Effect of Processing and Composition on the Structure and Properties of P/M EP741NP Type Alloys

Radavich, J.F.; Carneiro, Tadeu; Furrer, David; Lemsky, Joseph; Banik, A.

doi:10.1016/s1000-9361(07)60013-2

Cited by 16 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the ratios 30% and 40% the intensity of peaks of Au becomes to increases and the peak's intensity of WO 3 gradually began to decrease ,all the samples have a hexagonal structure for WO 3 according to International Centre for Diffraction (card No.96-100-4058) ,and which is doped gold nanoparticles have a cubic structure according to the International Centre for Diffraction (96-901-2431) (see Table 1), in the randomly there are defects and levels of the tail and at annealing are improving the composition of the material and rearrangement, which led to conversion to multible crystallization its' mean removing some defects and gaps remained local levels and therefore the gap is less more than before. The crystallite size decreases by increasing the deflection, this is explained by the large diameter of the ion of the defect will be interface, which leads to the decrease in crystallite size and thus an increase of (2θ), the crystallite size is inversely propotional to the (FWHM) this is agree with [10][11][12][13], the average crystallite size was equal to (9.24)nm it was estimated with Debyescherrer formula for the (200) reflection follow [14]:…”

Section: -Results and Discussionsupporting

confidence: 58%

The effect of gold Nanoparticles on Structural and Electrical properties of WO3 thin films

Abdul-Jabbar¹,

Ibrahim²,

Fezaa³

2023

Tikrit J. Pure Sci.

View full text Add to dashboard Cite

Chemical spray pyrolysis technique was used at temperature 250˚C with annealing temperature at 400C˚( for 1hour) to deposition tungsten oxide thin film with different doping concentration of Au nanoparticle (0, 10, 20, 30 and 40) wt.% on glass substrate with thickness about 100 nm. The structural and electrical properties were investigated. The structure properties shows that the films at substrate by x-ray diffraction (XRD) temperature (250˚C) was amorphous structure while at annealing temperature have a polycrystalline structure with the preferred orientation of (200) , all the samples have a hexagonal structure for WO3 and Au gold nanoparticles have a cubic structure .The mechanisms of dc-conductivity of un-doped WO3 and doped with Au (10,20,30 and 40) wt.% thin films at the range (303 to 473) K have been discussed , there is decrease in conductivity with the increase in the doping concentration and hall measurements show that all films have a negative hall coefficient and nH increases with the increase of Au dopant ratio and decreasing in carrier mobility (μH) with increasing of Au .

show abstract

Section: -Results and Discussionsupporting

confidence: 58%

The effect of gold Nanoparticles on Structural and Electrical properties of WO3 thin films

Abdul-Jabbar¹,

Ibrahim²,

Fezaa³

2023

Tikrit J. Pure Sci.

View full text Add to dashboard Cite

show abstract

“…In addition, numerous oxides and nitrides were identified in the areas of the primary grain boundaries of the solid γ solution, weakening the cohesion and strength of the boundaries (Figure 15b). limiting the growth of other M23C6 and MC carbides within the grain boundaries and thus improving the resistance to high-temperature creep [20,21]. However, according to the results presented in [22], failure to maintain the technological process regime at the alloy production stage may lead to the formation of hafnium oxide (HfO2) precipitates with a monoclinic structure, significantly contributing to the development of fatigue cracks, which was also confirmed in the case of the examined disc material.…”

Section: Elementsupporting

confidence: 60%

“…According to literature reports, this element was added to the EP741NP alloy to form hafnium carbides, When analysing the observations of the tested alloy microstructure, it is impossible to ignore the identified hafnium oxide precipitates (Figures 9 and 10). According to literature reports, this element was added to the EP741NP alloy to form hafnium carbides, limiting the growth of other M 23 C 6 and MC carbides within the grain boundaries and thus improving the resistance to high-temperature creep [20,21]. However, according to the results presented in [22], failure to maintain the technological process regime at the alloy production stage may lead to the formation of hafnium oxide (HfO 2 ) precipitates with a monoclinic structure, significantly contributing to the development of fatigue cracks, which was also confirmed in the case of the examined disc material.…”

Section: Elementmentioning

confidence: 99%

Operational and Material Causes of High-Pressure Turbine Disc Damage in the RD-33 Engine

Jóźwiak,

Kozakiewicz,

Kachel

et al. 2023

Materials

View full text Add to dashboard Cite

This paper presents an analysis of the causes of damage and fragmentation to the high-pressure turbine (HTP) disc of the RD-33 engine mounted in the MIG-29 aircraft. The authors have carried out an analysis of the changes to the structure of the disc material, both in the areas containing cracks and in the undamaged areas. The impact of structural changes on the alterations in the analysed strength properties along the disc radius was assessed. Material tests were correlated with the analysis of the recorded engine parameters, indicating potential causes of the HPT disc fragmentation.

show abstract

“…[12,179] Highperformance gas turbine engines require PM superalloys, such as EP741NP developed in Russia, with low C contents and additional carbide or oxide formers instead. [180][181][182] Table 1, Table 3, and Table 5 highlight the unique properties of B, C, and Zr in GB segregation and precipitation. However, information on the combined impact of microalloying elements on the mechanical properties of Ni-based superalloys is more sparse.…”

Section: Solid-state Microsegregationmentioning

confidence: 99%

“…[ 12,179 ] High‐performance gas turbine engines require PM superalloys, such as EP741NP developed in Russia, with low C contents and additional carbide or oxide formers instead. [ 180–182 ]…”

Section: Combined Impacts Of Boron Carbon and Zirconiummentioning

confidence: 99%

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

et al. 2022

View full text Add to dashboard Cite

Cast and wrought Ni‐based superalloys are materials of choice for harsh high‐temperature environments of aircraft engines and gas turbines. Their compositional complexity requires sophisticated thermo‐mechanical processing. A typical microstructure consists of a polycrystalline γ‐matrix, strengthening Ni3(Al,Ti) γ′ precipitates, carbides (MC, M6C, and M23C6), borides (M2B, M3B2, and M5B3), and other inclusions. Microalloying additions of B, C, and Zr commonly improve high‐temperature strength and creep resistance, although excessive additions are detrimental. Grain boundary (GB) segregation may improve cohesion and displace embrittling impurities. Finely dispersed carbides and borides are desired to control grain size via GB pinning. However, excessive decoration of GBs may lead to failure during processing and in‐service. Hence, a systematic review on the roles of B, C, and Zr in cast and wrought Ni‐based superalloys is required. The current state of knowledge on GB segregation and precipitation is reviewed. Experimental and modeling results are compared across various processing steps. The impact of GB precipitation on mechanical properties is most well researched. Co‐precipitation in proximity to GBs interacting with local microstructure evolution and mechanical properties remains less explored. Addressing these gaps in knowledge allows a more complete understanding of processing–microstructure–properties relationships in advanced cast and wrought Ni‐based superalloys.

show abstract

Effect of Processing and Composition on the Structure and Properties of P/M EP741NP Type Alloys

Cited by 16 publications

References 3 publications

The effect of gold Nanoparticles on Structural and Electrical properties of WO3 thin films

The effect of gold Nanoparticles on Structural and Electrical properties of WO3 thin films

Operational and Material Causes of High-Pressure Turbine Disc Damage in the RD-33 Engine

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

Contact Info

Product

Resources

About