Metallurgical Research & Technology最新文献_第9页

Optimizing MgO distribution between sinter and pellet based on melting behavior and interaction 基于熔融行为和相互作用的烧结矿和球团间MgO分布优化

IF 1.1 4区材料科学

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI: 10.1051/METAL/2021042

Kaikai Bai, Yu-zhu Pan, Jing-song Wang, H. Zuo, Q. Xue

引用次数: 1

The steel plate curvature analytic modeling for the snake rolling with the same roll diameters 相同辊径下蛇形轧制钢板曲率解析建模

IF 1.1 4区材料科学

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI: 10.1051/METAL/2021001

Lian-yun Jiang, Jin-bo Huang, Tao Zhen, Wei Yaoyu, Zhen-Lei Li

{"title":"The steel plate curvature analytic modeling for the snake rolling with the same roll diameters","authors":"Lian-yun Jiang, Jin-bo Huang, Tao Zhen, Wei Yaoyu, Zhen-Lei Li","doi":"10.1051/METAL/2021001","DOIUrl":"https://doi.org/10.1051/METAL/2021001","url":null,"abstract":"The snake rolling can keep the plate shape well, and the larger shear strain produced by the snake rolling is conducive to the deformation penetrating into the center of the heavy plate. So it provides a new method for producing the high-performance heavy steel plate. However, there is little research on the plate curvature modeling which is the key to achieve the snake rolling process. The deformation region was divided into four different zones at most which was depended on the positions of the two neutral points, and this number could be dropped to three or two in some other conditions. It was divided into three different cases according to the neutral point position: I, II, III and IV; I, II and IV; II and IV. The unit pressure and the accumulated shear strain deviation between the top and bottom portions of the plate with every case were established, and the plate curvature caused by shear strain was calculated on this basis. The plate curvature caused by the axial strain was also calculated according to the flow criterion. The approximations are corrected by a fitting coefficient E . The homogeneity coefficient E was introduced during the plate curvature modeling process to make the model more accurate. Then the total plate curvature model was established. The simulation of snake rolling process is carried out by using ANSYS LS-DYNA, and the plate curvature results are compared with the theoretical method. The results showed that the maximum and minimum relative error of the model was 11.61% and 0.28% compared to the simulation method, which can be applied for the online plate curvature control application with the effect of some self-learning methods. The plate curvature affecting law with the different process parameters (roll offset, roll speed ratio, rolling reduction, plate thickness and so on) was obtained in this paper. The research about the plate curvature modeling will provide important references for the heavy steel plate snake rolling production.","PeriodicalId":18527,"journal":{"name":"Metallurgical Research & Technology","volume":"1 1","pages":"205"},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79757416","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: 1

Structural and mechanical properties of W-C: H coatings prepared by HiTUS HiTUS法制备W-C: H涂层的结构和力学性能

IF 1.1 4区材料科学

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI: 10.1051/METAL/2021012

L. Kvetková, Petra Hviščová, Z. Molčanová, M. Kabátová, F. Lofaj, V. Girman

{"title":"Structural and mechanical properties of W-C: H coatings prepared by HiTUS","authors":"L. Kvetková, Petra Hviščová, Z. Molčanová, M. Kabátová, F. Lofaj, V. Girman","doi":"10.1051/METAL/2021012","DOIUrl":"https://doi.org/10.1051/METAL/2021012","url":null,"abstract":"The structure and mechanical properties of hydrogenated tungsten-carbon (W-C: H) coatings have been studied as a function of the composition and structure. These coatings were prepared by the High Target Utilization Sputtering (HiTUS), the first time used for this type of coatings. W-C: H coatings were deposited from tungsten–carbide target in argon, argon–acetylene (C2H2), and argon–methane (CH4) atmosphere on bearing steel 100Cr6 substrate, Al substrate, Si wafer a, and WC-Co substrate. W-C: H coatings obtained at different acetylene and methane flow were characterized by Elastic Recoil Detection Analysis (ERDA) and Rutherford Backscattering (RBS), X-ray diffraction, Transmission electron microscopy (TEM), and nanoindentation. Mechanical properties of these coatings are controlled within a range through a change in mutual concentration of crystalline phase and amorphous hydrogenated carbon matrix. The higher hardness (Hit = 29.5 ± 4.5 GPa) was measured for coating with 3 sccm methane addition. W-C: H coatings with more than 4 sccm of C2H2 and CH4 addition had fully amorphous structure and worse off mechanical properties.","PeriodicalId":18527,"journal":{"name":"Metallurgical Research & Technology","volume":"1 1","pages":"210"},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89459238","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 mercury removal mechanism of selenium mercury material by soda roasting 钠焙烧法对含硒汞材料除汞机理的研究

