrafine iron ore concentrate, we employed Weibull distribution function and Dincer model to fit and analyze the corresponding drying curve. The effects of drying temperature and air speed on the strength of dried pellets were also studied. Our findings reveal that the drying process of green pellets of ultrafine iron ore concentrate involves three stages: ascending speed, constant speed, and descending speed. As the drying temperature and air speed increase, the drying time decreases. The coefficient of determination R2 for the fitted Weibull distribution function model ranged from 0.995 to 0.998, while the R2 value for the Dincer model ranged from 0.990 to 0.996. Both fitted models align with experimental data and prove to be effective. According to the Bi values obtained through the Dincer model, raising the drying air speed in the initial stage and the drying air temperature in the subsequent stage of the drying system can efficiently remove moisture, reduce green pellets rupture risk, and maintain productivity. The moisture diffusion coefficient and convective mass transfer coefficient increase with rising temperature and air velocity, following the order of Deff > Dcal > D*eff as determined by the Weibull distribution function, Dincer model, and Fick's second law. Additionally, the activation energy value of ultrafine iron ore concentrate for drying derived from the Arrhenius formula is 4515.60 J/(mol?K). Notably, increasing drying temperature increases the strength of dried particles due to their more compact and dense internal structure. This study offers theoretical support for simulating the drying of green ultrafine iron ore concentrate pellets and provides guidelines for selecting diverse drying conditions and designing drying equipment.","PeriodicalId":51090,"journal":{"name":"Journal of Mining and Metallurgy Section B-Metallurgy","volume":"26 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77572344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The magnesium-palladium-silver system: Thermodynamic properties of the liquid phase 镁-钯-银体系:液相热力学性质

IF 1 4区材料科学

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2023-01-01 DOI: 10.2298/jmmb230222016d

A. Dębski, W. Gasior, W. Gierlotka, A. Baran, M. Polański

{"title":"The magnesium-palladium-silver system: Thermodynamic properties of the liquid phase","authors":"A. Dębski, W. Gasior, W. Gierlotka, A. Baran, M. Polański","doi":"10.2298/jmmb230222016d","DOIUrl":"https://doi.org/10.2298/jmmb230222016d","url":null,"abstract":"A drop calorimetry method was used to measure the partial and integral mixing enthalpies of Ag-Mg-Pd liquid solutions. The experiments were performed for six separate series of liquid alloys starting from the binary alloys with constant xAg/xMg ratios equal to 1/9, 1/3, 1/1, and 3/1 for (Ag0.10Mg0.90)1-xPdx and (Ag0.25Mg0.75)1-xPdx at 1116 K and (Ag0.50Mg0.50)1-xPdx and (Ag0.75Mg0.25)1-xPdx at 1279 K and xMg/xPd ratios of 9/1 and 8/1 for (Mg0.90Pd0.10)1-xAgx and (Mg0.80Pd0.20)1-xAgx at 1116 K. Then, using the thermodynamic properties of the binary systems in the form of the Redlich-Kister equations and the changes in mixing enthalpies provided by this study, the ternary interaction parameters were determined with the Muggianu model and our own software (TerGexHm). Based on the binary and ternary interaction parameters, the partial mixing enthalpies of Ag, Mg, and Pd were calculated for the same cross-sections where the measurements were conducted. These studies were the first step of an investigation of the Ag-Mg-Pd system before the calculation of the phase diagram for this ternary system.","PeriodicalId":51090,"journal":{"name":"Journal of Mining and Metallurgy Section B-Metallurgy","volume":"75 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85475544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of ECAP process on deformability, microstructure and conductivity of CuCoNi alloy ECAP工艺对CuCoNi合金变形性能、组织和导电性的影响

IF 1 4区材料科学

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2023-01-01 DOI: 10.2298/jmmb220309004g

