Effect of Cobalt Addition on the Deformation and Recrystallization Textures of Polycrystalline IN713C Nickel Based Superalloy

2014 ◽  
Vol 922 ◽  
pp. 711-715 ◽  
Author(s):  
J.Y. Song ◽  
Shigeo Sato ◽  
Yuichiro Koizumi ◽  
Akihiko Chiba
Keyword(s):  
Tensile Test ◽  
Room Temperature ◽  
Nucleation Site ◽  
Nickel Base Superalloy ◽  
Recrystallization Behavior ◽  
Nickel Based Superalloy ◽  
Nickel Base ◽  
Inconel 713C ◽  
Cobalt Addition ◽  
Room Temperature Tensile Test

The aim of this study was to examine the effect of cobalt addition on the deformation and recrystallization behavior. The prepared material was Inconel 713C nickel base superalloy. In order to improve the deformability, the IN713C was modified by cobalt addition with 5 and 10wt%. Mechanical property was determined by room temperature tensile test with the strain rate of 10-3s-1.The recrystallization was performed at 1473K for 300sec followed by oil quenching. The final microstructure becomes homogeneous through cobalt addition. Strength and work hardening rate were decreased during room temperature tensile test. By contrast, elongation was increased. Nucleation site was changed by cobalt addition. It was found that kinetics of recrystallization is dependent of the cobalt addition. The cobalt addition is attributed with ductility and recrystallization behavior and the latter is related to change of deformation behavior.

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Influence of an Aluminide Coating on the TMF Life of a Single Crystal Nickel-Base Superalloy

1998 ◽  
Author(s):  
Ernst E. Affeldt
Keyword(s):  
Single Crystal ◽  
Aluminide Coating ◽  
Turbine Blades ◽  
Temperature Cycling ◽  
Nickel Base Superalloy ◽  
Test Results ◽  
Bending Tests ◽  
Quantitative Correlation ◽  
Nickel Based Superalloy ◽  
Nickel Base

TMF tests were conducted with bare and aluminide coated single crystal nickel-based superalloy specimens. Temperature cycling was between 400°C and 1100°C with a phase shift (135°) which is typical for damaged locations on turbine blades. Stress response is characterized by a constant range and the formation of a tensile mean stress as a result of relaxation in the high temperature part of the cycle which is in compression. Bare specimens showed crack initiation from typical oxide hillocks. Coated specimens showed life reduction with respect to the bare ones caused by brittle cracking of the coating in the low temperature part of the cycle. Isothermal bending tests of coated specimens confirmed the low ductility of the coating at tempeatures below 600°C but quantitative correlation with the TMF test results failed.

Long-Term Gamma Prime Phase Stability after Various Heat Treatment Conditions with Temperature Dropping during Solution Treatment in Cast Nickel Base Superalloy, Grade Inconel-738

2017 ◽  
Vol 891 ◽  
pp. 420-425
Author(s):  
Sureerat Polsilapa ◽  
Aimamorn Promboopha ◽  
Panyawat Wangyao
Keyword(s):  
Heat Treatment ◽  
Turbine Blades ◽  
Solution Treatment ◽  
Nickel Base Superalloy ◽  
Gamma Prime ◽  
Nickel Based Superalloy ◽  
Treatment Conditions ◽  
Nickel Base ◽  
Base Superalloy

Cast nickel based superalloy, Grade Inconel 738, is a material for turbine blades. Its rejuvenation heat treatment usually consist of solution treatment condition with temperature range of 1125-1205 oC for 2-6 hours. Then it is following with double aging process including primary aging at 1055oC for 1 hour and secondary aging at 845oC for 24 hours. However, the various selected temperature dropping program were performed during solution treatment to simulate the possible error of heating furnace. The maximum number of temperature dropping during solution treatment is varied from 1-3 times From all obtained results, the various temperature dropping during solution treatment conditions showed extremely the significant effect on the final rejuvenated microstructures and long-term gamma prime stability after heating at temperature of 900oC for 200 hours.

