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Authors: M. Coloschi, V. Ramos, G. R. Gomez, M. Valdez, D. Tieppo and E. Martinez
Toughness of high-strength line pipes with longitudinal seam produced by Electric Resistance Welding (EW) is of paramount importance. During production, impact properties of the EW line are improved by a localized Post-Weld Heat-Treatment (PWHT). The heat treatment is intended to refine the structure and remove brittle constituents of the Heat Affected Zone (HAZ).
Authors: Xiang Li, Yanping Bao, Linzhu Wang, Lu Lin, Qiyi Zhang
The ladle bottom argon blowing technology was widely used in steel refining. It can not only homogeneous liquid steel temperature and composition, but also can remove inclusions by dispersed small bubbles. However, there were some problems about reoxidation of molten steel and corrosion of ladle barrel in actual production caused by unreasonable of plug position and inaccuracy of argon flow control.
Hot Ductility Comparison of Percent Reduction In Area And Strain Energy For The Continuous Casting Of Nb-Microalloyed Steels
Authors: Steven G. Jansto
This research shows that high carbon equivalent microalloyed steels which exhibit inherently lower hot ductility, as measured by percent reduction in area at elevated temperature, still exhibit sufficient ductility in industrial casting operations to satisfactorily meet the unbending stress and strain gradients existing in the straightening section of most casters.
Authors: Libin Zhu, Shufeng YangR, Jun Fan, Xiangzhou Gao, Jingshe Li
In this paper, high-temperature experiments were first carried out to study the modification kinetics of Mg0-Al203 inclusions by Ca-treatment, and then a kinetic model for modification of Mg0-Al203 inclusions by Ca-treatment was developed.
Authors: Wang Chao, Zhang Hui, Wang Ming-lin, MaZhong-Wei, Zhao Pei
The electromagnetic stirring (EMS) has been proved to be an effective technique for optimizing the billet quality. In this study, the M-EMS in the round caster was simulated by mechanical agitation which was developed innovatively and the effect of EMS on the flow field and inclusion removal behavior in the mould was studied.
A Coupled Model Of Microsegregation And Tin Inclusion Precipitation During Solidification Of Gcr15Simn In Esr Process
Authors: Liang Yang, Shijian Li, Guoguang Cheng, Min Zhao, Guiping Feng
The microsegregation and non-metallic inclusion TiN precipitation during solidification of GCrl5SiMn in ESR process is strongly harmful to steel properties. Many studies have been reported models of solute elements microsegregation during solidification, for example, Scheil model, Brody-Flemings model, Clyne-Kurz model, Ohnaka model, however, all models mentioned above are not taking the influence of inclusion precipitation on solute elements microsegregation into consideration, which will result in the overestimate of microsegregation degree.
Authors: Sankaran Srinivasan, K. Manikandan, Giridhar Venkatesan
The success of a part produced for its world class quality depends upon the allied processes like heat treatment & plating. Even though the guidelines for doing a good heat treatment are available, the selection is limited as the approach available is qualitative in nature.
Influence Of Stored Energy In Cold Rolled Sheet On The Formation Of Austenite During The Subsequent Intercritical Annealing Of V-Bearing Dual-Phase Steels
Authors: Yu Gong, X. Liang, M. Hua, Juha Uusitalo and A. J. DeArdo
Recent research has shown an important relationship between the stored energy of the hot band, the increase in stored energy in cold rolling and the formation of austenite during intercritical annealing of V-bearing DP 980 steels. The stored energy is measured by combining SEM/FEG/EBSD with newly developed software that sums the subgrain boundary energy in the steel.
Authors: Alan Mario Gonzalez Villarreal, Luis Adolfo Leduc Lezama1, Rafael Mercado Solis, Guillermo Barrera, Fernando Gonzalez
Friction during cold rolling is a complex phenomenon that is not yet fully understood. In industrial rolling processes, the correct prediction of the friction coefficient allows process optimization. Cold rolling friction has traditionally been studied using laboratory mills under controlled experimental conditions.
Microstructural And Computer Modeling Study Of The Annealing Behavior Of Vanadium Bearing Hsla Steel After Cold Rolling
Authors: R. Ordonez, G. Wang, Z. Liu, J. Smiley, R. Moses, and C.I. Garcia
The annealing behavior of commercial Vanadium bearing HSLA steel was studied using different techniques such as OM, SEM, and electron backscattered diffraction (EBSD). The Kernel Average Misorientation and Sub-grain method were used to measure the local grain misorientation, the changes in stored energy and to calculate the percent recrystallization after annealing.