Pub Date : 2014-01-01DOI: 10.13374/J.ISSN1001-053X.2014.02.016
Wei Yu, Guang Sun
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.
{"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":"201 1","pages":""},"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}
Pub Date : 2014-01-01DOI: 10.1002/9781119093381.ch46
Tang Hui-qin
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.
{"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":"45 1","pages":""},"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}
Wang Jun, Z. Liying, G. Zhimeng, Lin Tao, Wu Chengyi, Wu Qinghua
The characteristics of swell-shrinkage kinetic curve during sintering the compact of W-Ni- Fe 10% with primary mean grain size less than 200 nm in hydrogen atmosphere was researched by high tem- perature dilatometer. And the effects of the average size of tungsten particle and green density on shrinkage commence temperature, sharp shrinkage temperature and shrinkage rate were also studied. It shows that shrink age commence temperature and sharp shrinkage temperature of the compact with ultrafine grain are 970℃ and 1240 ℃ respectively. The maximum shrinkage rate is 9 μm/℃. The shrinkage ratio decreases with the increase of green density and increases with the increase of sintering temperature.
{"title":"Shrinkage Kinetics during Sintering W-Ni-Fe Heavy Alloy with Ultrafine Grain","authors":"Wang Jun, Z. Liying, G. Zhimeng, Lin Tao, Wu Chengyi, Wu Qinghua","doi":"10.2497/JJSPM.50.912","DOIUrl":"https://doi.org/10.2497/JJSPM.50.912","url":null,"abstract":"The characteristics of swell-shrinkage kinetic curve during sintering the compact of W-Ni- Fe 10% with primary mean grain size less than 200 nm in hydrogen atmosphere was researched by high tem- perature dilatometer. And the effects of the average size of tungsten particle and green density on shrinkage commence temperature, sharp shrinkage temperature and shrinkage rate were also studied. It shows that shrink age commence temperature and sharp shrinkage temperature of the compact with ultrafine grain are 970℃ and 1240 ℃ respectively. The maximum shrinkage rate is 9 μm/℃. The shrinkage ratio decreases with the increase of green density and increases with the increase of sintering temperature.","PeriodicalId":17554,"journal":{"name":"Journal of University of Science and Technology Beijing","volume":"2673 1","pages":"107-110"},"PeriodicalIF":0.0,"publicationDate":"2003-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79814929","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}
{"title":"Thermodynamic Assessment of the Ni-Ga System","authors":"Yuan Wenxia, Ust Beijing","doi":"10.1361/10549710417696","DOIUrl":"https://doi.org/10.1361/10549710417696","url":null,"abstract":"","PeriodicalId":17554,"journal":{"name":"Journal of University of Science and Technology Beijing","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87053434","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：