Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material最新文献_第5页

Influence of isothermal bainitic processing on the mechanical properties and microstructure characterization of TRIP steel 等温贝氏体加工对TRIP钢力学性能和显微组织表征的影响

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI: 10.1016/S1005-8850(08)60107-3

Haitao Jiang, Hubin Wu, Di Tang, Qiang Liu

{"title":"Influence of isothermal bainitic processing on the mechanical properties and microstructure characterization of TRIP steel","authors":"Haitao Jiang, Hubin Wu, Di Tang, Qiang Liu","doi":"10.1016/S1005-8850(08)60107-3","DOIUrl":"10.1016/S1005-8850(08)60107-3","url":null,"abstract":"<div>The mechanical properties of transformation induced plasticity (TRIP) steel are strongly affected by the conditions of isothermal bainitic processing. The multiphase microstructure of TRIP steel under different conditions of isothermal bainitic processing was investigated using OM, SEM, XRD and TEM. The volume fraction of retained austenite and the carbon content in austenite were determined quantitatively using X-ray diffraction patterns. The relationship between mechanical properties and isothermal bainitic processing parameters was investigated. The stability of retained austenite was analyzed by the volume fraction of retained austenite and the carbon content in retained austenite. The experimental results show that the multiphase microstructure consists of ferrite, bainite and metastable retained austenite. To obtain good mechanical properties, the optimal conditions of isothermal bainitic temperature and holding time are 410-430°C and 180-240 s, respectively. After isothermal bainitic processing under the optimal conditions, the corresponding volume fraction of retained austenite is 5vol%-15vol%, which can provide enough retained austenite and plastic stability for austenite with high carbon content.</div>","PeriodicalId":100851,"journal":{"name":"Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material","volume":"15 5","pages":"Pages 574-579"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8850(08)60107-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79837954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Oxidation behavior of niobized TiAl by plasma surface alloying 等离子体表面合金化铌化TiAl的氧化行为

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI: 10.1016/S1005-8850(08)60110-3

Dongdong Chen , Wenhuai Tian , Jian Wang , Xiaoping Liu

引用次数: 1

Microsegregation and Rayleigh number variation during the solidification of superalloy Inconel 718 高温合金Inconel 718凝固过程中的微偏析和瑞利数变化

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI: 10.1016/S1005-8850(08)60111-5

Ling Wang , Jianxin Dong , Yuliang Tian , Lei Zhang

引用次数: 11

Surface modification of up-conversion luminescence material Na[Y0.57Yb0.39Er0.04]F4 with hydrosulfide group 氢硫化基团对上转换发光材料Na[Y0.57Yb0.39Er0.04]F4的表面改性

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI: 10.1016/S1005-8850(08)60113-9

Lili Cui , Huili Fan , Junping Xiao , Xiaowei Xu , Dong Su

引用次数: 3

Production of carbide-free thin ductile iron castings 生产无碳化物薄球墨铸铁件

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI: 10.1016/S1005-8850(08)60103-6

M. Ashraf Sheikh

引用次数: 10

Behavior of SiO2 in the leaching process of alumina clinker with high concentration 高浓度氧化铝熟料浸出过程中SiO2的行为

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI: 10.1016/S1005-8850(08)60101-2

Bin Chen, Xiaobin Li, Guihua Liu

{"title":"Behavior of SiO2 in the leaching process of alumina clinker with high concentration","authors":"Bin Chen, Xiaobin Li, Guihua Liu","doi":"10.1016/S1005-8850(08)60101-2","DOIUrl":"https://doi.org/10.1016/S1005-8850(08)60101-2","url":null,"abstract":"<div>It is essential for alumina production by alkaline process to know the behavior of minerals containing Al and Si in basic solution, and the behavior of SiO2 in the process of clinker leaching is an important portion. To study the behavior of SiO2 in the process of high concentration clinker leaching, experiments were carried out in home-made reactors. The results indicate that factors, such as temperature, time, Al2O3 concentration, as well as SiO2 concentration, have profound impact on the SiO2 and Al2O3 concentration of pregnant liquor during the high concentration leaching. However, sodium carbonate and free caustic soda concentrations have no remarkable effect on it, thus they are the secondary factors compared with Al2O3 concentration. The concentration of SiO2 in the pregnant liquor could be reduced to a lower level when the major effect parameters of this process are controlled properly.</div>","PeriodicalId":100851,"journal":{"name":"Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material","volume":"15 5","pages":"Pages 538-542"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8850(08)60101-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90001779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Preparation and magnetic properties of Co-P thin films Co-P薄膜的制备及其磁性能