Study on the Cutting Force Modeling and Forecast Analysis in Machining Nickel Base Superalloy

2010 ◽  
Vol 431-432 ◽  
pp. 162-165
Author(s):  
Xin Yong Wang ◽  
Si Qin Pang ◽  
Qi Xun Yu
Keyword(s):  
Cutting Force ◽  
Processing Parameters ◽  
Good Effect ◽  
Nickel Base Superalloy ◽  
Cutting Force Prediction ◽  
Nickel Based Superalloy ◽  
Force Modeling ◽  
Reasonable Choice ◽  
Classical Linear Regression ◽  
Nickel Base

Nickel-based superalloy is one kind of typical hard-processing materials, its cutting force is more complicated than other materials. Studies have shown that Response Surface Methodology model is more suitable than classical linear regression model, especially regression coefficients are more significantly. And the analysis of the linear effects , secondary effects and interactions effects can be more effective ,so as to achieve a good effect of cutting force prediction, to provide a reliable basis for a reasonable choice of processing parameters.

Experimental Study on Cutting Force in Machining Nickel Base Superalloy

2010 ◽  
Vol 455 ◽  
pp. 379-382
Author(s):  
X.Y. Wang ◽  
S.Q. Pang ◽  
Q.X. Yu
Keyword(s):  
Cutting Force ◽  
Elevated Temperatures ◽  
High Strength ◽  
Cutting Parameters ◽  
Advanced Materials ◽  
Nickel Base Superalloy ◽  
Nickel Based Superalloy ◽  
Actual Production ◽  
Nickel Base ◽  
Base Superalloy

Studies on cutting force lead an extremely important guiding significance in the actual producing. Nickel base superalloy is widely in the manufacture of components for some important industrial areas, because of their ability to retain high-strength at elevated temperatures. It possesses excellent performance as a class of advanced materials. Because of its very poor machinability, the study on cutting force in machining nickel-based superalloy in the actual production or scientific research is relatively less. In this paper, Author aim at two kinds of typical difficult-to-machining materials nickel base superalloy (GH4169, K24). Contrasting with other typical materials ,such as 45# steel and high strength steel 35CrMnSi，study the law of cutting force effected by cutting parameters under the conditions of turning . Intuitive analysis of cutting force changes with the cutting parameters, as well as these characteristics on three-axis force of each type of material, that is to improve its processability and to provide guidance to actual production has a positive significance.

Influence of Process Parameters on Cooling Conditions in Nickel Base Superalloy Investment Casting

2015 ◽  
Vol 641 ◽  
pp. 124-131 ◽  
Author(s):  
Jacek Nawrocki ◽  
Dariusz Szeliga ◽  
Krzysztof Kubiak ◽  
Hubert Matysiak ◽  
Maciej Motyka ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Thermal Insulation ◽  
Process Parameters ◽  
Crystallization Process ◽  
Nickel Base Superalloy ◽  
Mould Temperature ◽  
Temperature Range ◽  
Nickel Base ◽  
Inconel 713C ◽  
Base Superalloy

The published results of the research on crystallization process of nickel base superalloy castings rarely take into account the effect of the wall thickness of the casting. Current study presents a comprehensive assessment of the impact of molten alloy temperature, mould temperature, mould thermal insulation and casting diameter on crystallization process of polycrystalline nickel base superalloy. Research was designed and conducted as an factorial experiment at two levels. Different diameter samples were designed and optimised by the numerical simulation of solidification process using ProCAST software. Inconel 713C nickel based superalloy was cast into alumina-silicate moulds produced by lost wax technique. Casting temperature during solidification was measured using thermocouples installed in sections having a diameter of 10 and 20 mm. Statistical analysis of the influence of the main process parameters and casting diameter on cooling rate, total freezing temperature range and critical temperature range was performed. Cooling rates in the range from 0.21 to 1.24°C/s were obtained. It was found that diameter of the casting, mould temperature and the thermal insulation of the mould had significant effect on the cooling rate.

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