Microcast-X Fine Grain Casting: A Progress Report

Brinegar, J.R.; Norris, L. F.; Rozenberg, L. D.

doi:10.7449/1984/superalloys_1984_23_32

Cited by 17 publications

(4 citation statements)

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“…In the early 1980's, the first generation of fine-grain casting technique, named Grainex was developed by Howmet Turbine Component Corporation [5,6]. In this process, castings are agitated during solidification to shear dendrites and initiate multiple nucleation sites, which subsequently leads to an uniform refined grain size, ranging from ASTM M9-M 13 (1.6-0.4 mm), close to ASTM 0 (0.36 mm ).…”

Section: Grain Refinement Methods and Their Application To Superalloysmentioning

confidence: 99%

Cast Structure and Mechanical Properties of Fine Grained Superalloy K4169 by Addition of Refiners

Liu¹,

Huang²,

Xiong³

et al. 2004

Superalloys 2004 (Tenth International Symposium)

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Grain size and microstructural features of cast superalloy K4169 were investigated under various melting and casting conditions together with the addition of grain refiners. It is found that lowering the pouring temperature and adding refiners to the melt before pouring can lead to grain refinement of matrix and improve the proportion of equiaxed grains. At a conventional pouring temperature of 1400 , the average size of equiaxed grains could be refined to the order of ASTM 3.2 (0.17 mm), the proportion of equiaxed grains at the transverse cross-section could be improved from 56% to 99% with addition of a trace intermetallic compound into the melt. The results also indicate that the length of primary dendrite is shortened with the addition of refiners, but the secondary dendrite arm spacing keeps almost unchanged. Meanwhile, the microsegregation of main elements such as Fe, Cr, Nb, Mo and Ti is alleviated with the decrease in grain size, and the grains have transformed from dendrite to granulation in fine-grained castings. The amount of microporosity in samples with the addition of refiners can be greatly reduced. The mechanisms of grain refinement and increase in equiaxed grain proportion were proposed.Tensile properties at room temperature and at 700 were tested. The rupture strength, yield strength, elongation and reduction of area for refined grains are all more superior to those of coarse ones. Whereas the elongation and reduction of area of fine grained samples decrease at 700 . Low cycle fatigue (LCF) properties of refined grain samples at room temperature are improved significantly. In addition, the degree of dispersion of LCF data of fined grain samples is diminished.

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Section: Grain Refinement Methods and Their Application To Superalloysmentioning

confidence: 99%

Cast Structure and Mechanical Properties of Fine Grained Superalloy K4169 by Addition of Refiners

Liu¹,

Huang²,

Xiong³

et al. 2004

Superalloys 2004 (Tenth International Symposium)

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“…Since 1980, first generation integral fine grain process (GX ® ) and second generation integral fine grain process (MX ® ) have been successively developed by Howmet Corporation. The grain size could be refined from ASTM M6 (4 mm) to ASTM 2~ M8.5 (0.18 mm~1.89 mm) by GX ® , and even to ASTM 3~ 5 (0.065 mm~0.125 mm) by MX ® [3][4] . Bouse et al [5][6] used MX ® to prepare IN718C alloy and improved its ultimate tensile strength and fatigue life significantly.…”

Section: Introductionmentioning

confidence: 99%

Effect of micro-grain casting process on the microstructure and high cycle fatigue properties of K492M alloy at 700 °C

Hu,

Wang,

et al. 2024

J. Phys.: Conf. Ser.

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A nickel base polycrystalline superalloy K492M was used as the material in the present study. The samples of K492M alloy were prepared by conventional casting process, fine-grain casting process and micro-grain casting process, respectively, to study the effects of micro-grain casting process on the microstructure and high cycle fatigue property of K492M alloy at 700 °C. The experimental results show that micro-grain casting process can significantly refine grains, reduce solidification segregation and increase γ′ volume fraction. The micro-grain casting K492M sample exhibited a significantly higher high cycle fatigue life at 700 °C, which was improved by 412% and 269% from that of conventional and fine-grain casting samples, respectively. Analysis for fracture sample indicated that fatigue cracks initiated from the persistent slip bands on the surface or subsurface of the sample. In addition, the cracked carbides accelerated the crack propagation and fatigue fracture. The refined grains and carbides by micro-grain casting process significantly slowed down the propagation of fatigue cracks, and thereby improves the fatigue life.

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“…It follows that grain refinement necessitates both ease of nucleation and inhibition of the continued growth of crystallites in the melts. Fine grain casting techniques of superalloys mainly include the thermal control method [2], the chemical approach [1,3] and the dynamic method [4,5]. Among of these, the chemical fine grain process is an efficient method, which neither needs complicated equipment nor has a complex process.…”

Section: Introductionmentioning

confidence: 99%

Effects of Refiners on Grain Structures of Superalloy IN 718 at High Pouring Temperature

Jie¹,

Fu²,

Zhang³

et al. 2014

8th International Symposium on Superalloy 718 and Derivatives (2014)

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In order to improve the filling ability of large complex thin wall castings, the pouring temperature should be increased, but this will result in grain size coarsening. Therefore, effects of refiners on grain structures of superalloy Inconel 718 have been investigated. It is shown that, adding mixed refiner consisting of two ternary intermetallic compounds at pouring temperature of 1520°C, the average equiaxed grain size could be refined from 10.56 to 2.71mm and the proportion of equiaxed grains at cross-section could be improved from 10 to 84%. At the same pouring temperature, the amount of porosity in specimens could be greatly decreased by adding refiners into the melt. Moreover, experimental results indicate that trace addition of refiners to the melt neither introduces inclusions nor changes the phase constituents of the alloy. Grain refinement mechanisms are also discussed.

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Microcast-X Fine Grain Casting: A Progress Report

Cited by 17 publications

References 0 publications

Cast Structure and Mechanical Properties of Fine Grained Superalloy K4169 by Addition of Refiners

Cast Structure and Mechanical Properties of Fine Grained Superalloy K4169 by Addition of Refiners

Effect of micro-grain casting process on the microstructure and high cycle fatigue properties of K492M alloy at 700 °C

Effects of Refiners on Grain Structures of Superalloy IN 718 at High Pouring Temperature

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