Effects of grain refinement on cast structure and tensile properties of superalloy K4169 at high pouring temperature

Jie, Ziqi; Zhang, Jun; Huang, Taiwen; Liu, Lin; Su, Haijun; Shi, Yu; Fu, Hengzhi

doi:10.1007/s41230-016-5124-9

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…The long coarse columnar dendrites seen in the CC and MTCS process provide a few but larger and continuous interdendritic regions with higher Nb concentration, resulting in the formation of coarser and long chains of interconnected Laves particles. In contrast, the finer and equiaxed dendritic structure observed in the two cast conditions presents more but smaller and well‐separated interdendritic regions with comparatively lower Nb concentration, leading to the formation of relatively finer and discrete laves particles …”

Section: Resultsmentioning

confidence: 82%

Enhanced Grain Refinement and Porosity Control of the Polycrystalline Superalloy by a Modified Thermally Controlled Solidification

et al. 2016

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An integrated technique, combining the modified thermally controlled solidification (MTCS) process with the mixed refiner of Co 3 FeNb 2 and CrFeNb ternary intermetallic compounds, has been designed to enhance grain refinement and restrain porosity in polycrystalline IN718 C superalloy. The refinement efficiency of integrated technique is quite superior to that by convention casting (CC) process with refiner, as experiment results show that the grain size is refined from 3 340 to 126 mm and, during the refinement process, the microstructure of IN718 C superalloy evolves from dendrite to granular structure. Meanwhile, comparing with the CC process, this integrated technique has significantly eliminated porosities and dramatically improved the mechanical properties.

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Section: Resultsmentioning

confidence: 82%

Enhanced Grain Refinement and Porosity Control of the Polycrystalline Superalloy by a Modified Thermally Controlled Solidification

et al. 2016

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“…Advances in Materials Science and Engineering [13,25,39,59,69] Microstructure: any study that talked in depth about the microstructure of the alloys used and its effect on alloy properties and quality [7, 9-12, 15, 16, 18, 20, 22, 23, 29, 31, 32, 34, 35, 39, 46, 52, 54, 55, 57, 59, 67, 68, 72, 74, 76, 77, 79-84] Fracture mode: any study that talks about the fracture mechanisms, modes, and crack propagation taking place in superalloys [3, 10, 11, 13, 19, 20, 22, 30, 31, 37, 41, 43, 47, 53-55, 58, 59, 67, 77, 85] Ductility [37] Grain or dendrite size: any study that talks in depth about the grain or dendrite size, PDAS value, SDAS value, carbide size, or other precipitate sizes [11, 12, 16, 22, 34-36, 59, 66, 79, 80, 82, 86] Grain refinement: any study that talks about grain refinement, the process of refinement, and how and why the refinement takes place [16,17,34,48,49,80,87,88] Additive manufacturing: any study in which AM process was used [10] Hot isostatic pressing: any study in which the HIP process was used [3,14,58,67,89] Vacuum condition: any study that talked in depth about the effects of using vacuum conditions during casting procedure [26] Effect of alloying elements: any study that talks about the effects of different alloying elements and how varying their contents can affect the final product [7,40,42,55,59,73,76,77,82,83,90] Advances in Materials Science and Engineering…”

Section: Research Areamentioning

confidence: 99%

“…is was proved by the increase in alloy strength and tensile properties, with the increase in aging time, and reaching peak performance after aging of 20 h, followed by severe deterioration of tensile properties with aging beyond 20 h. Another study [88] investigated the effect the grain refinement had on the structure of cast and other properties brought about by the addition of two intermetallic compounds CO3FeNb2 and CrFeNb to the K4169 alloy as refiners. Without grain refinement, only columnar grains were observed.…”

Section: Physical and Mechanical Properties And Behaviour Of Ni-based Superalloysmentioning

confidence: 99%

“…us, many studies have been done to investigate how freckling occurs and how it can be handled. Studies regarding freckling [85][86][87][88][89][90][91][92] showed that freckles were formed as a result of interdendritic microsegregation caused by thermosolutal convection, which in turn is mainly caused by density inversion taking place in the mushy zone. Preferential formation of freckles was seen when the thermal gradient and solidification rate during casting were low.…”

