In situ X-ray diffraction and transmission electron microscopy has been used to investigate René 108 Ni-based superalloy after short-term annealing at high-homologous temperatures. Current work is focused on characterisation of γ' precipitates, their volume fraction, evolution the lattice parameter γ phases misfit in matrix. Material initial condition characterised by a high-volume fraction (over 63%) precipitates. Irregular distribution alloying elements was observed. Matrix channels were...

Abstract This work presents the influence of microstructural constituents on liquation crack formation in cast Ni-based superalloy, René 108. The investigation was divided into three parts: characterisation material's microstructure pre-weld condition, hot ductility studies and analysis cracking induced by gas tungsten arc welding process. Using advanced electron microscopy techniques it is shown that base material condition characterised a complex microstructure. phases identified 108...

The microstructure of a René 108 Ni-based superalloy was systematically investigated by X-ray diffraction, light microscopy, energy-dispersive spectroscopy, and electron microscopy techniques. material investment cast in vacuum then solution treated (1200 °C-2h) aged (900 °C-8h). γ matrix is mainly strengthened the ordered L12 γ′ phase, with mean γ/γ′ misfit, δ, +0.6%. typical dendritic considerable microsegregation alloying elements revealed. Dendritic regions consist secondary tertiary...

Abstract The aim of the present study was to characterize repair weld serviced (aged) solid-solution Ni-Cr-Fe-Mo alloy: Hastelloy X. welding a gas turbine part carried out using Gas Tungsten Arc Welding (GTAW), same process as for new parts. Light microscopy, scanning electron transmission microhardness measurements were techniques used determine post condition alloy. Compared solution state, an increased amount M 6 C carbide detected, but 23 carbides, sigma and mu phases not. aged...

The chemical composition of standard Inconel 740 superalloy was modified by changes in the Al/Ti ratio (0.7, 1.5, 3.4) and addition Ta (2.0, 3.0, 4.0%). Remelted (A0) nine variants with various compositions were fabricated lost-wax casting. microstructure, microsegregation, phase transformation temperatures, thermal expansion coefficients hardness superalloys investigated scanning electron microscopy, energy dispersive X-ray spectroscopy, differential calorimetry, dilatometry Vickers...

Abstract The equiaxed Ni-based superalloy René 108 was subjected to short-term annealing at five temperatures between 900 °C and 1100 °C. phase composition, lattice parameters, microstructure, stereological chemical composition of γ′ precipitates were investigated by thermodynamic simulations, X-ray diffraction, scanning transmission electron microscopy, energy-dispersive spectroscopy. Analysis the γ parameters using Nelson-Riley extrapolation function showed that misfit parameter for 1050...

Eight investment castings of Inconel 713C superalloy were fabricated, varying in the melt-pouring temperature, from 1400 to 1520 °C, and CoAl2O4 inoculant content, 0 or 5 wt.%, primary coat. Their influence on grain size tensile creep properties was investigated. The best combination yield stress (815 MPa) elongation (A4 = 7.65%) at ambient temperature obtained surface-modified poured °C. longest time rupture for unmodified (76.8 h) while modified variant, lower around, 7.4 h, which still a...

The aim of this study is to investigate influence selected parameters gas tungsten arc welding on microstructure MAR-M247 nickel based superalloy originating from turbine vane.MAR-M247 a precipitation-strengthened which widely used in aerospace engines.The main strengthening phase material ordered L1 2 intermetallic γ' Ni 3 (Al, Ti).The surface alloy was modified by electric order present microstructural changes weld and heat affected zone.Investigation the zone revealed that constitutional...

Abstract The change of γ′ phase morphology in quenched Ni-based superalloy strengthened by precipitates was investigated means scanning electron microscopy and X-ray diffraction. Lattice parameters γ phases subsequently the δ parameter were calculated. Relatively high content gamma prime formers resulted a substantially volume fraction dendrite cores. significantly decreased due to dissolution surrounding matrix, as result short-term subsolidus exposure. lattice higher than that phase, which...

Abstract The presented research investigates MAR-M247 ® Ni-based superalloy castings produced via directional solidification at various mold preheating temperatures (1510, 1566 °C) and withdrawal rates (3.4, 5.0 mm/min). Casting analyses were carried out thermodynamic simulations, differential scanning calorimetry (DSC), X-ray diffraction (XRD), light microscopy (LM), electron (SEM), energy dispersive spectroscopy (EDX), transmission (STEM), tensile testing. On DSC curve, four effects have...