B. Grzegorczyk, S. Rusz, P. Snopiński, O. Hilšer, A. Skowronek, A. Grajcar

{"title":"Effect of ECAP process on deformability, microstructure and conductivity of CuCoNi alloy","authors":"B. Grzegorczyk, S. Rusz, P. Snopiński, O. Hilšer, A. Skowronek, A. Grajcar","doi":"10.2298/jmmb220309004g","DOIUrl":"https://doi.org/10.2298/jmmb220309004g","url":null,"abstract":"The study concerns the influence of various variants of severe plastic deformation in the Equal Channel Angular Pressing (ECAP) process on the microstructure, microhardness and conductivity of the CuCoNi alloy. The evolution of the microstructure was investigated by microscopic observations and electron back-scattered diffraction (EBSD) in a scanning electron microscope (SEM). Using the Vickers method, tests of microhardness of samples were performed after various variants of the ECAP process. The conductivity was measured with an eddy current device for measuring electrical conductivity based on the complex impedance of the measuring probe. The results indicated the possibility of deformation of CuCoNi alloys in the process of pressing through the ECAP angular channel and developing their microstructure and properties. The method is an effective tool for strengthening the tested copper alloy by refinement of the microstructure. After the first pass, the grain size was reduced by 80%. Increasing the plastic deformation temperature did not significantly affect the obtained level of microstructure fragmentation - the average grain size is approx. 1.4-1.5 ?m. The fragmentation of the microstructure had a negligible effect on the conductivity of the CuCoNi alloy, which after the ECAP process oscillated at the value of 13 MS/m.","PeriodicalId":51090,"journal":{"name":"Journal of Mining and Metallurgy Section B-Metallurgy","volume":"3 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90732838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on wear behaviour characteristics of ZrO2 and ZrN coated AZ91D Mg alloy ZrO2和ZrN涂层AZ91D镁合金磨损性能研究

IF 1 4区材料科学

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2023-01-01 DOI: 10.2298/jmmb230323024a

H. Allasi, P. Kumaradhas, M. Sivapragash, S. Vettivel

引用次数: 0

Effect of thermal ageing on tensile-plastic flow and work hardening parameters of Indian reduced activated Ferritic Martensitic steel 热时效对印度还原活化铁素体马氏体钢拉伸塑性流动和加工硬化参数的影响

IF 1 4区材料科学

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2023-01-01 DOI: 10.2298/jmmb221114019s

K. C. Sahoo, K. Laha

{"title":"Effect of thermal ageing on tensile-plastic flow and work hardening parameters of Indian reduced activated Ferritic Martensitic steel","authors":"K. C. Sahoo, K. Laha","doi":"10.2298/jmmb221114019s","DOIUrl":"https://doi.org/10.2298/jmmb221114019s","url":null,"abstract":"Effect of thermal ageing (873 K/5000 h) on microstructure, tensile-plastic flow and work hardening parameters of normalized and tempered (N&T) 1.4W-0.06Ta Indian Reduced Activated Ferritic Martensitic (INRAFM) steel was investigated. Hollomon, Ludwigson and Voce equations were used to explain the tensile-plastic flow response of the INRAFM steel over a wide temperature range of 300-873 K. Variations of strain hardening exponent was found to increase on ageing due to increase in work hardening capability of aged steel while strain hardening coefficient decreased on ageing. TEM specimens extracted near the tensile tested specimen of different temperatures were used to correlate the formation and movement of dislocation debris structure of both N&T and thermal aged specimens. Tensile plastic flow behavior at different temperatures was appropriately represented by Hollomon. Ludwigson and Voce equations and best fitting was adjudged by the goodness of fit (i.e. lowest ?2 values). Both yield strength (YS) and ultimate tensile strength (UTS) were fitted by the initial stress and saturation stress respectively as per the Voce constitutive equation and variations of initial stress and saturation stress with temperature were observed for N&T and aged steel. The absolute value of Voce strain component (nv) decreases due to ageing exhibiting two-stage behaviour with increase in temperature. The acceleration of recovery process was found lower at high temperature in case of steel subjected to thermal ageing as compared to N&T steel. Voce relation has been successfully used to predict the yield stress (YS) and ultimate tensile strength (UTS) of both thermal aged and N&T IN-RAFM steel at different temperatures.","PeriodicalId":51090,"journal":{"name":"Journal of Mining and Metallurgy Section B-Metallurgy","volume":"51 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78295860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0