Section: Freckle Defect Inmentioning

confidence: 99%

“…e PDAS and SDAS values were seen to decrease as the rate of withdrawal increased, and this was seen to cause a reduction in the number of freckles formed. Studies [5,[85][86][87][88][89][90][91][92] also showed that freckles only formed on internal or external surfaces, as thermosolutal fluid flow/convection and channel segregation were only seen to develop a stable flow at casting surfaces and not in the bulk of the material. Some studies [26,85] also revealed that convex edges are preferred locations for freckling to occur.…”

Section: Freckle Defect Inmentioning

confidence: 99%

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Recent Advancements in the Field of Ni‐Based Superalloys

Selvaraj

Sundaramali

Dev

et al. 2021

Advances in Materials Science and Engineering

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In this review article, research papers related to recent developments in Ni-superalloy technologies have been reviewed in order to provide an insight into recent achievements and the potential for further study, research, and development in this field. In this paper, studies on various aspects of Ni-based superalloys are reviewed, such as production methods, which include widely used casting methods, as well as unconventional alternative procedures, novel techniques, or simulation and prediction of certain alloy casting properties. Reviewing was done by categorising the papers into 4 major categories: manufacturing of Ni-based superalloys, effects of alloying elements, physical and mechanical properties of Ni-based superalloys, and defects in Ni-based superalloys. The process used to make Ni-superalloy parts can have a huge impact on the production process efficiency, the final product’s quality and properties, and the defects formed in it. Investment casting is one of the most common methods for making Ni-superalloy parts. Manufacturing covers studies on various casting methods used to make Ni-based superalloy components, novel techniques and methods developed to improve casting procedures to produce better products, and alternative manufacturing methods like AM and HIP processing. Similar to production process, the role of alloying elements is also very important. Even minor changes in their compositions can cause significant changes in the final product. Simultaneously, these alloying elements appear to be more efficient in the development of new methods to control product quality, suppress defect formation, and improve material properties such as the creep and fatigue. As a result, the effects of various alloying elements used in castings of Ni-based superalloys are thoroughly examined. A material’s properties are its most important components. They assist the industrialist in selecting or developing a material based on the needs of the application/use. With this in mind, many researchers have conducted extensive research on physical and mechanical properties, as well as how to improve them. Fatigue life, stress rupture, creep properties, impact ductility, strain response, stress relaxation behaviour, and so on are some of the most important physical and mechanical properties of Ni-superalloys. This article thoroughly reviews various studies on these properties, how and by what factors they are affected, and how they can be improved. Another important factor to consider when making Ni-superalloy castings is defect formation, which can affect the properties of the final product. Freckle defects, hot tears, porosities, and slivers are some of the major defects that occur in Ni-superalloys during the casting process. This article also reviews in detail about these defects, how they form, and how they affect the final product. These defects were found to have a significant influence on a variety of properties, such as creep, fatigue behaviour, and fracture mechanism. Topics and areas such as reinforcement of Ni-superalloys with the help of CNCs and 3D printing of Ni-superalloys that can provide scope for potential future research are highlighted based on the above-reviewed papers.

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Effect of magnetic‐thermal coordinated control solidification on grains and porosities of a superalloy K4169

Zhu,

Zhang,

et al. 2024

Materialwissenschaft Werkst

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Since the solidification structure of metals cast by conventional mold casting often has porosity defect, the combination of low voltage pulsed magnetic field and thermally controlled solidification was used to solve this defect. The combination method is called magnetic‐thermal coordinated control solidification. Pulsed magnetic field stirring can refine equiaxed grains, and the thermally controlled solidification method can eliminate the concentrated shrinkage cavity and reduce the dispersed shrinkage porosity. Thus, a superalloy K4169 with fine equiaxed grains, low content of dispersed shrinkage porosity and without concentrated shrinkage cavity defect is fabricated by magnetic‐thermal coordinated control solidification.

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Effects of grain refinement on cast structure and tensile properties of superalloy K4169 at high pouring temperature

Cited by 8 publications

References 14 publications

Enhanced Grain Refinement and Porosity Control of the Polycrystalline Superalloy by a Modified Thermally Controlled Solidification

Enhanced Grain Refinement and Porosity Control of the Polycrystalline Superalloy by a Modified Thermally Controlled Solidification

Recent Advancements in the Field of Ni‐Based Superalloys

Effect of magnetic‐thermal coordinated control solidification on grains and porosities of a superalloy K4169

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