Materials Literature
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The main goal of this study is to obtain a morphological confirmation of the contribution of coalescence to the fibril formation mechanism in microfibril reinforced composites (MFC) and in this way to explain the large differences in sizes of the starting spheres and the resulting long microfibrils, at rather modest d…
The corrosion behavior of mild steel in the presence of acetic acid (CH3COOH) and carbon dioxide (CO2) has been investigated using electrochemical techniques and weight-loss measurements. Electrochemical measurements have shown that the presence of acetic acid affects predominantly the cathodic reaction. The acetic ac…
Mathematical model for Nb( C ,N) precipitation in ferrite of micro niobium HSLA steel and calculated NbC nucleation radius, nucleation rate and growth rate in ferrite with 900 ~ 1200 ℃. austenization are presented. The test results by some authors indicated the precipitation of niobium carbo-nitride needed higher disl…
LF (ladle furnace)refining is a key metallurgical process for steelmaking cold rolled low carbon steel in BOF-LF-CSP flow sheet. The electric characteristics of a 120 t LF with 20 MW transformer and the power supply curves have been studied and optimized by established optimizing model to decrease refining time and im…
The numerical simulation of jet flow field of inner and out of Laval tube has been carried out by commercial software CFX4. 4, and the fluid flow distribution of axis symmetry turbulence jet out of tube with different stagnation pressure was analyzed to verify the k-ε turbulence model. Results showed that at environme…
A charge partition model for stainless steel smelting by K-OBM-S process at Taiyuan Steel has been established by a linear programming method including 13 decision variables in the model, minimum cost charge partition selected to be objective function and a set of linear equality and inequality about variable as restr…
The controlled rolling and cooling test for a V-Nb-Ti microalloying X100 pipeline steel(0.057C,1.84Mn, 0.25Mo) has been caried out by φ350 mm 4 roll mill in laboratory.Results showed that with initial rolling temperature 1100 ℃,finishing temperature 800~900 ℃ and end cooling temperature 100～400 ℃ the structure of X100…
The nitrogen removal from 0. 02% C molten steel in argon direct current (DC) glow plasma has been tested by a 25 kg vacuum induction furnace and the effect of argon glow plasma on kinetics of nitrogen removal from molten steel was studied. Results showed that the nitrogen removal speed and efficiency from molten steel…
The two- and three-dimensional models of 12 pass continuous rolling process for 150 mm × 150 mm billet to φ32 mm rod have been established by commercial finite element software MSC .Marc,and the simulation results of cross section shape,temperature of rolling stock during rolling process by two- and three-dimensional…
The plane-strain compression test with strain rate 10 s-1 and 50 s-1 at 900~1200 ℃ for forged dual phase stainless steel 00Cr22Ni5Mo3N has been carried out by Gleeble 3800 simulation test machine.Test results showed that with increasing deformation temperature the peak resistance to deformation of the dual phase steel…
The bubbles movement behavior in mold with cast speed 1.1 m/min,nozzle submerged depth 160 mm and gas flow rate in nozzle 0～15 L/min,and the effect of bubbles movement on impact depth,liquid level fluctuation and surface naked of mold powder have been studied by physical model in the ratio 0.4 to 1300 mm × 230 mm slab…
The effect of magnetic stirring current on carbon segregation of 180 mm×180 mm cast billet of gear steel 20CrMnTiHl and the effect of change of residual B content in steel during refining and casting on hardenability of steel have been tested and analyzed. Results showed that as magnetic stiring current decreased from…
BP ( Back Propagation) algorithm and genetic algorithm are combined into hybrid genetic algorithm of which the algorithm steps are first to locate a favorable searching region by genetic algorithm, then to search optimal coefficients in the located region by BP algorithm. An 100 t arc furnace end aim temperature neura…
The modified containing tungsten added V-N microalloying Cr5W tool steel-0.70～0.90C，≤1.00Si，0.20~0.60Mn，4.50~5.50Cr，1.00~1.50W，≤0.15Mo，≤0.3V，300×10-6～350×10-6N has been developed. Test results indicated that the structure of modified Cr5W steel quenched at 960 ℃ was martensite + carbide,of which the average HRC hardne…
The structure and properties of GCr4 bearing steel- 1.00%C,0.40%Cr,0.03%Mo,0.034%Al,10 × 10-6[O] heat treated by cross section induction heating and quenching (840±10)℃ + tempering (150～160 ℃) have been tested and researched. Results showed that after heat treated the case structure of CCr4 steel consisted of twinned…
According to production condition of an 180 t oxygen converter, the hydraulic simulation test of 1/15 model of oxygen top blown converter has been carried to get the effect of blown process parameters on bath. Results showed that as top blown gas flow rate was m 15.5 m3/h the change of oxygen lance position and gas fl…
The wear properties and wear surface morphology of three kinds of plastic die steel STAVAX (0.37C, 13.40Cr,0.31V), M330 (0.36C,12.88Cr,0.15Mo) and N702 (0.05C,16.30Cr,4.00Cu,4.00Ni,0.34Nb)with excellent corrosion resistance have been studied by M200 ring-block wear testing machine and scanning clectron micro-scope.Res…
The process of 100t DCEAF+LF+VD-220 mm×220 mm continuous billet -rolling mill to rollφ 55～70 mm GCr15 bearing steel bar has been developed. Process test results showed that with overheating temperature of molten steel during continuous casting ≤35 ℃,heating time of 220 mm×220 mm billet ≥8 h,rolling reduction 12.58~ 20…
An excellent arithmetic for flow rate control - expert and alterable parameter PID control arithmetic has been developed by combining theory with practice to realize optimal control for bottom blowing flow rate. The practical application of 30 ~ 120 t top and bottom combined blown converter indicated that the expert a…
According to characteristics of electroslag remelting (ESR) of steel, the unsteady-state model for ESR slab ingot has been established to simulate the temperature field of slab ingot during ESR with different remelting speed and analyze the effect factors on metal pool depth. Simulation results showed that during reme…