The effect of cold metal transfer (CMT) mode on ultra-precision machining (UPM) was investigated to explore phase transformation and potential improvements surface integrity for a wire arc additive manufactured (WAAMed)Ti–6Al–4V alloy part. Both CMT + Pulse (CMT P) modes are taken into account, which is proved be the stable methods fabricate Ti–6Al–4V components. calculation result shows that heat input P higher than mode. In reheated conditions mode, α′ → α+β occurs, leads decrease in...

The development of clean energy resources, including hydro power, plays an important role in protecting the global environment. Multi-layer bellows are key components and widely used power plants. Due to special multi-layer structures, conventional arc welding is prone defects pores insufficient fusion when fabricating or repairing such bellows. Precise laser with a high density low heat input has potential join high-quality manner. In this study, comparative investigation was conducted on...

Cryogenic technology is a vital part of our society, not only in lives, but also the field cutting-edge technology. The research and application cryogenic involved many important projects countries even world, such as aviation, aerospace, energy, transportation, medicine. With its high specific strength modulus, carbon fiber reinforced resin matrix composite materials have gradually become key material for aerospace vehicles, with significant advantages reducing structural weight improving...

To improve the weldability of 6061 aluminum alloy and mechanical properties welded joints, ultrasonic was introduced into welding process. The microstructure changes joints under different power were studied, their effects on analyzed. grain size calculated, distribution precipitated phases observed by EBSD technique. results show that cavitation acoustic flow produced vibration can refine joint, reduce nearly 50%. It promotes transition elements to weld eliminates segregation strengthening...

In this study, a WC-reinforced Ni-based surfacing layer was prepared on Q235 steel plate by plasma arc welding. The effects of nano-Y2O3 with different contents (0 wt.%, 0.4 0.8 1.2 and 1.6 wt.%) the microstructure, phase composition, microhardness, wear resistance were studied scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), microhardness test, pin-on-disk test. results show that composition γ-Ni, FeNi3 solid solution, WC, W2C, M23C6, M6C,...

In this paper, an equimolar blend of bisphenol A dipropargyl ether and cyanate ester was selected to study the effect different catalysts on curing reaction a blended resin system, thermal stability mechanical properties catalytically cured system were investigated. Acetylacetone salts transition metals dibutyl ditin laurate reduced temperature AF-type di ester, copper acetylacetonate at mass fraction 0.3% significantly less than 473 K. Bisphenol pr-polymerized equimolarly with E-type also...

Abstract Two new complexes, [Mn(3-NbsglyH)2 (H2O)4]·2H2O (1,3-NbsglyH2 = (3-nitrobenzenesulfonyl-glycine acid) and [Ni(4-Cbsgly)(bipy)2]·2H2O (2,4-CbsglyH2 (4-chlorobenzenesulfonyl-glycine acid, bipy 2,2-bipyridine), have been synthesized characterized by elemental analysis, IR, TG single-crystal X-ray diffraction. Complexes 1 2 are both monoclinic system, which assembled strong intermolecular hydrogen bonds into the one-dimensional chain, that in further connected to form three-dimensional...

Q960 high-strength steel is widely used in pressure vessels, bridges, offshore platforms and other important structural components because of its high strength good plastic toughness, but alloy elements added to this kind have strong hardenability, especially after welding, so the toughness cannot meet requirements, which limits application a wider range. In paper, from point view metallurgical treatment weld, goal improve weld metal order analyze influence Zr on welding process...

Abstract The microstructure, element distribution and pitting corrosion resistance of Gas Tungsten arc welding (GTAW) duplex stainless steel welded joints under 100% argon (Ar) 98% Ar + 2% nitrogen (N 2 ) shielding gas were studied by optical microscopy (OM), scanning electron (SEM), energy dispersive spectroscopy (EDS) electrochemical methods. These results show that the addition N to promotes formation austenite ( γ phase in weld joint. Also, is dendritic ferrite δ phases heat-affected...

Two new transition metal complexes [Cu(4-Cbsgly)(phen)]·0.5H2O (1), [Ni(4-Cbsgly)(phen)2]·3H2O (2) [4-CbsglyH2 = (4-chlorobenzenesulfonyl-glycine acid, phen 1,10-phenanthroline) were synthesized and characterized by elemental analysis, IR, TG single-crystal X-ray diffraction. The 1 2 are assembled various kinds of hydrogen bonds π-π stacking interactions into the 1D chain 2D layer, respectively. Two-dimensional layer in further connected to form sandwich-like structure through weak O–H···O...

The fiber laser assisted by MIG source was used to weld a low alloy high-strength steel(HSS) in butt configuration. Weld appearance, pore formation, micro-hardness, tensile strength and fracture characteristic were investigated. results of high-speed video showed that the effects wire feed rate power on degree arc plasma interacting with laser-induced influenced various welding speed. mechanism suppression thin plate different from thick plate. lower linear heat input was, fewer porosities...

This study systematically investigated the effect of aging temperature on microstructure, impact toughness and pitting behavior flux-cored arc welded 2205 duplex stainless steel joint. 600°C–900°C treatments were carried out with 1-hour insulation. The results showed that ferrite (α) underwent serial metallurgical transformations increasing temperature. formation sigma (σ) phase was detected in weld zone (WZ) under all temperatures due to eutectoid reaction α phase, while peak content σ...

High-strength low-alloy (HSLA) steel is used in important structural members because of its strength and plastic toughness. Q960 HSLA obtained by adding an appropriate amount alloy elements quenching tempering treatment on the basis ordinary low-carbon steel. This kind has strong hardenability due to added. Cold cracks, embrittlement softening heat-affected zone easily occur after welding. In particular, low-temperature impact toughness cannot meet requirements limits use. this paper,...

In this paper, Fe-Cr-C-N-Al-Y wear-resistant surfacing alloy was prepared by open arc with self-shielded flux-cored wire. The wear properties of the were analyzed MLS-23 rubber wheel wet sand tester. phase composition and microstructure XRD, SEM, EBSD TEM, strengthening mechanism discussed. results show that is composed M + γ-Fe M7C3 AlN. When content nano-Y2O3 0.456wt. %, formability best wetting angle smallest, which 50.8°, AlN precipitate most, grain smallest. At time, hardness value up...

Fe–Cr–C coatings with and without TiN additive were developed by harden-surface welding. The effect of on the wear resistance microstructure surfacing layer in discussed. Analyze refining mechanism primary M7C3 first-principles calculation. Rockwell hardness tester was used to examine layer. Abrasive test wet grinding wheel tester. X ray diffractometer (XRD), scanning electron microscope (SEM), energy spectrum analyzer (EDS), Transmission (TEM) other equipment for testing analysis. results...

In order to study the effect of element B on corrosion resistance stainless steel-based flux cored wire surfacing alloy, a steel layer was prepared surface carbon plate by melt electrode gas shielded welding, and then microstructure, electrochemical resistance, wear were analyzed. The results show that alloy presents M2B Fe3(C, B) phases based austenite. Boride formed in deposited metal has good resistance. Therefore, adding proper amount can significantly improve layer. When boron content...