“…It is evident that the nitrides precipitate as nucleating agent in liquid alloy. Compared with previous investigations, 1,2,10,14 the results of this work eliminate the effect of nitrides by addition. 4Equiaxed grains in CNS samples a 5 ppm N; b 17 ppm N; c 26 ppm N; d 34 ppm N…”
Section: Resultsmentioning
confidence: 50%
“…These results are in good agreement with those previously proposed. 2,10,13 Moreover, some big black nitrides precipitate in alloy with 34 ppm nitrogen.…”
Section: Resultsmentioning
confidence: 99%
“…5,6 It is found that the fatigues of nickel-base superalloys originate from the cracking of the brittle inclusions and matrix. [7][8][9][10] In view of the substantial economic benefit of recycling revert nickel-base superalloys, it is necessary to investigate the effect of nitrogen content on the microstructure and properties of nickel-base superalloys.…”
Section: Introductionmentioning
confidence: 99%
“…Painter and Young 14 found that microporosity increased with the increase of CrN, but decreased when the amount of TiN was increased. Having worked on the effect of nitrogen admixtures on the low-cycle fatigue of the alloy ZhS30-VI single crystals, Kablov et al 9,10 suggested that the low-circle fatigue was decreased significantly when the nitrogen content increased from 5 to 20 ppm. Although the effect of nitrogen was investigated by adding nitrides, whether the nitrides decomposed or not in the molten nickel-base superalloy is not clear.…”
The effects of nitrogen content on the microstructure and the mechanical properties of a cast nickel-base superalloy (CNS) have been investigated experimentally. Experimental results demonstrated that the grain structure of CNS samples was refined by increasing the nitrogen content, but the area percentage of microporosity has been augmented with increased nitrogen content. Increasing the nitrogen content resulted in the morphology evolution of carbide from an acicular or 'Chinese hieroglyphs' type to blocky one, while negligible change of the morphology of γ ′ precipitates was observed. Finally, it was found that the tensile strength has no obvious variation as the nitrogen content increases from 5 to 26 ppm, but it reduces sharply when the nitrogen content is raised to 34 ppm. The elongation decreases gradually with increasing nitrogen content.
“…It is evident that the nitrides precipitate as nucleating agent in liquid alloy. Compared with previous investigations, 1,2,10,14 the results of this work eliminate the effect of nitrides by addition. 4Equiaxed grains in CNS samples a 5 ppm N; b 17 ppm N; c 26 ppm N; d 34 ppm N…”
Section: Resultsmentioning
confidence: 50%
“…These results are in good agreement with those previously proposed. 2,10,13 Moreover, some big black nitrides precipitate in alloy with 34 ppm nitrogen.…”
Section: Resultsmentioning
confidence: 99%
“…5,6 It is found that the fatigues of nickel-base superalloys originate from the cracking of the brittle inclusions and matrix. [7][8][9][10] In view of the substantial economic benefit of recycling revert nickel-base superalloys, it is necessary to investigate the effect of nitrogen content on the microstructure and properties of nickel-base superalloys.…”
Section: Introductionmentioning
confidence: 99%
“…Painter and Young 14 found that microporosity increased with the increase of CrN, but decreased when the amount of TiN was increased. Having worked on the effect of nitrogen admixtures on the low-cycle fatigue of the alloy ZhS30-VI single crystals, Kablov et al 9,10 suggested that the low-circle fatigue was decreased significantly when the nitrogen content increased from 5 to 20 ppm. Although the effect of nitrogen was investigated by adding nitrides, whether the nitrides decomposed or not in the molten nickel-base superalloy is not clear.…”
The effects of nitrogen content on the microstructure and the mechanical properties of a cast nickel-base superalloy (CNS) have been investigated experimentally. Experimental results demonstrated that the grain structure of CNS samples was refined by increasing the nitrogen content, but the area percentage of microporosity has been augmented with increased nitrogen content. Increasing the nitrogen content resulted in the morphology evolution of carbide from an acicular or 'Chinese hieroglyphs' type to blocky one, while negligible change of the morphology of γ ′ precipitates was observed. Finally, it was found that the tensile strength has no obvious variation as the nitrogen content increases from 5 to 26 ppm, but it reduces sharply when the nitrogen content is raised to 34 ppm. The elongation decreases gradually with increasing nitrogen content.
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