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Study of Mechanical Behavior and Application of Single Crystal Superalloy Base on Finite Deformation Crystallographic Theory

Author: WanJianSong
Tutor: YueZhuFeng
School: Northwestern Polytechnical University
Course: Solid Mechanics
Keywords: Nickel-base single crystal superalloy Turbine rotor blades Finite deformation Slip crystal plasticity theory FEM Instantaneous tensile properties Tension / compression asymmetry Creep life Complex stress state Low cycle fatigue life Unified life model Grain boundary Double crystal Three crystal Load spectrum
CLC: TG132
Type: PhD thesis
Year: 2003
Downloads: 929
Quote: 17
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Abstract


Development and application of nickel-base single crystal superalloy The main purpose is to improve the military and civilian engine performance, life and reliability. In developed countries, nickel-base single crystal superalloy because of its superior high temperature performance are widely used in aviation gas turbine engines and ground key components - turbine rotor blades; in the country, some engines have also started using single crystal turbine rotor blades. There is no substitute can be directly used in nickel-base single crystal superalloy turbine rotor blades of aircraft engines better material. However, the mechanical properties of single crystal material anisotropy restricted its development and application of its engineering applications, materials and their potential applications, theory and challenges. This paper aims to mechanics and materials science from the point of view for the combination of single crystal material anisotropy characteristics, using a combination of macro and microscopic studies, theoretical analysis, computational models, experimental evaluation and verification of the method of combining, to carry out a single anisotropic grain blade strength analysis and lifetime prediction research. Main work summarized as follows: 1. Slip crystal plasticity based finite deformation theory, tangent coefficient method, the preparation of the slip rate dependent crystal plasticity constitutive model for finite element subroutine, according to the theory of crystal plasticity characteristics are given in the local coordinate system and the overall coordinate system updating methods and specific steps stress. Given the current commercial finite element software package is no such constitutive model, this finite element subroutine as a user subroutine (UMAT) added to the ABAQUS package. Using slip system orientation factor, a detailed analysis of three different orientations slip Family oriented slip system resolved shear stress, strain and macroscopic stress and strain relationships. 2. Derived nickel base single crystal superalloy DD3 static modulus of elasticity and the orientation relationship of expression. DD3 instantaneous tensile properties for a more complete experimental work. In the discussion on the basis of experimental data of nickel base single crystal static modulus of elasticity, yield strength, ultimate strength, elongation and shrinkage of the orientation section, and the temperature dependence of the loading rate on the yield strength and ultimate strength of impact, and the fracture morphology were observed, discussed the slip system startup situation. Using the macro, meso method of combining discussed nickel base single crystal superalloy tension / compression asymmetry phenomenon and its microscopic mechanism. The following shows the peak temperature, analyzing nickel-base single crystal superalloy yield characteristics of specific methods, LCP model as well as the scope of octahedral and hexahedral slip under tension in the instant law. 3. In the finite deformation theory of crystal slip is given on the basis of nickel-base single crystal superalloy creep constitutive model for nickel-base single crystal superalloy creep rupture life orientation correlations were analyzed, longitudinal and transverse orientation Correlation of the law. The method based on continuous media derived creep over CRYSTALLIZATION concrete expression of shaft rotation, and the use of the concept of crystal axis of rotation, orientation on the creep correlation explained. Based on high-temperature nickel-base single crystal material damage evolution microscopic mechanism, the use of single-parameter and two-parameter method, the proposed two creep life prediction model. For engineering applications. In the experiments are given based on the exponential creep life prediction model. 4. With smooth round and notched specimens for DD3 single crystal nickel-base superalloys, low cycle fatigue properties were studied in experiments and finite element calculation based on the results presented under complex stress state of low cycle fatigue life model. In CMSX-4 nickel base single crystal superalloy experiments suggest a consideration on the basis of mechanical fatigue, creep and thermal fatigue life of the unified interaction model. All experiments were carried out on the SEM analysis of fracture discussed nickel-base single crystal superalloy fatigue, creep damage Mesomechanism. 5. Designed three-point bending test pieces for single-crystal grains and grain boundary cracks parallel to the grain and the grain boundary cracks double crystal vertical fracture toughness, fatigue resistance was investigated experimentally investigated mono-and bi-crystal fracture toughness values and fatigue crack growth rate, and the use of self-prepared crystal slip rate-dependent finite deformation finite element program, analyzing a dual crystal and three crystal grain boundaries near the stress and strain structure. 6. XX engine under load spectrum, calculated XX engine single crystal turbine blades in the actual flight load spectrum structure under stress and the corresponding fatigue - creep life.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Special physical properties of alloys
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