IF 1.1 4区材料科学

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI: 10.1051/metal/2021070

Shanhong Zhu, Na Yang, Lin Zhang

{"title":"The mercury removal mechanism of selenium mercury material by soda roasting","authors":"Shanhong Zhu, Na Yang, Lin Zhang","doi":"10.1051/metal/2021070","DOIUrl":"https://doi.org/10.1051/metal/2021070","url":null,"abstract":"In the present work, Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) were employed in the investigation of roasting mechanism, roasting dynamic model, control step of soda roasting process of selenium–mercury material. The results indicated that at the beginning of the roasting process, the control step might be interface chemical reaction for the first 30 min, and the kinetic equation might be 1−(1−R)⅓ = Kt with a activation energy E1 = 40.50 kT/mol. However, as the roasting proceeded, internal diffusion gradually became the control step for 90–135 min, and the kinetic equation might be 1−⅔R−(1−R)⅔ = Dt with a activation energy E2 = 6.75 kT/mol. The SEM analysis of the roasted selenium–mercury materials indicated that the dynamic model of soda roasting attributed to the shrinkage model was reasonable. Combined with the results obtained by SEM and EDS of the roasted selenium–mercury materials, we concluded that the addition of too much Na2CO3 might lead to the formation of molten crystalline phase in the inner of the roasted selenium–mercury materials, changing the mercury removal mechanism of the roasting process. Meanwhile, Se had a tendency to segregate at where the content of Na was relatively high. In order to study the mechanism of diffusion, Na2O2 of 9% was added to one of the samples. According to the results, we concluded that the diffusion of products (such as HgxOy) from the inside of the raw material was the control step of internal diffusion.","PeriodicalId":18527,"journal":{"name":"Metallurgical Research & Technology","volume":"84 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73920812","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 CaF2 on the aggregation and growth of ferronickel particles in the self-reduction of Nickel laterite ore CaF2对红土镍矿自还原过程中镍铁颗粒聚集生长的影响

IF 1.1 4区材料科学

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI: 10.1051/metal/2021050

G. Hang, Z. Xue, Yingjiang Wu, Bo Zhang

{"title":"Effect of CaF2 on the aggregation and growth of ferronickel particles in the self-reduction of Nickel laterite ore","authors":"G. Hang, Z. Xue, Yingjiang Wu, Bo Zhang","doi":"10.1051/metal/2021050","DOIUrl":"https://doi.org/10.1051/metal/2021050","url":null,"abstract":"Increasing attention is being paid to the self-reduction and magnetic separation of nickel laterite ore because of economic and efficiency advantages. The aggregation and growth of ferronickel particles during the reduction process is an important factor for subsequent magnetic separation. In this study, the effect of CaF2 on ferronickel particle aggregation and growth during the self-reduction of nickel laterite ore was investigated by visual data analysis of ferronickel particles. The recovery and grade of Ni and Fe from the self-reduction, fine grinding, and magnetic separation of nickel laterite ore under the strengthening action of CaF2 were measured. Increasing CaF2 addition yielded a significant increase in the average particle size of ferronickel particles and an increased recovery of a higher grade of Ni. A ferronickel concentrate with 7.1 wt% Ni and 68.5 wt% Fe was obtained at a Ni recovery of 84.14% in the presence of 8 wt% CaF2. CaF2 accelerates the aggregation and growth of ferronickel particles, which promotes the separation of the ferronickel alloy from the gangue in the magnetic separation process.","PeriodicalId":18527,"journal":{"name":"Metallurgical Research & Technology","volume":"8 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90098882","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: 3

