Anisotropic Constitutive Modeling of a Single Crystal Superalloy at Elevated Temperature

1990 ◽  
Vol 43 (5S) ◽  
pp. S345-S352 ◽  
Author(s):  
D. C. Stouffer ◽  
M. Y. Sheh ◽  
L. T. Dame
Keyword(s):  
Stress State ◽  
Single Crystal ◽  
Back Stress ◽  
Flow Equation ◽  
Single Crystal Superalloy ◽  
Test Results ◽  
State Variables ◽  
State Variable ◽  
Crystallographic Slip ◽  
Nickel Base

An anisotropic constitutive model based on crystallographic slip theory was formulated for nickel-base single crystal superalloys. The current equations include both drag stress and back stress state variables in the inelastic flow equation for slip in each slip system. Experiments were conducted to evaluate the need of back stress in the model. The test results showed the effect of reverse inelastic flow on unloading is orientation dependent, and that a back stress state variable in the inelastic flow equation is necessary for predicting the anelastic behavior. Model correlations and predictions with experimental data are presented for the single crystal superalloy Rene’ N4 at 760C and 982C.

A Crystallographic Model for the Tensile and Fatigue Response for Rene´ N4 at 982°C

1990 ◽  
Vol 57 (1) ◽  
pp. 25-31 ◽  
Author(s):  
M. Y. Sheh ◽  
D. C. Stouffer
Keyword(s):  
Stress State ◽  
Single Crystal ◽  
Back Stress ◽  
Flow Equation ◽  
Stress Effect ◽  
State Variables ◽  
State Variable ◽  
Crystallographic Slip ◽  
Anelastic Behavior ◽  
Nickel Base

An anisotropic constitutive model based on crystallographic slip theory was formulated for nickel-base single crystal superalloys. The current equations include both drag stress and back stress state variables to model the local inelastic flow. Specially designed experiments have been conducted to evaluate the existence of back stress in single crystals. The results showed that the back stress effect of reverse inelastic flow on the unloading stress is orientation dependent, and a back stress state variable in the inelastic flow equation is necessary for predicting anelastic behavior. Model correlations and predictions of experimental data are presented for the single crystal supperalloy Rene´ N4 at 982°C.

A Phenomenologically Based Constitutive Model for Rene´ 95

1992 ◽  
Vol 114 (4) ◽  
pp. 340-347 ◽  
Author(s):  
J. A. Sherwood ◽  
D. C. Stouffer
Keyword(s):  
Constitutive Model ◽  
Damage Accumulation ◽  
Evolution Equations ◽  
Internal State ◽  
Cyclic Hardening ◽  
Back Stress ◽  
Flow Equation ◽  
State Variables ◽  
State Variable ◽  
Internal State Variables

A unified constitutive model incorporating internal state variables based upon the deformation phenomena that are observed to occur at the microstructural level has been developed and applied to Rene´ 95. Material hardening is modeled using dragstress and back-stress state variables, while the reduction in the material’s load-carrying capability is described by using a damage-accumulation state variable. Application of the model to the tensile, cyclic, and creep loadings of Rene´ 95 at 650°C demonstrated that the model is capable of capturing cyclic hardening, damage accumulation, and tertiary creep by using one inelastic flow equation in concert with the state-variable-evolution equations.

The Effect of Tensile Stress on Oxidation Behavior of Nickel-Base Single Crystal Superalloy

2021 ◽  
pp. 109737
Author(s):  
Hai-Qing Pei ◽  
Meng Li ◽  
Ping Wang ◽  
Xiao-Hu Yao ◽  
Zhi-Xun Wen ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Single Crystal ◽  
Oxidation Behavior ◽  
Single Crystal Superalloy ◽  
Nickel Base

Tensile behavior of nickel-base single-crystal superalloy DD6

2015 ◽  
Vol 636 ◽  
pp. 608-612 ◽  
Author(s):  
Xinhong Xiong ◽  
Dunmiao Quan ◽  
Pengdan Dai ◽  
Zhiping Wang ◽  
Qiaoxin Zhang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Tensile Behavior ◽  
Single Crystal Superalloy ◽  
Nickel Base

Effect of misorientation on the fatigue life of nickel-base single crystal superalloy DD5 at 980°C

2021 ◽  
pp. 106479
Author(s):  
Piao Li ◽  
Wen Jiang ◽  
Shao-Shi Rui ◽  
Wei-xing Yao ◽  
Hui-ji Shi ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Single Crystal ◽  
Single Crystal Superalloy ◽  
Nickel Base

Creep Behavior of a 4.5% Re Nickel-Base Single Crystal Superalloy at High Temperature

2015 ◽  
Vol 750 ◽  
pp. 139-144 ◽  
Author(s):  
De Long Shu ◽  
Su Gui Tian ◽  
Xin Ding ◽  
Jing Wu ◽  
Qiu Yang Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Single Crystal ◽  
Deformation Mechanism ◽  
Creep Property ◽  
Single Crystal Superalloy ◽  
Micro Cracks ◽  
Initiation And Propagation ◽  
Temperature Ranges ◽  
Nickel Base

By means of heat treatment and creep property measurement, an investigation has made into the creep behaviors of a containing 4.5% Re nickel-base single crystal superalloy at high temperature. Results show that the elements W, Mo and Re are enriched in the dendrite arm regions, the elements Al, Ta, Cr and Co are enriched in the inter-dendrite region, and the segregation extent of the elements may be obviously reduced by means of heat treatment at high temperature. In the temperature ranges of 1070--1100 °C, the 4.5% Re single crystal nickel-based superallloy displays a better creep resistance and longer creep life. The deformation mechanism of the alloy during steady state creep is dislocations slipping in the γ matrix and climbing over the rafted γ′ phase. In the later stage of creep, the deformation mechanism of alloy is dislocations slipping in the γ matrix, and shearing into the rafted γ′ phase, which may promote the initiation and propagation of the micro-cracks at the interfaces of γ/γ′ phases up to the occurrence of creep fracture.

Research Progress in Nickel Base Single Crystal Superalloys

2020 ◽  
Vol 861 ◽  
pp. 113-121
Author(s):  
Zhao Jun Jiang ◽  
Jun Wang ◽  
Dong Mei Cao
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
New Technologies ◽  
Single Crystal Superalloy ◽  
Research Progress ◽  
Market Demand ◽  
Theoretical Simulation ◽  
Characterization Methods ◽  
Composition Design ◽  
Nickel Base

Nickel base single crystal superalloy is widely used in hot end parts of aeroengine because of its excellent creep, fatigue and oxidation resistance. In the face of strong market demand and the emergence of new technologies and methods, in 2019, nickel-based single crystal superalloys have made remarkable achievements in preparation and heat treatment processes, repair techniques, test methods, characterization methods, theoretical simulation analysis and composition design, which continuously promotes the development of nickel base single crystal superalloy to the direction of high performance and low cost. The present work reviews the progresses from preparation and heat treatment process, repair technology of service alloy structure, service evaluation of alloy, high flux composition design. The progress in the design, preparation and engineering application of superalloy materials will eventually promote the development of a new generation of aeroengine.

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