Grain refinement of superalloy K4169 by addition of refiners: cast structure and refinement mechanisms

Liu, Lin; Huang, Taiwen; Xiong, Yuhua; Yang, Aimin; Zhao, Zhongwei; Zhang, Rong; Li, Jinshan

doi:10.1016/j.msea.2004.10.005

Cited by 54 publications

(24 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Statistical analysis show that the temperature and complex modification technique should have strong influence on number of grains per mm 2 . Mean surface area of grains and shape index should be influenced only by modification technique and hardness is not dependant on any technological parameters.…”

Section: The Results Of Investigations and Discussion Of Resultsmentioning

confidence: 99%

“…on the other hand, have higher mechanical properties in lower temperatures and higher resistance to thermal fatigue and could be used in later stages of the turbine. There are many methods of influencing the grain size of nickel superalloys but the modification using nanoscale inoculants is especially strongly represented in recent Polish and international literature [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Modification and Casting Technology on Structure of IN-713C Superalloy Castings

Bińczyk

Cwajna

Gradoń

et al. 2016

Archives of Foundry Engineering

View full text Add to dashboard Cite

The paper presents the results concerning impact of modification (volume and surface techniques), pouring temperature and mould temperature on stereological parameters of macrostructure in IN713C castings made using post-production scrap. The ability to adjust the grain size is one of the main issues in the manufacturing of different nickel superalloy castings used in aircraft engines. By increasing the grain size one can increase the mechanical properties, like diffusion creep resistance, in higher temperatures. The fine grained castings. on the other hand, have higher mechanical properties in lower temperatures and higher resistance to thermal fatigue. The test moulds used in this study, supplied by Pratt and Whitney Rzeszow, are ordinarily used to cast the samples for tensile stress testing. Volume modification was carried out using the patented filter containing cobalt aluminate. The macrostructure was described using the number of grains per mm 2 , mean grain surface area and shape index. Obtained results show strong relationship between the modification technique, pouring temperature and grain size. There was no significant impact of mould temperature on macrostructure.

show abstract

Section: The Results Of Investigations and Discussion Of Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Modification and Casting Technology on Structure of IN-713C Superalloy Castings

Bińczyk

Cwajna

Gradoń

et al. 2016

Archives of Foundry Engineering

View full text Add to dashboard Cite

show abstract

“…Microcast-X, developed by Howmet Corporation, is a fine-grain technique with controlled low superheat and a high heat extraction rate. 5,17) The pouring and mold temperatures were 1380 C and 1100 C, respectively. Table 1 lists the nominal chemical composition of the resulting alloys.…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3] Current single crystal Ni-base superalloys are heavily alloyed with Re, resulting in increased strength and creep resistance, due to solid solution strengthening and the prevention of 0 coarsening during thermal exposure. [9][10][11][12][13][14] The incorporation of higher Re content is restricted by the formation of topological closed-packed (TCP) phases, such as , P, , and R. [15][16][17][18] Formation of a brittle TCP phase is often associated with the deterioration of tensile strength and creep damage. 19,20) To prevent the formation of a TCP phase, controlling the content of Re is an important consideration in the design of superalloys.…”

Section: Introductionmentioning

confidence: 99%

Influence of Rhenium on the Grain Boundary Strength, Phase Evolution, and High Temperature Mechanical Properties of a Fine-Grain Nickel-Base Superalloy at 982°C

et al. 2011

View full text Add to dashboard Cite

The influence of Re on the grain boundary (GB) strength, phase evolution, and 982 C mechanical properties of fine-grain Mar-M247 superalloy was investigated. Quantitative statistical analysis showed that an increase of Re content in Mar-M247 resulted in a decrease of the size, and an increase in the number of GB carbides. The results of tensile and 982 C/200 MPa creep tests showed that tensile properties and creep life both increase with an increase in Re up to a maximum at 3 mass%. The tensile and GB strength increased with increasing the number of fine GB carbides. The addition of 1$3 mass% Re reduced steady-state creep rates and postponed the onset of the acceleration stage in three ways: (1) by increasing the amount of primary cuboidal 0 phase; (2) by increasing the strength of matrix; and (3) by increasing the development of 0 raft. It also prolonged the duration of the accelerating creep stage by refinement and an increase in the number of GB carbides. The above mentioned factors resulted in a prolongation of creep life. It is noted that the GB carbide evolution and GB strengthening effect by addition of Re have not been reported in the nickel-base superalloy before. However, addition of greater amounts of Re, such as 5 mass% Re, causes deterioration of the tensile and creep properties due to the formation of P phases.

show abstract

“…That is why a knowledge about the growth of the initial dendritic microstructure during solidification based on experimental and theoretical studies is required to control the formation of solidification defects. Numerous studies of secondary dendrite arm spacing (SDAS) and dendrite growth in cast Ni-based superalloys have been carried out in order to optimize casting and microstructure parameters [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

The fixed-effects analysis of the relation between SDAS and carbides for the airfoil blade traces

Pietraszek¹,

Radek²

2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

The primary objective was to test a usefulness of the specific fixed-effect model for the analysis of quantitative relationships gathered from the image analysis of the material microstructures. The dataset was obtained from the investigation of turbine blades made from superalloy IN713C. The analysis based on the general linear model resulted in informative plots revealing mutual relationships between secondary dendrite arm spacing and the mean plane section area of carbides in the material. Directions for further research also were obtained.

show abstract

Grain refinement of superalloy K4169 by addition of refiners: cast structure and refinement mechanisms

Cited by 54 publications

References 6 publications

Influence of Modification and Casting Technology on Structure of IN-713C Superalloy Castings

Influence of Modification and Casting Technology on Structure of IN-713C Superalloy Castings

Influence of Rhenium on the Grain Boundary Strength, Phase Evolution, and High Temperature Mechanical Properties of a Fine-Grain Nickel-Base Superalloy at 982°C

The fixed-effects analysis of the relation between SDAS and carbides for the airfoil blade traces

Contact Info

Product

Resources

About

Grain refinement of superalloy K4169 by addition of refiners: cast structure and refinement mechanisms

Cited by 54 publications

References 6 publications

Influence of Modification and Casting Technology on Structure of IN-713C Superalloy Castings

Influence of Modification and Casting Technology on Structure of IN-713C Superalloy Castings

Influence of Rhenium on the Grain Boundary Strength, Phase Evolution, and High Temperature Mechanical Properties of a Fine-Grain Nickel-Base Superalloy at 982&deg;C

The fixed-effects analysis of the relation between SDAS and carbides for the airfoil blade traces

Contact Info

Product

Resources

About

Influence of Rhenium on the Grain Boundary Strength, Phase Evolution, and High Temperature Mechanical Properties of a Fine-Grain Nickel-Base Superalloy at 982°C