Evolution of inclusions in Mg-RE-Ti treated steels with different Al contents and their influence on acicular ferrite 不同Al含量Mg-RE-Ti处理钢中夹杂物的演变及其对针状铁素体的影响

IF 1.1 4区材料科学

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI: 10.1051/METAL/2021018

Xia Cui, B. Song, J. Mao

引用次数: 3

Gauge-Looper integrated optimal control for hot strip finishing mills based on sliding mode control 基于滑模控制的热轧带钢厚套综合优化控制

IF 1.1 4区材料科学

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI: 10.1051/metal/2021056

Yin Fang-chen, Shi Hong-wei

{"title":"Gauge-Looper integrated optimal control for hot strip finishing mills based on sliding mode control","authors":"Yin Fang-chen, Shi Hong-wei","doi":"10.1051/metal/2021056","DOIUrl":"https://doi.org/10.1051/metal/2021056","url":null,"abstract":"Gauge-Looper and tension are controlled independently in the conventional control strategies, which are not able to deal with the external disturbance. Many researchers have proposed and applied a variety of control schemes for this problem, but the increasingly strict market demand for strip quality requires further improvements. This work describes a sliding mode control (SMC) strategy that realizes the optimal control of a automatic Gauge control and Looper control integrated system. Firstly, a state-space model of Gauge-Looper integrated system was established based on a 1700 mm tandem hot mill. Then, In order to achieve the desired dynamical performance of Gauge-Looper integrated system, the sliding mode surface and control law of SMC controller was designed. Simulation experiments for a traditional PID controller and the proposed SMC controller were conducted using MATLAB/Simulink software. The simulation results show that when the system is disturbed, the traditional controller produces a Gauge fluctuation of 0.136 mm and tension fluctuation of 1.177 MPa, which is unacceptable in hot strip mills. The SMC controller restricts the Gauge fluctuation to less than 0.047 mm, and the tension fluctuation is less than 0.382 MPa in all cases.","PeriodicalId":18527,"journal":{"name":"Metallurgical Research & Technology","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76342768","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: 1

Study on the utilization of supersaturation degree in Al deoxidation to improve cleanliness and control of Al2O3 inclusions in ultra-low carbon steel 利用过饱和度在Al脱氧中提高超低碳钢的清洁度和控制Al2O3夹杂物的研究

IF 1.1 4区材料科学

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI: 10.1051/METAL/2021007

Yun-qing Ji, M. Jiang, Xiaoxuan Deng, Chunyang Liu, F. Huang, Xinhua Wang

{"title":"Study on the utilization of supersaturation degree in Al deoxidation to improve cleanliness and control of Al2O3 inclusions in ultra-low carbon steel","authors":"Yun-qing Ji, M. Jiang, Xiaoxuan Deng, Chunyang Liu, F. Huang, Xinhua Wang","doi":"10.1051/METAL/2021007","DOIUrl":"https://doi.org/10.1051/METAL/2021007","url":null,"abstract":"Effects of supersaturation degree (S) in Al deoxidation on cleanliness and alumina inclusions in steel were studied. If enough Al was added to steel, higher initial dissolve oxygen before Al deoxidation resulted in higher steel cleanliness. In the experiments, with the rise of [mass% O] from 102 ppm to 340 ppm and 931 ppm, logS in steel melts were increased from 4.8, to 7.0 and 8.8, respectively. As a result, total oxygen (T.O) was decreased to 25 ppm, 22 ppm and 21 ppm, respectively. Based on the results, important influence of supersaturation degree on the formation of Al2O3 was revealed. At lower S, Al2O3 would be singular and smaller particles ≤ 5 µm that was difficult to be removed. However, Al2O3 would exist as large clusters in steel at higher S, which can be efficiently removed. By utilizing the findings in laboratory, RH refining of ultra-low-carbon steel was optimized. Steel cleanness and control of inclusions were improved. As a result, surface defects in cold rolling sheets caused by Al2O3 inclusions were effectively minimized.","PeriodicalId":18527,"journal":{"name":"Metallurgical Research & Technology","volume":"85 1","pages":"308"},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76562524","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: 1

