scholarly journals Comparison between Microstructure Evolution in IN718 and ATI Allvac® 718PlusTM – Simulation and Trial Forgings

2011 ◽  
Vol 278 ◽  
pp. 168-173 ◽  
Author(s):  
Daniel Huber ◽  
Christof Sommitsch ◽  
Martin Stockinger
Keyword(s):  
Microstructure Evolution ◽  
Elevated Temperatures ◽  
Grain Structure ◽  
Design Parameters ◽  
Nickel Base Superalloy ◽  
Simulation Tools ◽  
Strain And Strain Rate ◽  
Turbine Disks ◽  
Microstructure Model ◽  
Nickel Base

Aerospace gas turbine disks operate in an environment of relatively high stresses caused by centrifugal forces and elevated temperatures. Because of the strong mechanical requirements and narrow specifications of such parts not only a correct, defect free final geometry is necessary, but also a defined microstructure. Even though the microstructure evolution during thermo-mechanical processing is well studied and understood for superalloys like IN718, the influences cannot easily be described analytically. Thus simulation tools are used to assure process stability and to optimize design parameters to meet the tough requirements in aerospace industries. Microstructure simulation of IN718 (and other materials) is well established at Bohler Schmiedetechnik GmbH & Co KG and appreciated by its customers. The advent of the newly developed nickel-base superalloy ATI Allvac® 718PlusTM led to extensive investigations and the development of an adapted microstructure model by Bohler Schmiedetechnik GmbH & Co KG and its research partners. Aim of this paper is a comparison of the microstructure evolution in IN718 and ATI Allvac® 718PlusTM during the thermo-mechanical treatment of turbine disks. Influences of process temperature, strain and strain rate on the final grain size are discussed by finite element simulations with a coupled grain structure model. Experimental results from trial forgings are compared with the outcome of the microstructure simulations.

Plastic Flow and Microstructure Evolution during Thermomechanical Processing of a PM Nickel-Base Superalloy

2013 ◽  
Vol 44 (6) ◽  
pp. 2778-2798 ◽  
Author(s):  
S. L. Semiatin ◽  
K. E. McClary ◽  
A. D. Rollett ◽  
C. G. Roberts ◽  
E. J. Payton ◽  
...  
Keyword(s):  
Plastic Flow ◽  
Microstructure Evolution ◽  
Thermomechanical Processing ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

Application of Atom Probe Microanalysis for Understanding Microstructure Evolution in Nickel Base Superalloy Welds

2000 ◽  
Vol 6 (S2) ◽  
pp. 350-351
Author(s):  
S. S. Babu ◽  
S. A. David ◽  
M. K. Miller
Keyword(s):  
Microstructure Evolution ◽  
Predictive Models ◽  
Strong Relationship ◽  
Atom Probe ◽  
Systematic Investigation ◽  
Nickel Base Superalloy ◽  
Cooling Conditions ◽  
Nickel Base ◽  
Base Superalloy

The characterization of the microstructure evolution during welding of nickel base superalloys is required for efficient reuse and reclamation of used and failed components. Previous atom probe analysis of electron-beam and laser-beam welds revealed complex alloying elemental partitioning between the γ and γ phases. Rapid cooling conditions in the weld leads to non-equilibrium partitioning and large amplitude Cr and Co levels in the γ phase. These results indicated that there is a strong relationship between weld cooling rate and the precipitation of γ′ precipitates from the γ phase. To understand and develop predictive models, a systematic investigation of the microstructure evolution in CM247DS alloy under controlled thermomechanical conditions are being performed. This paper describes some recent results on the elemental partitioning between γ and γ′ phases obtained with atom probe microanalysis.

Creep Processes in MAR-M247 Nickel-Base Superalloy

2016 ◽  
Vol 258 ◽  
pp. 603-606
Author(s):  
Marie Kvapilová ◽  
Květa Kuchařová ◽  
Karel Hrbáček ◽  
Vàclav Sklenička
Keyword(s):  
Creep Deformation ◽  
Elevated Temperatures ◽  
Dislocation Creep ◽  
Nickel Base Superalloy ◽  
Deformation And Fracture ◽  
Creep Life Prediction ◽  
Controlling Mechanism ◽  
Nickel Base ◽  
Creep Regime ◽  
Base Superalloy

Creep processes in MAR-M247 Nickel - Base Superalloy were studied at elevated temperatures. The stress exponents of creep rate n and time to fracture m indicate power-low (dislocation) creep regime and suggest the same controlling mechanism for the creep deformation and fracture. The variation of values of parameter n within the interval of applied stress may indicate changes in the rate-controlling creep deformation mechanism. The possibility of using of Monkman-Grant relationship for creep life prediction was demonstrated.

Numerical and Experimental Analysis of Attaching-Mandrel Process Under Multi-Pass Cold Spinning Process on Superalloy GH3030

2019 ◽  
Author(s):  
Li Zixuan ◽  
Shu Xuedao ◽  
Cen Zewei ◽  
Zhang Song
Keyword(s):  
Production Efficiency ◽  
Thickness Distribution ◽  
Grain Structure ◽  
Combination Method ◽  
Nickel Base Superalloy ◽  
Forming Quality ◽  
Spinning Process ◽  
Conventional Spinning ◽  
Hot Spinning Process ◽  
Nickel Base

Abstract The superalloy products formed by multi-pass conventional spinning are widely used in rotary forming parts with complex shapes. As the connection of each forming pass, the attaching-mandrel process has an important influence on forming quality and production efficiency. The hot spinning process is usually adopted in superalloy forming because its poor plasticity in normal temperature, meanwhile, it brings the poor surface quality of the parts and huge energy consumption. For this reason, the cold spinning and the attaching-mandrel process of nickel-base superalloy GH3030 are studied. The combination method of experiment and simulation is used to study the attaching-mandrel process based on one-forward-pass spinning process. The effects of pass pitch and the attaching-mandrel velocity on the tool forces, parts stress field, strain field and wall thickness distribution are analyzed. The microstructure of the part is divided into three layers: outer, middle and inner layer. The grain size of each layer is compared. Then the effect of different pass pitch on the grain structure is clarified. The results show that the reasonable pass pitch and the attaching-mandrel velocity can improve the forming quality and production efficiency. The multi-pass cold spinning process on superalloy GH3030 is feasible. The excessive pass pitch can cause seriously grain elongation, the grain boundaries are blurred, and even cracking.

scholarly journals Fatigue Crack Crowth Resistance in Nickel-Base Superalloy at Elevated Temperatures.

1997 ◽  
Vol 63 (615) ◽  
pp. 2298-2302 ◽  
Author(s):  
Norio KAWAGOISHI ◽  
Qiang CHEN ◽  
Hironobu NISITANI ◽  
Masahiro GOTO ◽  
Hideho TANAKA
Keyword(s):  
Fatigue Crack ◽  
Elevated Temperatures ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

SPECIAL METALS INCONEL 740H

Alloy Digest ◽  
2020 ◽  
Vol 69 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Power Plants ◽  
Elevated Temperatures ◽  
Coal Ash ◽  
High Strength ◽  
Heat Treating ◽  
Nickel Base Superalloy ◽  
Unique Combination ◽  
Nickel Base ◽  
Base Superalloy

Abstract Special Metals Inconel 740H (UNS N07740) is a precipitation hardenable, nickel-base superalloy that offers a unique combination of high strength and creep resistance at elevated temperatures along with resistance to coal ash corrosion. This alloy was originally targeted for use in advanced ultra-supercritical (A-USC) power plants. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: Ni-762. Producer or source: Special Metals Corporation.

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