Gradient Microstructure in Laser Shock Peened Materials: Fundamentals and Applications (Springer Series in Materials Science, 314)

✍ Scribed by Liucheng Zhou, Weifeng He

• Publisher: Springer
• Year: 2021
• Tongue: English
• Leaves: 241
• Category: Library

✦ Synopsis

This book introduces the fundamentals and principles of laser shock peening (LSP) for aeronautical materials. It focuses on the innovation in both theory and method related to LSP-induced gradient structures in titanium alloys and Ni-based alloys which have been commonly used in aircraft industries. The main contents of the book include: the characteristics of laser shock wave, the formation mechanism of gradient structures and the strengthening-toughing mechanism by gradient structures. The research has accumulated a large amount of experimental data, which has proven the significant effectiveness of LSP on the improvement of the fatigue performance of metal parts, and related findings have been successfully applied in aerospace field. This book could be used by the researchers who work in the field of LSP, mechanical strength, machine manufacturing and surface engineering, as well as who major in laser shock wave and materials science.

✦ Table of Contents

Foreword
Preface
Contents
Contributors
1 General Introduction
1.1 Typical Applications of LSP in the Aviation Field and Recent Development
1.2 Why Do We Study the Gradient Microstructure Induced by LSP in Aeronautical Materials?
1.3 Scope of the Book
References
2 Characteristics of Laser-Induced Plasma Shock Wave in Metal Materials
2.1 Introduction
2.2 The Principle of the Formation of the Laser-Induced Plasma Shock Wave
2.2.1 The Process of the Formation of the Laser-Induced Plasma Shock Wave
2.2.2 The Propagation and Attenuation of the Laser-Induced Plasma Shock Wave
2.3 The Characteristics of Laser-Induced Plasma Shock Waves Under Different Process Parameters
2.3.1 Test Method For the Characteristics of Laser-Induced Plasma Shocks
2.3.2 Laser Power Density
2.3.3 With or Without a Water Confinement Layer
2.3.4 Absorbing Layer
2.4 Model of Laser-Induced Plasma Shock Pressure
2.4.1 The Fabbro’s Model
2.4.2 Modified Model
References
3 Gradient Microstructure Characteristics and the Formation Mechanism in Titanium Alloy Subjected to LSP
3.1 Introduction
3.2 Residual Stress Characteristics of LSP in Titanium Alloy
3.2.1 Experiments and Methods
3.2.2 The Law of the Influence of Laser Power Density
3.2.3 The Law of the Influence of Impact Times
3.2.4 The Law of the Influence of Overlapping Rate
3.2.5 Stability of Residual Stress Induced by LSP Under Thermal and Mechanical Load
3.3 Characteristics of Gradient Microstructure of LSP in Titanium Alloy
3.3.1 Experiments and Methods
3.3.2 XRD Phase
3.3.3 TEM Characterization
3.4 Mechanism of the Formation of Gradient Microstructure Induced by LSP in Titanium Alloy
3.4.1 Formation of Dislocation in Titanium Alloy by LSP
3.4.2 Formation of Nanocrystals of the Metal Materials with High Stacking-Fault Energy by LSP
3.5 The Characteristics of Gradient Microstructures and the Mechanism for the Martensite Transformation of LSP in AISI 304 Stainless Steels
3.5.1 Introduction
3.5.2 LSP Induced Surface Nanocrystallization and Martensite Transformation in 304 Stainless Steel
References
4 Improvement of High Cycle Fatigue Performance in the Titanium Alloy by LSP-Induced Gradient Microstructure
4.1 Experiment Method of Vibration Fatigue Test for Titanium Alloy Blade of Aero-Engine
4.2 Improvement of High Cycle Fatigue Performance in the Titanium Alloy by LSP-Induced Gradient Microstructure
4.2.1 Vibration Fatigue Performance of Samples
4.2.2 Rotary Bending Fatigue Performance of Samples at High Temperature
4.2.3 Vibration Fatigue Performance of Blades
4.3 High Cycle Fatigue Performance in LSPed Titanium Alloys Subjected to Foreign Object Damage
4.3.1 Test of Titanium Alloy Blades Injured by Foreign Objects in Air Cannon
