Iron & Steel Society of IranInternational Journal of Iron & Steel Society of Iran2981-03888220110701Developing Very Fine Nanopearlitic Structure in a High Carbon Steel Wire before DrawingDeveloping Very Fine Nanopearlitic Structure in a High Carbon Steel Wire
before Drawing146500ENS. SadeghpourDepartment of Materials Engineering, Isfahan University of Technology, Isfahan, 8415683111, Iran.Journal Article20140705The effects of steel wire patenting process parameters on very fine interlamellar spacing in the pearlitic steel wire were investigated and the optimized condition of the process was achieved. In this work, the initial nanopearlitic structure was obtained in a 0.72 wt% carbon steel wire before the wire drawing process. The results were the minimum interlamellar spacing of 35 nm and maximum ultimate strength of 1960 MPa for austenitizing at 910 ˚C and isothermally transforming to pearlite at 510 ˚C.https://journal.issiran.com/article_6500_fefba97cdd7ff2344b04130142de691e.pdfIron & Steel Society of IranInternational Journal of Iron & Steel Society of Iran2981-03888220110701The Effect of CaF2 Content in Hot Metal Pretreatment Flux Based on LimeThe Effect of CaF2 Content in Hot Metal Pretreatment Flux Based on Lime586501ENH. AbdeyazdanFaculty of Engineering, University of Wollongong, NSW, AustraliaH. EdrisDepartment of Materials Engineering, Isfahan University of Technology, Isfahan, 8415683111, IranM. H.AbbasiDepartment of Materials Engineering, Isfahan University of Technology, Isfahan, 8415683111, IranJournal Article20140705This research was conducted for the purpose of studying the effect of CaF2 content in the composition of hot metal pretreatment flux, based on lime. It was followed in regards to the importance of fluorine amount decrease in hot metal pretreatment and steel making processes. For this purpose, lime based fluxes including 40, 30, 20 and 10 percent calcium fluoride were prepared and hot metal pretreatment experiments were done in an induction furnace at the temperature range of 1350-1450°C. The obtained results indicated that by using the flux containing 30 percent calcium fluoride, simultaneous removal of phosphorous and sulfurous are in the highest level which is known as a result of slag making with suitable liquid phase volume and adequate basicity. On the other hand, a flux with 20 percent CaF2 caused a small fall in the refining process results. In regards to the harmful effects of fluorine on refractory walls and considering environmental issues, a flux including 20 percent fluorine was introduced as a providing optimum condition. The results have been studied with respect to CaO-CaF2 equilibrium phase diagram, as well as the effect of CaF2 amount on phosphate capacity and lime efficiency of slag.https://journal.issiran.com/article_6501_82692d66e74970c9475d02171b41fc46.pdfIron & Steel Society of IranInternational Journal of Iron & Steel Society of Iran2981-03888220110701Effect of Water Gas Shift Reaction on the Non-Isothermal Reduction of Wustite Porous Pellet Using SyngasEffect of Water Gas Shift Reaction on the Non-Isothermal Reduction of
Wustite Porous Pellet Using Syngas9156502ENM. S.ValipourHeterogeneous Reactions Research Group, School of Mechanical Engineering, Semnan University,
P. O. Box: 35196-45399, Semnan, IranM. H.MokhtariHeterogeneous Reactions Research Group, School of Mechanical Engineering, Semnan University,
P. O. Box: 35196-45399, Semnan, IranJournal Article20140705Effect of water gas shift reaction (CO+H2O=CO2+H2) on wustite reduction has been investigated by a transient, non-isothermal mathematical model based on grain model. In this model, wustite porous pellet is reduced using Syngas, namely a mixture of hydrogen, carbon monoxide, carbon dioxide and water vapor. For this purpose, governing equations containing continuity equation of species and energy equation have numerically been solved by finite volume fully implicit method. The model has been validated by comparing it with experimental data from literature. It was found a good agreement between model results and experimental data. Model results have beenpresented for the pellet reduction including with and without Water Gas Shift Reaction (WGSR). It was foundthat in pellet scale model, the effect of WGSR is not considerable on the rate of wustite reduction and temperaturedistribution inside the pellet. However it affects the distribution of mole fraction of gaseous species considerably.https://journal.issiran.com/article_6502_e37ad6a1c771fa965239473d31bb2b2a.pdfIron & Steel Society of IranInternational Journal of Iron & Steel Society of Iran2981-03888220110701Effect of Deformation Temperature on the Mechanical Behavior of a New TRIP/TWIP Steel Containing 21% ManganeseEffect of Deformation Temperature on the Mechanical Behavior of a New
