Materials Literature
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Traditional process to produce electrode of alloy steel 30CrMnSiA1.2 t ESR ingot at Daye Special Steel is EAF+LF-rolling250 mm×250 mm Billet,by which the crack easily produced at top of ESR ingot.With using optimum process to produced ESR electrode:EAF+LF(VD)steelmaking-φ320 mm cast round electrode,controlling≤0.003Pb…
Water modeling experiments and numerical simulation for flow control device of24 t tundish at Chongqing Steel have been carried out to study influence of turbulence inhibitors with different size on fluid flow behavior by measuring residence time distribution (RTD ) curves and removal rate of inclusion s. The results…
With optimized process such as dry masonry brickwork joint ≤0.5 mm,MgO content in magnesium-carbon brick ≥75%,MgO content in refining slag≤20%,VD treating time decreasing from 45 min to 30 min and refining time with low viscosity slag decreasing from 45 min to 15min,the service life of slag line brick in an 100 t LF(V…
Martensite heat resistant steel 1Cr20Co6Ni2WMoV was melted by a vacuum induction fumace with 22.5 kg ingot and forged to 中16 mm bar.Heat treatment process of samples were quenching at 1060 ℃ for 1h oil cooling + cold treatment at -70℃ or- 192 ℃ for 2 h air cooling + tempering at 640 ℃ for 3 h air cooling. Test results…
Based on simulation of molten steel flow field in mold for 150 mm×150 mm billet and analysis on slag inclusion mechanism, the relative process parameters for concasting have been improved including increasing immersion depth of submerged nozzle to 120～135 mm from original 70～80 mm, enlarging lower vent diameter of sub…
With controlling sulphur content in steel≤0.020%,temperature fluctuation range of molten steel of df- ferent heat in tundish decreasing to 10 ℃ from original 25 ℃,adjusting mold water rate to 190～200 m3/h,controling casting rate0.55~0.75 m/min,the intemal crack reject rate for 260 mm×300 mm cast billet of steel 20CrMn…
The1.6～12.7 mm strip of L360 pipeline steel(0.08～0. 12C,0.10～0.25Si,1.10～1.30Mn,≤ 0.015P,≤0.008S,0.03～0.05Nb)was produced by hot metal desulphurization - 120 t converter melting - LF refining (argon stirring,feeding wire)- 160(220)mm slab concasting -2-stand Steckel mill flow sheet.The production data sta- tistic resu…
The deoxidization behavior of magnesium alloy (8% ~ 15% Mg) deoxidizer- AlMg, SiCaBaMg, SiCaBaAlMg to 0. 05% 〜0. 07% C steel has been studied by a 30 kg induction furnace with MgO crucible. Test results showed that with deoxidation using AlMg alloy contained 8% 〜10% Mg the oxygen content in steel decreased to 33.77 x…
0. 14C-0.35N austenite stainless steel 1Mn15Cr17Ni2N melted by 25t EAF-VOD+LF-680 kg ingot process. [N] was 0.040% and [O] was 0.0158% at end of VOD refining, and the analysis results indicated [N] 0. 139% and [0]0.0033% after nitrogen blown for 45 min in LF with blown nitrogen amount 50 m³ with blown nitrogen average…
The surface quality of0.72～0.82C φ5.5 mm wire for steel cord af tyre produced by different producers at home and abroad was tested and examined. The results showed that surface of wire produced at moet producers has no de- carburized layer and average thickness of oxidizing scale layer was ≤7.7 μm with thickness diffe…
The thermal deformation behavior of BH08G welded steel- 0.08C, 1.59Mn, 0. 34Mo, 0.1215 with strain rate ε 0.1~10.0 s-1at 950 ~ 1 050℃ has been studied by Gleeble-1500 thermal simulation machine. It is obtained by regression calculation of austenite recrystallization dynamics that relation between Zener-Hollomon parame…
According to measured solubility data of Thermo-Calc and concerned references, the equilibrium solid solubility formulae of Fe4N in austenite and in ferrite have been derived respectively as log[N]γ= 0.940 -479.4/T and log[N]α= 1.074 - 1 838/T. With considering free energy of Fe4N formation, the equilibrium solid solu…
In the preceding paper, we developed an athermal shear-transformation-zone (STZ) theory of amorphous plasticity. Here we use this theory in an analysis of numerical simulations of plasticity in amorphous silicon by Demkowicz and Argon (DA). In addition to bulk mechanical properties, those authors observed internal fea…
We present explicit analytic, twice‐differentiable expressions for the temperature‐dependent anisotropic step line tension and step stiffness for the two principal surfaces of face‐centered‐cubic crystals, the square {001} and the hexagonal {111}. These expressions improve on simple expressions that are valid only for…
The synthesis of a series of heterometallic rings and chains is reported. The family is based on the octanuclear cages of general formula [H(2)NR(2)][M(7)M'F(8)(O(2)CR')(16)], where M is a trivalent metal (Cr, Fe, V, Al, Ga or In), M' is a divalent metal (Mn, Fe, Co, Ni, Mg, Zn, Cd), R is a linear alkyl chain and O(2)…
A variety of layered transition metal oxides and layered double hydroxides have been exfoliated into unilamellar nanosheets such as Ti0.91O2, Ca2Nb3O10, MnO2, and M1-xIIAlx(OH)2 (MII=Mg, Co, Zn, Ni). The exfoliation was promoted via the high degree of swelling driven by intercalation of quaternary ammonium ions for th…
The effects of KOH activation on pore structure of ordered mesoporous carbons were analyzed by transmission electron microscopy, powder X-ray diffraction and argon adsorption. The activation led to remarkable increases in micropore volume and BET surface area up to 1.0 mL g−1 and 2700 m2 g−1, at the expense of the mes…
A chemoselective and layered growth approach has been developed for the synthesis of dendrimers, combining Click chemistry with traditional esterification/etherification reactions, without the need for activation steps and with excellent overall yields.
Alloyed catalysts receive considerable attention, because of their unique catalytic properties; they often show higher selectivity, activity, and stability compared to the pure metal particles. To provide insights in the origins of these features, we report the structure and the interaction of hydrogen with each of th…
Triple-shape materials have recently been introduced as a promising class of active polymers, that can change on demand from a first shape (A) to a second shape (B) and from there to a third shape (C). Here, the dual-shape capability of such a triple-shape polymer network system having two distinct melting transitions…