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI: 10.1016/S1005-8850(08)60115-2

Haicheng Wang, Zhongmei Du, Lijin Wang, Guanghua Yu, Fengwu Zhu

{"title":"Preparation and magnetic properties of Co-P thin films","authors":"Haicheng Wang, Zhongmei Du, Lijin Wang, Guanghua Yu, Fengwu Zhu","doi":"10.1016/S1005-8850(08)60115-2","DOIUrl":"10.1016/S1005-8850(08)60115-2","url":null,"abstract":"<div>Magnetic Co-P thin films were prepared by electroless deposition. The experiment results show that the film thickness has a significant influence on the coercivity. While the film thickness varied from 300 nm to 5 μm, the coercivity dropped sharply from 45.36 to 22.28 kA/m. As the film thickness increased further, the coercivity varied slowly. When the thickness of the film was 300 nm, the deposited film could realize the coercivity as high as 45.36 kA/m, and the remanent magnetization as high as 800 kA/m. The Co-P films were deposited on the surface of magnetic drums of encoders, whose diameter was 40 mm, and then 512 magnetic poles were recorded, meaning that the magnetizing pitch was 0.245 mm. The testing results indicate that the output signals are perfect, the output waveforms are steady and the pulses account is integral. Compared with the γ-Fe2O3 coating, the Co-P thin film is suitable to be the magnetic recording media for the high resolution magnetic rotary encoder.</div>","PeriodicalId":100851,"journal":{"name":"Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material","volume":"15 5","pages":"Pages 618-621"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8850(08)60115-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81010722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Structural and mechanical properties of amorphous carbon films deposited by the dual plasma technique 双等离子体沉积非晶碳膜的结构和力学性能

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI: 10.1016/S1005-8850(08)60116-4

Yaohui Wang, Xu Zhang, Xianying Wu, Huixing Zhang, Xiaoji Zhang

引用次数: 0

Universal thermodynamic model of calculating the mass action concentrations of components in a ternary strong electrolyte aqueous solution and its application in the NaCl-KCl-H2O system 三元强电解质水溶液中组分质量作用浓度计算的通用热力学模型及其在NaCl-KCl-H2O体系中的应用

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI: 10.1016/S1005-8850(08)60102-4

Weijie Zhao , Hanjie Guo , Xuemin Yang , Zhigang Dan

{"title":"Universal thermodynamic model of calculating the mass action concentrations of components in a ternary strong electrolyte aqueous solution and its application in the NaCl-KCl-H2O system","authors":"Weijie Zhao , Hanjie Guo , Xuemin Yang , Zhigang Dan","doi":"10.1016/S1005-8850(08)60102-4","DOIUrl":"10.1016/S1005-8850(08)60102-4","url":null,"abstract":"<div>A universal thermodynamic model of calculating the mass action concentrations of components in a ternary strong electrolyte aqueous solution has been developed based on the ion and molecule coexistence theory, and verified in the NaCl-KCl-H2O ternary system at 298.15 K. To compare the difference of the thermodynamic model in binary and ternary strong electrolyte aqueous solutions, the mass action concentrations of components in the NaCl-H2O binary strong electrolyte aqueous solution were also computed at 298.15K. A transformation coefficient was required to compare the calculated mass action concentration and reported activity because they were obtained at different standard states and concentration units. The results show that the transformation coefficients between calculated mass action concentrations and reported activities of the same components change in a very narrow range. The calculated mass action concentrations of components in the NaCl-H2O and NaCl-KCl-H2O systems are in good agreement with the reported activities. This indicates that the developed thermodynamic model can reflect the structural characteristics of solutions, and the mass action concentration also strictly follows the mass action law.</div>","PeriodicalId":100851,"journal":{"name":"Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material","volume":"15 5","pages":"Pages 543-551"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8850(08)60102-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87521667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Application of Al-free deoxidizer in rail steel manufacture 无铝脱氧剂在轨道钢生产中的应用

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI: 10.1016/S1005-8850(08)60100-0

Wei Wu, Liu Liu

引用次数: 2