TRIP/TWIP Steel Containing 21% Manganese16196503ENM. EskandariSchool of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, IranA. Zarei-HanzakiSchool of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, IranJournal Article20140705In recent years, TRIP/TWIP steels have been the focus of great attention thanks due to their excellent tensile strength-ductility combination. The compression tests were performed at different temperatures from 25 to1000°C to study the mechanical behavior of advanced austenitic steel with 21% manganese plus bearing Ti. The results indicated that the plastic deformation is controlled by deformation-induced martensite and mechanical twinning from 25 to 100°C. However, at temperatures 200 to 1000°C the deformation twinning was merely observed. The occurrence of mechanical twinning at such high temperatures is a first-time observation in high manganese austenitic steels. Such mechanical twins led to grain refinement via grain partitioning.Iron & Steel Society of IranInternational Journal of Iron & Steel Society of Iran2981-03888220110701Study on Static Recrystallization Process in Duplex Stainless Steel 2205Study on Static Recrystallization Process in Duplex Stainless Steel 220520236505END. RajabiFaculty of Mechanical, Shahid Rajai Teacher Training University, Tehran, IranA. AbediFaculty of Mechanical, Shahid Rajai Teacher Training University, Tehran, IranGh. EbrahimiDepartment of Metallurgy and Materials Engineering, Faculty of Engineering, Ferdowsi University of MashhadJournal Article20140705Steel 2205 is one of the most famous duplex stainless steels. The microstructure of this steel composed of ferrite and austenite in similar amount. Therefore, in order to improve mechanical properties through microstructure, thermo mechanical processes such as controlled hot rolling and forging should be applied. It is not possible to employ the usual heat treatment. It shows the importance of our knowledge about the steel behavior during hot deformation and the effective mechanisms on the structural change. In the present study, hot compression in two pass process was performed on the 2205 specimens at the constant strain rate of 0.01 S-1and the temperature of 950°C, 1050°Cand 1150°C.The interval time between two pass were selected as 5, 10, 50 and 100 seconds and εc≈ 0.7εp was chosen. The results reveal that increasing interval time causes to increase the amount of wor softening before the recrystallization leads to decrease in grain size and hardness.https://journal.issiran.com/article_6505_5f72fc131df67712db82b650ded85c6c.pdfIron & Steel Society of IranInternational Journal of Iron & Steel Society of Iran2981-03888220110701Calculation of MnO Activity in Aluminate Slags at Various TemperaturesCalculation of MnO Activity in Aluminate Slags at Various Temperatures24266506ENL. ErfaniCeramic Department, Materials and Energy Research Center (MERC), P.O. Box 14155-4777, Tehran, Iran.E. Keshavarz AlamdariDepartment of Mining and Metallurgical Engineering, Amirkabir University of Technology, P.O. Box 15875-4413,
Tehran, Iran.0000-0003-0972-4817Y. GanjkhanlooResearch Center for Materials and Mining Industries Technology, Amirkabir University of Technology, P.O. Box
15875-4413, Tehran, Iran.Journal Article20140705In this research, the activity of MnO, produced during steel making in aluminate-rich slags, was investigated. According to thermodynamic equations and mathematical calculation, a series of relations was obtained for evaluation of oxide activity using Masson’s theory. The obtained relations were solved according to Levenberg- Marquardt method and using Matlab software. The results were correlated with the experimental Data. To derive relations, it was assumed that the solution has ideal behavior and the polymeric chains are linear. Finally, a relation was derived for oxide activity calculation which can be used in a wide range of concentration. MnO activity was investigated at various temperatures, using the experimental data and the obtained relation. Furthermore, the relation between equilibrium constant (K) and temperature was obtained. By means of the results the viscosity of melt can also be forecasted.https://journal.issiran.com/article_6506_1c594a5f313484867ef05a673f6c0fb7.pdf