© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Volume 85, Issue 2
Version of Record online: 4 FEB 2014 | DOI: 10.1002/srin.201470021
Cover Caption: A mathematical model of a top blown converter, which was based on a physical model of a 30 t vessel, has been developed in this study as described by Xiaobin Zhou and co-workers on page 273. The cover shows the top view of the impinging jet from the simulation results.
Version of Record online: 4 FEB 2014 | DOI: 10.1002/srin.201470022
Version of Record online: 4 FEB 2014 | DOI: 10.1002/srin.201470023
Ernst Gamsjäger, Robert E. Werner, Wolfgang Schiller and Bruno Buchmayr
Version of Record online: 28 MAY 2013 | DOI: 10.1002/srin.201200281
Sharp as well as thick interface models have been developed to describe austenite-to-ferrite transformation kinetics. This work confirms that diffusion processes in the interface (solute drag) and diffusion of interstitial components like carbon control the kinetics of the austenite-to-ferrite transformation in low-alloyed steels. The models are compared with and verified by the results of experimental investigations.
Naqiong Zhu, Qihao Wu, Yanlin He, Xiaogang Lu, Lin Li and Pengfei Hu
Version of Record online: 4 SEP 2013 | DOI: 10.1002/srin.201300098
Addition of Ni content inhibits the carbon diffusion during bainitic isothermal holding resulting in the bainite morphology consisting of laths of bainitc ferrite and film-type retained austenite with nearly equal width which increases the strength of TRIP steels. More volume fraction of film-type retained austenite greatly increases the stability of retained austenite without contribution to the total elongation.
Xinhua Wang, Xiugang Li, Qiang Li, Fuxiang Huang, Haibo Li and Jian Yang
Version of Record online: 19 JUN 2013 | DOI: 10.1002/srin.201300044
The characteristics, origin, and controlling method of stringer shaped B type non-metallic inclusions in pipeline steel are studied, their composition are mainly of CaO–Al2O3 system with lower melting temperatures. A new strategy for control of B type inclusions in linepipe steel plates is adopted, than the inclusions in steel plates were all of high melting temperature CaO–CaS system and the severities of B-type inclusions have been lowered from “≤2.0” to “0.”
Xue-min Yang, Jin-yan Li, Peng-cheng Li, Meng Zhang and Jian Zhang
Version of Record online: 27 AUG 2013 | DOI: 10.1002/srin.201200215
The Raoultian activity coefficient of Si and of Fe in the infinitely dilute solution of Fe–Si binary melts at temperatures of 1693, 1773, 1873, and 1973 K have been determined from the calculated mass action concentrations Ni of structural units in Fe–Si binary melts based on the atom and molecule coexistence theory (AMCT). The figure shows the accurate agreement between the calculated mass action concentration NSi of Si and the calculated activity of Si referred to 1 mass percentage of Si as standard state in the full composition range of Fe–Si binary melts at temperatures of 1693, 1773, 1873, and 1973 K, respectively.
Seshadev Sahoo and Sudipto Ghosh
Version of Record online: 10 JUN 2013 | DOI: 10.1002/srin.201200262
Numerical simulations for high speed twin roll strip casting is carried out to estimate the time which is required for steady state condition to set in and solidification front speed during the transient stage. By using this model it is possible to determine the transient length of the cast strip which needs to be rejected during the starting process.
Rajesh Jha, Prodip Kumar Sen and Nirupam Chakraborti
Version of Record online: 3 SEP 2013 | DOI: 10.1002/srin.201300074
Novel nature inspired strategies are used to construct models of Productivity, CO2 emission, and Si content of an operational Blast furnace and the optimum tradeoffs between the level of CO2 emission and productivity at different Si levels are computed and analyzed in detail. Also, comparisons are made with the results of a thermodynamic model and those from some commercial software.
Shengli Wu, Biyang Tuo, Lihua Zhang, Kaiping Du and Ying Sun
Version of Record online: 20 JUN 2013 | DOI: 10.1002/srin.201300061
A high temperature characteristic evaluation method of BF iron bearing burden (IBD) has been put forward. It provides more information under the same experiment conditions. It evaluates high temperature behavior of IBD accurately through dividing into three temperature ranges. The permeability of charge column can be analyzed by pressure drop and characteristic value of cohesive zone and dropping zone.
Xiangliang Wan, Kaiming Wu, Gang Huang and Ran Wei
Version of Record online: 1 JUL 2013 | DOI: 10.1002/srin.201200313
Single, multiple, and sympathetic nucleation of acicular ferrite are observed. Acicular ferrite laths or plates effectively partitioned austenite grains into many smaller and separated regions. The later formed bainite at lower temperature is confined in those smaller regions, thus resulting in the fine-grained mixed microstructures of acicular ferrite and fine bainite plate packets.
Fernando Martell, Klaus Krüger, Armando Llamas and Osvaldo Micheloud
Version of Record online: 17 JUL 2013 | DOI: 10.1002/srin.201200217
The time and frequency domain analysis of the voltage difference between a virtual-neutral, from the delta connected transformer, to the furnace shell ground voltage, showed relevant information of the heat process like arc stability, arc slag coverage, and electrical circuit imbalance. The proposed arc indexes can be considered as process variables to improve the power control of Electric Arc Furnaces.
Serafín Ferreira, Alejandro Cores, J. Ignacio Robla, Luis Felipe Verdeja, Iñigo Ruiz-Bustinza, Fernando García-Carcedo and Javier Mochon
Version of Record online: 18 DEC 2013 | DOI: 10.1002/srin.201300370
During the pyroconsolidation of magnetite pellets in an aerobic atmosphere, the mineral practically oxidizes in the beginning stages of the process. However, as the temperature increases, the hematite dissociates into magnetite. The temperature at which this phenomenon occurs depends on the additives present and is significantly lower than that corresponding to pure magnetite. In this paper a series of magnetite pellets were formed, varying the alkalinity, and pyroconsolidated at temperatures ranging from 1050 to 1350°C.
Xiaobin Zhou, Mikael Ersson, Liangcai Zhong, Jingkun Yu and Pär Jönsson
Version of Record online: 13 DEC 2013 | DOI: 10.1002/srin.201300310
A simplified model consisting of the converter has been used in the mathematical simulation. The comparison between the physical model and the mathematical model shows that the simplified top blown model can successfully be used to calculate long-time simulations, and the mixing time calculations in frozen field can save a large amount of time compared to the simulation time using a transient flow field.