Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Online ISSN: 1869-344X
Yong Ma and Gunther Brenner
Article first published online: 6 AUG 2014 | DOI: 10.1002/srin.201400104
Visualization of the computed free surface flow with inflow disturbances for different magnetic fields imposed in the marked region. The color represents the magnitude of velocity.
Hongfei Li, Guangwei Fan, Yan He, Jingang Bai, Caili Zhang and Peide Han
Article first published online: 28 JUL 2014 | DOI: 10.1002/srin.201400032
The initial secondary austenite phase (γ′) transformation occurs only in the cooling process and under hot tensile test condition. The γ′ precipitates in the temperature range of 950–1150 °C. The γ′/δ phase interface is coherent at 950 °C. However, the γ′/δ phase interface is not coherent at 1100 °C.
Wagner Viana Bielefeldt and Antônio Cezar Faria Vilela
Article first published online: 19 JUL 2014 | DOI: 10.1002/srin.201400112
In the production of special steels, inclusions have a significant influence on final product quality. The main objective of this study is to conduct a thermodynamic study aimed at preventing clogging problems during continuous casting (CC) and the formation of undesirable inclusions. Alumina (Al2O3), spinels, and calcium sulfide (CaS) are potential sources of defects during rolling and steel forging.
Omid Majidi, Frédéric Barlat, Myoung-Gyu Lee and Dong-Jin Kim
Article first published online: 16 JUL 2014 | DOI: 10.1002/srin.201400001
The FE simulation results demonstrate that the thinning tendency is limited by the simultaneous effects of friction coefficient reduction and springback after each detachment. It explains the increased drawability when the non-conventional forming mode is used compared to the conventional V-mode, as shown by the cup-drawing test results.
Yanhong Gao, Lingtao Bian and Zhongyu Liang
Article first published online: 15 JUL 2014 | DOI: 10.1002/srin.201400039
All the viscosities are within 0.2 Pa s for high temperature (over 1633 K in this experiment), which is less than that of the B-free slag. However, the value increases sharply when temperature is below break point temperature. In addition, an increase in the value of B2O3 content reduces significantly break point temperature and descent rate of temperature rises with increasing B2O3 content.
Qifeng Shu, Qingyun Luo, Lijun Wang and Kuochih Chou
Article first published online: 15 JUL 2014 | DOI: 10.1002/srin.201400117
Manganese is found to be enriched in spinel and liquid. The spinel increases in size with increasing of MnO and decreasing of CaO/SiO2 ratio. Disintegration is found in samples with increased MnO content and CaO/SiO2 ratio, which can be interpreted by increase of the size of Ca2SiO4 with increase of MnO content and CaO/SiO2 ratio.
Neethi Sushanthi and Joydeep Maity
Article first published online: 8 JUL 2014 | DOI: 10.1002/srin.201400054
The cooling curves are generated for 1080 steel through explicit finite difference based model considering constant values of thermal conductivity and specific heat. Grange–Kiefer approach is extended for determination of 50% transformation nose of CCT diagram. The cooling curves are solved against 50% transformation nose of CCT diagram. The Du/D versus D plots are generated for both finite and infinite severity of quenchant. The DC predicted by the model closely matches with the experimental DC showing only 8% deviation.
Mihails Ščepanskis, Andris Jakovičs, Egbert Baake and Bernard Nacke
Article first published online: 8 JUL 2014 | DOI: 10.1002/srin.201400118
The paper presents a methodology for identification of homogenization time of alloying inclusions in an induction crucible furnace where particles are admixed from a free surface of a melt. The methodology is based on the Large Eddy Simulation (LES) Euler-Lagrange calculation of inclusions and a regression model for size of the inclusions and their density. The regression model avoids the repeated LES calculations and, therefore, is suitable for an optimization task.
Josef Domitner, Menghuai Wu and Andreas Ludwig
Article first published online: 3 JUL 2014 | DOI: 10.1002/srin.201400059
The influence of small casting speed variations (715–735 mm min−1) on the metallurgical length in steel continuous casting is numerically investigated. The numerical simulations are based on an Eulerian two-phase solidification model. For a given casting configuration, the effects of strand surface bulging, shrinkage feeding, and mechanical softreduction are considered in different simulation cases.
Adam Szurdak and Gerhard Hirt
Article first published online: 1 JUL 2014 | DOI: 10.1002/srin.201300475
The manufacturing of micro lubrication pockets in stainless steel AISI 304 by hot micro-coining is investigated conducting finite element simulations and complementing experiments. Suitable process parameters and process limits are determined in this work. Process limits occurred for the coining of high strength materials at low process temperatures due to plastic deformation of the die.
Franc Vodopivec, Fevzi Kafexhiu and Borut Žužek
Article first published online: 26 JUN 2014 | DOI: 10.1002/srin.201400013
M23C6 particles size, number and dissolution velocity were deduced for tempering of a X20 steel at 800 to 550 °C. The dissolution of small particles increases the particle spacing for above one order of magnitude more than particles coarsening. By creep tests above 550 °C, particles spacing and creep rate are increased significantly by dissolution of small particles.
