Published in Journal of Iron and Steel Research International
The thermal conductivity of the mould fluxes containing transition metal oxides was measured by hotline method at different temperatures. The relationship between the thermal conductivity of mold fluxes and the contents of transition metal oxides was discussed. The synthetic slags were composed of 30.0%–35.4% CaO, 34.7%–38.6% SiO2, 6% Al2O3, 9% Na2...
Published in Journal of Iron and Steel Research International
The growth of proeutectoid ferrite in Fe-0. 15%C-0. 8%Mn carbon steel during continuous cooling process was observed in-situ and tracked dynamically by using a high-temperature confocal scanning laser microscope (HTC-SLM), and the growing process was also investigated. The growth regularity of proeutectoid ferrite plates within austenite was obtain...
Published in Journal of Iron and Steel Research International
Within the production chain of longitudinal profiled (LP) plates and tailor rolled blanks (TRB), variable gauge rolling (VGR) represents the vital important forming stage, in which shape and properties are tailored to satisfy customers’ requirements. It is of vital importance to reveal the relationship between work-piece horizontal velocity and rol...
Published in Journal of Iron and Steel Research International
Dynamic recrystallization of 304N stainless steel was investigated at deformation temperatures of 900–1300 °C and strain rates of 0. 01–10 s−1 by a Gleeble-1500 thermo-mechanical simulator. And the microstructure evolutions of specimens with different deformation temperatures were observed by using a transmission electron microscope. Results indica...
Published in Journal of Iron and Steel Research International
As stabilizing elements added into ultra-pure ferritic stainless steels, niobium and titanium react with carbon and nitrogen to form carbonitrides and have great effects on the ratio of equiaxed zone and the grain size of solidification structure of ingots, which remarkably affect the quality of cold-rolled sheets. Combined with thermodynamic calcu...
Published in Journal of Iron and Steel Research International
Bending process is one of the most significant fields of application of sheet metal die. Sheet metals are exposed to some spring-back or spring-forward depending on elastic deformation following bending process. S235JR (1. 0038) materials having a thickness of 4 mm were bent with 90° punches having 5 different tip radiuses. The bending process was ...
Published in Journal of Iron and Steel Research International
Different samples of TRIP (transformation induced plasticity) steel obtained by two different hot-rolling schedules are investigated by using a SEM (scanning electron microscope). The microstructure is characterized by using an OM (optical microscope) for phase distribution and by EBSD (electron backscatter diffraction) for texture and phase mappin...
Published in Journal of Iron and Steel Research International
The supersonic laser deposition (SLD) is a new fabrication process which combines the supersonic powder stream found in cold spray with laser heating of the deposition zone. Because of the instantaneity of particles impact, the deformation behaviors and the adhesion behaviors of particles impacted on the substrate by SLD cannot be well investigated...
Published in Journal of Iron and Steel Research International
The evolution of precipitates of S31042 steel during 700 °C aging was investigated by using a scanning electron microscope, a transmission electron microscope, and electron energy spectrum technology. The various combinations of M23C6, MX, NbCrN, and σ and G phases in the steel were found at different aging states. In the beginning of aging, M23C6 ...
Published in Journal of Iron and Steel Research International
The multi-wedge cross rolling process of forming balls is described. The process tool for rolling 8 balls with a diameter of 35 mm is presented. The course of the rolling process, distributions of forming forces as well as maps of effective strain and temperature in the obtained balls are presented by finite element modeling (FEM). Experimental tes...