4.3.2 Fatigue Behavior of TC4 Titanium Alloys Damaged by a Foreign Object Under LSP
4.3.3 Improving the Tolerance to Damage of the Titanium Alloy Blade by LSP
References
5 Improvement of High Temperature Fatigue Performance in Ni-Based Alloys by LSP-Induced Gradient Microstructures
5.1 Introduction
5.2 Gradient Microstructure Characteristics Induced by LSP in the GH4133B Ni-Based Superalloy
5.2.1 GH4133B Ni-Based Superalloy and the Principle and Experimental Procedure of LSP
5.2.2 Gradient Microstructure Induced by LSP and Its Thermal Stability
5.2.3 Compressive Residual Stress Induced by LSP and Its Thermal Relaxation
5.2.4 Nanohardness and Its Thermal Stability
5.3 High Temperature High-and-Low Cycle Combined Fatigue Performance of GH4133B Ni-Based Superalloy at 538 ℃
5.3.1 High Temperature High-and-Low Cycle Combined Fatigue Performance
5.3.2 Observation and Analysis of Fatigue Fracture of Ni-Based Superalloy Turbine Blades
5.4 Gradient Microstructure Characteristics Induced by LSP in the K417 Ni-Based Superalloy
5.4.1 The K417 Ni-Based Superalloy and Experimental Procedure of LSP
5.4.2 Gradient Microstructure Induced by LSP and Its Thermal Stability
5.4.3 Compressive Residual Stress Induced by LSP and Its Thermal Relaxation
5.5 High Temperature High Cycle Combined Fatigue Performance at 800 ℃
References
6 Mechanical Behavior and the Strengthening Mechanism of LSP-Induced Gradient Microstructure in Metal Materials
6.1 Introduction
6.2 Mechanical Behavior of the LSP-Induced Gradient Microstructure in Titanium Alloy
6.2.1 The Model of Crystal Plasticity of the LSP-Induced Gradient Microstructure in Titanium Alloy
6.2.2 Multi-scale Mechanical Behavior of the LSP-Induced Gradient Microstructure
6.3 A Molecular Dynamics Simulation of Crack Propagation in Pure Titanium Under Uniaxial Tension After LSP
6.3.1 A Molecular Dynamics Simulation of Crack Propagation in Pure Titanium Under Uniaxial Tension
6.3.2 Molecular Dynamics Simulation of the Mechanism for Microstructure Deformation in Nano-Titanium Under Uniaxial Tension
6.4 Law of the Influence of LSP-Induced Gradient Microstructure on the Vibration Characteristics of a Thin Cantilever Beam Specimen
6.4.1 Theoretical Analysis of the Law of the Influence of Local Stiffness on the Vibration Modal Frequency of Thin Cantilever Beam Specimen
6.4.2 Numerical Analysis of the Law of the Influence of LSP-Induced Gradient Microstructure on Vibration Modes of the Thin Cantilever Beam Specimen
6.4.3 Experimental Verification of the Law of the Influence of the LSP-Induced Gradient Microstructure on Vibration Modes of the Thin Cantilever Beam Specimen
References
7 Study on the Compound Process of LSP and the Strengthening Mechanism on Aero-Engine Blades
7.1 Introduction
7.2 The Compound Process of LSP and Vibratory Finishing on Titanium Alloy
7.2.1 Experiments and Methods
7.2.2 Residual Stress and Surface Roughness
7.2.3 Microstructure Characteristics
7.2.4 Fatigue Strength
7.3 Regain the Fatigue Strength of LAMed Titanium Alloy via LSP
7.3.1 Experiments and Methods
7.3.2 Distribution of Residual Stress
7.3.3 Characterization of the Microstructure
7.3.4 Mechanical Properties
7.3.5 Fatigue Strength
7.4 Enhance Aluminizing via LSP-Induced Gradient Microstructure with Good Thermal Stability
7.4.1 Experiments and Methods
7.4.2 Microstructure Evolution Induced by LSP
7.4.3 Aluminizing and Microstructure Characterization
7.4.4 Element Distribution in the Aluminizing Coatings
7.4.5 Mechanism of Diffusion on a Surface of a Nanostructured Layer
7.4.6 HCF Strength
7.5 Improve High Cycle Fatigue Performance of Gas Tungsten Arc Welded Ti6Al4V Titanium Alloy by Warm Laser Shock Peening
7.5.1 Experiments and Methods
7.5.2 Residual Stress Distribution
7.5.3 Cyclic Stability of Surface Residual Stress
7.5.4 Microstructures Induced by WLSP
7.5.5 High Cycle Fatigue Performance
References