Materials Literature
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The continuous cooling transformation(CCT)curves,structure and phase transformation of quality spring steel 60Si2CrVAT with different finishing rolling temperature and cooling rate have been examined and studied by Gleeble-1500 thermal mechanical simulator,optical microscope and transmission electron microsope. Result…
The Φ160 mm non-quenched-tempered steel S38MnSiV(0.38~0.45C,0.55~0.75Si,1.40～1.55Mn, 0.08～0. 15V,0.020~0.050S,≤0.025P) has been developed by 30t EBT EAF-40tLF+VD-3. 16tingot-800/ 650×4 mill flow sheet. Examination results showed that he oxygen content in finished products was (8～13)×10-6nitrogen content(128～186)×10-6a…
The structure and properties of electroslag remelting steel Cr14Mo4(1.03C,14.36Cr,3.98Mo)Φ22 mm hot rolled products annealed at 750~950 ℃,quenched at 950～1200 ℃ and tempered at 450～550 ℃ have been studied. Results showed that HB hardness value of steel annealed at(890±20)℃ was 207~255;structure of steel quenched at 11…
The effect of two processes of calcium treatment: two step process (LF + Ca-Si wire feeding - VD + Ca- Si wire feeding) and one step process (LF - VD + Ca-Si wire feeding) at Xiangsteel on morphology of inclusions and mechanical properties of Nb-Ti microalloying grade E hull steel (0. 10%C) has been studied by thermod…
The morphology and component of insulating coating of non-oriented silicon steel before and after stripping have been analyzed and studied by established adhesive model of thick coating,electron probe micro analyzer(EPMA)and glow discharge spectroscopy(CDS).Results showed that the adhesion mechanism of insulating coat…
The 0Crl8Ni9 clean stainless steel is produced by pretreated hot metal - 75 t K-OBM-S - VOD - LF flow sheet. During LF refining for steel 0Cr18Ni9 as bottom argon blown stirring power decreased from 20 ~40 W/t to 13 ~21 W/t with feeding available Ca-Si wire according to Ca/Al≈0.1, the oxygen content and Al2O3content i…
Phase transformation of 0. 13Nb microalloying low carbon steel with deformation in non-crystallization temperature zone(as deformation≥50%,crystallization occurred)and continuous cooling with cooling rate0.1～50 ℃/s has been studied by using thermecmastor-Z thermal simulation test machine and the effect of thermal defo…
The second phase particles in simulated weld(H08C weld wire-0.06C,1.44Mn,0.24Mo,0.04Ti, 0.01V)and coarse grained heat affected zone(CGHAZ)of Ti-V-Nb microalloyed steel(0.08C,1.29Mn,0.02Ti, 0.04V,0.04Nb)have been studied by using carbon extraction replica technique.Results showed that size of most second phase particle…
The single pass thermal compression test of 0.019C and 0.052C two kinds of ultra-low carbon bainite (ULCB)steel with deformation 5%~50%,strain rate 2s-1at 1100 ℃ has been carried out by Thermechmastor-Z thermal simulation machine.Results showed that as deformation was lower than 40% the deformation-recrystallization b…
The high carbon bearing steel is produced by 60 t LD-LF+VD-CC flow sheet at Shijiazhuang Steel. The statistical data with 602～2449 heats showed that in LD steelmaking the average end-point carbon was 0. 15% by catch carbon practice, the average end-point [P]0.012% and the[S]0.034%. After LF+VD refining the average oxy…
In the present investigation, X-ray photoelectron and X-ray excited Auger electron spectroscopy analyses of the principal core levels (O 1s, Cu 2p, and Cu LMM) of Cu2O and CuO nanosystems are proposed. The samples were obtained by chemical vapor deposition starting from a novel second-generation copper(II) precursor,…
Chitosan, the deacetylated derivative of chitin, is a natural D-glucosamine polymer that can be extracted from the shells of seafood such as prawns crabs and lobsters. It can be used as a flocculent, plant disease resistant promoter, anti-cancer agent, wound healing promotion agent and antimicrobial agent. The aim of…
Photoinduced electron transfer in a self-assembled single-wall carbon nanotube (SWNT)-fullerene(C60) hybrid with SWNT acting as an electron donor and fullerene as an electron acceptor has been successfully demonstrated. Toward this, first, SWNTs were noncovalently functionalized using alkyl ammonium functionalized pyr…
The microstructure of the Zn/ZnO core/shell nanoparticles synthesized by laser ablation in liquid medium can be facilely controlled. With the surfactant concentration increased over the critical micelle concentration, the nanoparticle transformed from pure ZnO to a Zn/ZnO core/shell structure. Further, with a decrease…
The case of a Feshbach shape resonance in the pairing mechanism for high T c superconductivity in a crystalline lattice of doped metallic nanotubes is described. The superlattice of doped metallic nanotubes provides a superconductor with a strongly asymmetric gap. The disparity and different spatial locations of the w…
The ability to predict the morphology of crystals formed by chemical reactions is of fundamental importance for the shape-controlled synthesis of nanostructures. Based on the atomistic mechanism for crystal growth under different driving forces, we have developed morphology diagrams to predict regimes for the growth o…
The excitonic recombinations in hexagonal boron nitride (hBN) are investigated with spatially resolved cathodoluminescence spectroscopy in the ultraviolet range. Cathodoluminescence images of an individual hBN crystallite reveals that the 215 nm free excitonic line is quite homogeneously emitted along the crystallite,…
Piezoresponse force spectroscopy (PFS) has emerged as a powerful technique for probing highly localized polarization switching in ferroelectric materials. The application of a dc bias to a scanning probe microscope tip in contact with a ferroelectric surface results in the nucleation and growth of a ferroelectric doma…
After over 40 years of use in biomedical applications, polyurethanes remain one of the most popular biomaterials due to their exceptional biocompatibility, mechanical properties and versatility. However, failure of polyurethane based pacemaker leads and breast implant coatings in the late 1980s brought the long term s…
Recently, magnetic silica-based nanospheres have received great attention and displayed magnificent potential for bioimaging and therapeutic purposes. This study provided a way to accelerate drug release from magnetic-sensitive silica nanospheres by controlled bursting to a therapeutically effective concentration by a…