Abstract This work presents the influence of high-frequency induction preheating (900, 1000, 1100 °C) on liquation crack formation in René 108 Ni-based superalloy. The investigation was divided into two parts: (1) characterization material's microstructure after and (2) determining cracking during autogenous gas tungsten arc welding. During preheating, dissolution γ′ precipitates showed accelerated progress with increase temperatures. involved continuous thinning each precipitate, as well...

In the investment casting process, building of ceramic layers around wax pattern is main time-consuming stage. Increasing their number ensures sufficient mechanical properties, but also lengthens whole including drying time and preheating mold. Four molds for Ni-based superalloy IN713C were strengthened by glass fibers, included in slurry, metal powder, Al, Cu, Fe or Ni, coverage. Castings subjected to microstructural investigations order find out if new design can be promising manufacture...

The effect of cobalt aluminate inoculant addition and melt-pouring temperature on the structure mechanical properties Ni-based superalloy was studied.The first major move to control quality investment cast blades vanes grain size.Cobalt (CoAl 2 O 4 ) is most frequently utilized in lost-wax casting process superalloys.The prime coat moulds pouring play a significant role size control.The finest surface grains were obtained when internal shell mould coated with subsequently at 1480°C.The...

Abstract Quaternary powder mixtures y Ni–20Cr–1.5Al– x TiC p ( = 78.5, 73.5, 68.5; 0, 5, 10) were deposited on ferritic 10CrMo9–10 steel to form plates ex-situ composite coatings with austenitic-based matrix. Plasma deposition was carried out various parameters obtain eight variants. The microstructure, chemical composition, phase constitution, transformation temperatures, and microhardness of the two reference -free six composites investigated by X-ray diffraction, scanning transmission...

Abstract The paper presents the some aspects of optimization filler metals consumption in production welded steel structures. Correct choice beveling method can allow to decrease cost and increase quality. review calculation methods metal at design stage was carried out. Moreover, practical examples amount were presented analyzed. article also contain mobile apps which are makes it easy see welding costs just a few seconds. Apps as well simple excel spreadsheets with correct mathematic...

W artykule przedstawiono próbę implantacyjną oceny skłonności do pęknięć zimnych złączy spawanych. Przedstawiono również wyniki próby dla stali 7CrMoVTiB10-10 oraz badania w zakresie charakteru przełomu. Evaluation of susceptibility to cold cracking welded joints in the implant test AbstractThe paper presents method as useful for evaluation joints. Moreover, there are presented results 7CrMoTiVB10-10 steel and fractures analyses with use light microscopy scanning electron microscopy.

The as-cast microstructure, alloying element segregation, solidification behavior, and thermal stability of model superalloys based on Inconel 740 with various Al/Ti ratios (0.7, 1.5, 3.4) Ta (2.0, 3.0, 4.0 wt%) concentrations were investigated via ThermoCalc simulations, scanning transmission electron microscopy, energy-dispersive X-ray spectroscopy, dilatometry, differential calorimetry. the began formation primary γ dendrites, followed by MC carbides. type subsequently formed phases...

Abstract The work focuses on characterizing the microstructure and selected properties of Al- (1.3 or 2.8 wt pct) Ta-modified (2 3 4 Alloy 740 Ni-based superalloy after heat treatment. observations analyses were conducted using thermodynamic simulations, X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, transmission steam oxidation, hardness, tensile, stress rupture tests. castings exhibit a typical dendritic structure, with presence fine γ ′ precipitates,...

The results of tribological tests carried out on two novel high-entropy alloys (HEAs) from the AlCoCuFeNi group are described in this study. Research was using a Miller machine (ASTM G75 standard) an abrasive slurry environment, which contained SiC and water 1:1 ratio. obtained showed higher rate wear material designated as D3 (total weight loss D3-1.6g compared to 1.1g D5 alloy), characterised by homogeneous microstructure hardness 186 HV5. second dual phase alloy, D5, lower wear. In...

Alloy 625 is a Ni-based superalloy with the main alloying elements being Nb, Cr, and Mo. It known for its excellent corrosion resistance, good weldability, both high heat creep strength. The current work presents microstructure of 625-nTiC metal matrix composites (MMC) fabricated through suction casting. chemical composition strengthening phases were investigated by light microscopy, scanning electron microscopy energy-dispersive X-ray spectroscopy. results showed that MMC are characterized...

Abstract This work focuses on MAR-M247 Ni-based superalloy manufactured via directional solidification at various withdrawal rates (3.4 or 5.0 mm/min) and shell mold temperatures (1510 °C 1566 °C) after solution heat-treatment (SHT). Observations analyses of four casting variants were carried out using thermodynamic simulations, differential scanning calorimetry (DSC), X-ray diffraction (XRD), light microscopy (LM), electron (SEM), spectroscopy (EDX), tensile tests ambient temperature. The...