Journal of University of Science and Technology Beijing最新文献

Forward slip theoretical model and simulation for variable gauge rolling of TRB sheet TRB薄板变径轧制正向滑移理论模型及仿真

Journal of University of Science and Technology Beijing Pub Date : 2014-01-01 DOI: 10.13374/J.ISSN1001-053X.2014.02.016

Wei Yu, Guang Sun

{"title":"Forward slip theoretical model and simulation for variable gauge rolling of TRB sheet","authors":"Wei Yu, Guang Sun","doi":"10.13374/J.ISSN1001-053X.2014.02.016","DOIUrl":"https://doi.org/10.13374/J.ISSN1001-053X.2014.02.016","url":null,"abstract":"Based on the characteristic of variable gauge rolling and the definition of forward slip,a forward slip theoretical model was proposed in this article. A finite element model was also established with MARC software. The rolling processes of four different variable gauge strips were numerically simulated at the rolling friction coefficient of 0. 08 and 0. 1. In addition,the total amount of forward slip was measured by an experimental rolling approach. After comparison and analysis,it is found that there is little difference between the value calculated by theoretical forward slip model and the one simulated by finite element method. The difference is less than 0. 005. Differing from stable forward slip in tradition constant thickness rolling,the forward slip fluctuates from 0. 02 to 0. 10 in the variable gauge rolling process. The increase of reduction rate in the variable gauge zone leads to a higher forward slip. A smaller slope of the variable gauge zone and the low friction coefficient result in a better rolling stability and a smaller fluctuation of forward slip. The experiment of TRB rolling also verifies the accuracy of the theoretical forward slip model for variable gauge rolling. The large tolerance between the measured value and the calculated one in thinning rolling is probably caused by the strain condition of deformation area and the increasing slip tendency.","PeriodicalId":17554,"journal":{"name":"Journal of University of Science and Technology Beijing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76994669","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: 2

Phosphorus removal of oolitic high-phosphorus iron ore using biomass char 生物质炭对鲕状高磷铁矿除磷的研究

Journal of University of Science and Technology Beijing Pub Date : 2014-01-01 DOI: 10.1002/9781119093381.ch46

Tang Hui-qin

{"title":"Phosphorus removal of oolitic high-phosphorus iron ore using biomass char","authors":"Tang Hui-qin","doi":"10.1002/9781119093381.ch46","DOIUrl":"https://doi.org/10.1002/9781119093381.ch46","url":null,"abstract":"A method of phosphorus removal was proposed to process oolitic high-phosphorus iron ore. It is an integration of direct reduction and melting separation with carbon-containing pellets prepared with high-reactivity biomass char. Direct reduction experiments were performed in a tubular furnace,and three parameters were investigated,i. e.,reduction temperature,biomass char adding ratio( carbon-to-oxygen molar ratio) and atmospheres. The optimum condition was determined to be the reduction temperature of 1373K,the biomass adding ratio of 0. 9,the PCO2/PCOvalue of 1∶ 1,and the reduction time of 15 to 25 min. Under this condition,the metallization rate and the residual carbon content of reduced samples are 75% to 80% and 0. 69% to 0. 11%,respectively. SEM-EDS and XRD examination of reduced samples obtained under the optimum condition shows that the major phases are metallic iron,calcium silicate and calcium phosphate,but phosphorus still remains in gangue. Subsequent melting separation experiments were conducted in a Si-Mo high-temperature furnace. Metal with the phosphorus content of some 0. 4% was obtained from the reduced samples; and furthermore,metal with the phosphorus content of less than 0. 3% could be obtained after introducing 2% to 4% Na2CO3into the melting system. Based on the above analysis,the feasibility of applying biomass char for phosphorus removal is demonstrated.","PeriodicalId":17554,"journal":{"name":"Journal of University of Science and Technology Beijing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78139343","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: 0

Shrinkage Kinetics during Sintering W-Ni-Fe Heavy Alloy with Ultrafine Grain 超细晶W-Ni-Fe重合金烧结收缩动力学

Journal of University of Science and Technology Beijing Pub Date : 2003-11-15 DOI: 10.2497/JJSPM.50.912

Wang Jun, Z. Liying, G. Zhimeng, Lin Tao, Wu Chengyi, Wu Qinghua

引用次数: 3

Thermodynamic Assessment of the Ni-Ga System Ni-Ga体系的热力学评价

Journal of University of Science and Technology Beijing Pub Date : 2002-01-01 DOI: 10.1361/10549710417696

Yuan Wenxia, Ust Beijing

引用次数: 0