The influence of carbonitriding conditions on microstructure and mechanical properties of 25CrMo4 low-alloy steel 碳氮共渗条件对25CrMo4低合金钢组织和力学性能的影响

IF 1.1 4区材料科学

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI: 10.1051/METAL/2020089

Abdelkarim Ghanem, M. Terres

{"title":"The influence of carbonitriding conditions on microstructure and mechanical properties of 25CrMo4 low-alloy steel","authors":"Abdelkarim Ghanem, M. Terres","doi":"10.1051/METAL/2020089","DOIUrl":"https://doi.org/10.1051/METAL/2020089","url":null,"abstract":"Carbonitriding is an important industrial process applied for the improvement of the mechanical characteristics of the component of many steels employed in several machines parts like cam shafts, crank shafts and gears to enhance fatigue strength and wear resistance. In this study, the influence of the gaseous carbonitriding on the enhancement of surface characteristics and mechanical properties was investigated using different parameters for low alloy steel. The analysis and characterization of the treated material were carried out employing optical microscopy (OM) and scanning electron microscopy (SEM) and X-ray diffraction methods (retained austenite and residual stresses). Microhardness and tensile tests were performed and the fracture mechanisms of the various materials were ultimately examined and discussed. The main contribution of this research work is to show and optimize the selection of the appropriate parameters for this kind of steel in industrial field. Diffusion mechanism and microstructure proved that the process of high temperature gas carbonitriding allowed enhancing the mechanical properties of material. This process resulted in a rise of the yield strengths and a loss in a pronounced ductility associated with the brittle intergranular fracture surface caused by the nitride precipitation in the grain boundaries.","PeriodicalId":18527,"journal":{"name":"Metallurgical Research & Technology","volume":"25 1","pages":"115"},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75059473","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: 3

The critical influence of La content on the microstructure-toughness relationship in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels La含量对高强度低合金钢模拟粗晶热影响区组织-韧性关系的关键影响

IF 1.1 4区材料科学

Metallurgical Research & Technology Pub Date : 2021-01-01 DOI: 10.1051/METAL/2021009

Yuxin Cao, Wan Xiangliang, F. Zhou, Han. Dong, K. Wu, Guangqiang Li

{"title":"The critical influence of La content on the microstructure-toughness relationship in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels","authors":"Yuxin Cao, Wan Xiangliang, F. Zhou, Han. Dong, K. Wu, Guangqiang Li","doi":"10.1051/METAL/2021009","DOIUrl":"https://doi.org/10.1051/METAL/2021009","url":null,"abstract":"The present study was envisaged to investigate the role of La content on the particle, microstructure and toughness in the simulated coarse-grained heat-affected zone (CGHAZ) of high-strength low-alloy steels. Three steels with La content of 0.016 wt.%, 0.046 wt.% and 0.093 wt.% were prepared and simulated in a 100 kJ/cm heat input welding thermal cycle. Subsequently, the particle and microstructure of selected specimens were characterized and the impact absorb energy was measured at −20 °C. The results indicated that the La2 O2 S inclusions in 0.016 wt.%-La steel were gradually modified to LaS-LaP in 0.046 wt.%-La steel and to LaP in 0.093 wt.%-La steel. A higher fraction of acicular ferrite was obtained in the simulated CGHAZ of 0.016 wt.%-La steel, since the inclusion of La2 O2 S was more powerful to induce the formation of acicular ferrite. Furthermore, the fraction of M-A constituents in the simulated CGHAZ increased with increasing La content. The impact toughness in the simulated CGHAZ of 0.016 wt.%-La steel was the highest, owing to the high fraction of the fine-grained acicular ferrite and low fraction of M-A constituent.","PeriodicalId":18527,"journal":{"name":"Metallurgical Research & Technology","volume":"4 5 1","pages":"212"},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86352467","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: 2