Effects of melt treatment on the cast structure of M963 superalloy

Yin, Fengshi

doi:10.1016/s1359-6462(02)00446-3

Cited by 64 publications

(28 citation statements)

References 3 publications

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“…Particularly, some macro-segregations defects such as freckles and white spots formed during the solidification process will lead to entire failure for the whole ingot. It has been founded for a lot of steels and alloys that the melting temperature represents melt superheat, which has a great effect on liquid structure, as-cast microstructure and combination of properties of the alloy [5][6][7][8][9][10][11][12]. So, the information about structural transformation in a liquid state during heating has a great importance for the elaboration of melting processes [13].…”

Section: Introductionmentioning

confidence: 99%

The Influence on Niobium and Titanium on Electrical Resistivity in Liquid State and Solydification of In718 Alloy

Tyagunov

Baryshev

et al. 2017

Acta Metall Slovaca

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The electrical resistivity of IN 718 alloy was studied in a liquid state with contactless induction method of rotating magnetic field. Solidification process was studied by differential thermal analysis. It was founded that electrical resistivity varies in a complicated way with increasing temperature. It is shown that heating of the liquid metal above certain temperatures causes of hysteresis, i.e. discrepancy between the temperature dependences of heating and cooling. It was revealed, that the changes of niobium contents within alloy composition do not lead to a qualitative change of temperature dependence type, but accompanied by some peculiarities. Effect of titanium content on electrical resistivity changes within the alloy composition does not clearly detect. The temperature of maximal melt heating determines the degree of supercooling of liquid alloy. Keywords: Electrical resistivity, differential thermal analysis, nickel based alloy IN 718, liquidstate, temperature dependence, niobium and titanium influence IntroductionThe precipitation-hardening iron-nickel based alloy IN 718 is widely used in manufacture of hightemperature components in the gas turbine industry, power plant and petrochemical plants [1,2]. It is a superalloy, having a compensation of high strength at moderate temperatures, corrosion and oxidation resistance. Because of its excellent balance of properties and reasonable cost, IN718 is accounting for more than 50% of commercial superalloy productions in the world [1]. With the development of land-based power generation and aircraft propulsion, scaling-up of components has become the necessity. The size of IN 718 ingot produced by VIM-ESR-VAR triple melting has increased dramatically over the past 10 years in response to market demands [2][3][4]. However, the solute segregation problem, mainly niobium segregation, is a big obstacle for producing large size IN 718 ingots. Particularly, some macro-segregations defects such as freckles and white spots formed during the solidification process will lead to entire failure for the whole ingot. It has been founded for a lot of steels and alloys that the melting temperature represents melt superheat, which has a great effect on liquid structure, as-cast microstructure and combination of properties of the alloy [5][6][7][8][9][10][11][12]. So, the information about structural transformation in a liquid state during heating has a great importance for the elaboration of melting processes [13]. One of the methods of study of structural transformation in the liquid metal is measuring of temperature dependences of structure-sensitive properties of melt, such as electrical resistivity, kinematic viscosity, density, surface tension and others. Previously it has been founded by the [13] that the

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Section: Introductionmentioning

confidence: 99%

The Influence on Niobium and Titanium on Electrical Resistivity in Liquid State and Solydification of In718 Alloy

Tyagunov

Baryshev

et al. 2017

Acta Metall Slovaca

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“…It is widely believed that a liquid state has a great effect on the microstructures and properties of as-cast materials. Melt thermal treatment and melt superheating treatment have been widely explored and used in modifying the solidification microstructure and improving the mechanical or physical properties of various materials: metallic alloys [1][2][3], aerogel [4], and polyethylene [5]. But the exact mechanism is still not fully understood, and there are discrepancies in the explanations put forward [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of liquid-liquid transition on solidification and wettability of Sn-0.7Cu-xBi solder

Li¹,

Zhao²,

Zhang³

et al. 2016

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The electrical resistivity-temperature curve (ρ-T ) of Sn-0.7Cu-xBi (wt.%) melts was measured, and anomalous changes were observed on the ρ-T curve at the temperature far above the corresponding liquidus. The results reveal that the melts have experienced a temperatureinduced liquid-liquid transition (LLT), and the transition is reversible after the first cycle heating. Based on the result of LLT, solidification experiments and spreadability testing were carried out on the Sn-0.7Cu-xBi alloy to investigate the effect of LLT on the solidification and wettability. The results show that the microstructure was refined, and the wettability was improved when the solder samples solidified from the melt experienced LLT.K e y w o r d s : Sn-0.7Cu-xBi solders, liquid-liquid transition, solidification, wettability

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“…They can be controlled by optimizing the process variables such as casting parameters, including the mold preheating temperature and pouring temperature of the melt [4][5][6], as well as melt treatment parameters including the melt superheating temperature and the holding time [7][8][9]. Melt treatment has been widely used in a series of alloys [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Liu et al [7] have reported that the variation of melt superheating temperature (above the liquidus and below 1823 K) has a significant effect on the cast microstructure of the IN738LC superalloy, and a low melt superheating temperature causes a significant reduction in the grain size. Yin et al [8] have reported that a melt superheating temperature of 2123 K causes a significant reduction of grain and carbide sizes compared with the melt superheating temperature of 2023 K. However, there is still no report about the effect of melt superheating temperature from 2023 to 2123 K on the cast structure of the superalloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of melt superheating treatment on the cast structure of K465 nickel-based superalloy

et al. 2009

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The cast structure of a K465 nickel-based superalloy with different temperatures of melt superheating treatment was studied. It is shown that melt superheating treatment plays a significant role in the grain size and carbide morphology. With increasing melt superheating temperature (below 2023 K), the grain size increases obviously and the carbide morphology is changed from a blocky to a script-like shape. However, when the melt superheating temperature is between 2023 K and 2123 K, the grain size decreases gradually, and the morphology of the MC carbide changes back to the blocky appearance. The content of W is also influenced by melt superheating treatment.

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Effects of melt treatment on the cast structure of M963 superalloy

Cited by 64 publications

References 3 publications

The Influence on Niobium and Titanium on Electrical Resistivity in Liquid State and Solydification of In718 Alloy

The Influence on Niobium and Titanium on Electrical Resistivity in Liquid State and Solydification of In718 Alloy

Effect of liquid-liquid transition on solidification and wettability of Sn-0.7Cu-xBi solder

Effect of melt superheating treatment on the cast structure of K465 nickel-based superalloy

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