Ying Yang, Pär G. Jönsson, Zhijian Su, Jicheng He and Keiji Nakajima
Article first published online: 18 JUN 2014 | DOI: 10.1002/srin.201300463
Two kinds of a full type and a half type electromagnetic swirl flow generators (EMSFG) are studied. Moreover, those two type devices with different magnetomotive forces, frequencies as well as core distances are also investigated. Furthermore, the distribution of the magnetic flux intensity in molten steel and EMSFG and the distribution of the Lorentz force in molten steel are discussed by using different EMSFG structures and electromagnetic parameters.
David Lindström and Du Sichen
Article first published online: 17 JUN 2014 | DOI: 10.1002/srin.201400031
The desulfurization abilities of some commonly used agents, namely fluidized CaO, CaC2, commercial-CaO, Mg, MgO, CaO · MgO, and mixtures of commercial-CaO–Mg are studied and compared under the same experimental conditions in a laboratory furnace at 1773 K. The desulfurization mechanisms of CaO · MgO, commercial-CaO, and mixtures of commercial-CaO and Mg are also studied.
Szymon Lechwar, Łukasz Rauch and Maciej Pietrzyk
Article first published online: 16 JUN 2014 | DOI: 10.1002/srin.201400016
In this study, a classification model is developed for real-time prediction of various kinds of mill scales at typical hot rolling mill (HRM). In order to obtain input data, the automatic surface inspection system (ASIS) is used together with its classification model. Thereafter, novel procedure is introduced for further boosting of the accuracy of predictions by the use of hybrid classification concept.
Qianlin Wu, Wenge Li, Ning Zhong and Guoqing Wang
Article first published online: 10 JUN 2014 | DOI: 10.1002/srin.201400065
A novel method to synthesize Mo2NiB2 boride cermet coating on Q235 steel substrate, consisting of Mo2NiB2-type ternary boride as a reinforced phase and a γ-(Fe, Ni) base binder, is realized with laser cladding technique. The wear resistance of the Q235 substrate is greatly improved. As compared to 304 stainless steel, lower corrosion rate is obtained for the coating and pitting corrosion disappeare in particular.
Pavlina Pustejovska, Jiri Tuma, Vladimir Stanek, Jiri Kristal, Simona Jursova and Jiri Bilik
Article first published online: 10 JUN 2014 | DOI: 10.1002/srin.201400055
The paper deals with a mathematical model of counter-current flow in a blast furnace for a complex evaluation of iron-ore bearing raw materials reducibility. It is based on laboratory tests results and model calculation to predict the parameters of the reduction process and specific consumption of carbon in the blast furnace by Rist.
Xiurong Zuo and Rutao Li
Article first published online: 5 JUN 2014 | DOI: 10.1002/srin.201300465
The high-deformability pipeline steel with a ferrite/martensite dual-phase microstructure exhibits a superior strain aging resistance aging at 200–250°C for 5–15 min. The yield ratios are below 0.77 and the pipe still exhibits continuous yielding behavior, meanwhile tensile strength, uniform elongation and impact toughness do not experience significant change.
Anne M. Heikkilä, Juho H. Pussinen, Olli J. Mattila and Timo M. J. Fabritius
Article first published online: 27 MAY 2014 | DOI: 10.1002/srin.201400023
Chromite pellets, which are used as a part of SAF charge, are considered. The electrical behavior as a function of reduction degree of the chromite pellets is studied. It is found out that increase in reduction degree decreased the electrical conductivity measured in room temperature.
Hideki Ono, Keiji Nakajima, Shingo Agawa, Toshio Ibuta, Ryota Maruo and Tateo Usui
Article first published online: 22 MAY 2014 | DOI: 10.1002/srin.201400034
The relationships of the compounds in the Mg–Ti–Al–O system in equilibrium with molten iron are clarified at temperatures ranging from 1873 to 1973 K, and the thermodynamic calculations are conducted in avoiding Al2O3 or spinel MgAl2O4 formation and for inclusion control. It is shown that the equilibrium relations between those compounds and the composition of solutes in steel at 1973 K.
Ja-Yong Choi, Sun-Koo Kim, Youn-Bae Kang and Hae-Geon Lee
Article first published online: 21 MAY 2014 | DOI: 10.1002/srin.201300486
Composition evolution and number density of oxide inclusions in austenitic stainless steel during continuous casting are demonstrated by plant data as well as mathematical modeling. Origin of the inclusions is argon oxygen decaburization (AOD) slag, and the inclusions grow by subsequent oxide formation due to decrease of solubility limit of O, Al, Mn, Si, etc, during casting. A simple mathematical model is presented to account for the composition evolution.