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Über dieses Buch

Laser shock processing (LSP) is a new and promising surface treatment technique for improving the fatigue durability, corrosion, wear resistance and other mechanical properties of metals and alloys. During LSP, the generated shock wave can introduce a deep compressive residual stress into the material, due to its high-pressure (GPa-TPa), ultra-fast (several tens nanoseconds), ultra-high strain-rate and high-energy. The overall properties and behavior of metal materials subjected to LSP were significantly improved because a refined surface layer was successfully obtained. Nevertheless, up to now, a clear scenery between micro-structure and macro-property of the refined surface layer, especially formation of sub-micrometer grains from coarse grains during severe plastic deformation, is still pending. Therefore, the basic studies of the underlying mechanism for grain refinement by ultra-high strain-rate presented in this book becomes more and more crucial.

Inhaltsverzeichnis

Frontmatter

Chapter 1. General Introduction

Abstract
This chapter presents the laser shock processing (LSP) process, recent development of LSP on alloys and metallic materials, typical applications of LSP and the scope of this book.
Yongkang Zhang, Jinzhong Lu, Kaiyu Luo

Chapter 2. Surface Integrity of LY2 Al Alloy Subjected to Laser Shock Processing

Abstract
This chapter presents a comprehensive literature review of the physical and mechanical mechanisms of LSP on metallic materials, which have been investigated in the past 30 years. In particular, more attentions have been focused on the effects of LSP on mechanical properties of LY2 Al alloys are also highlighted.
Yongkang Zhang, Jinzhong Lu, Kaiyu Luo

Chapter 3. Tensile Properties and Fatigue Lives of LY2 Al Alloy Subjected to Laser Shock Processing

Abstract
This chapter presents the effects of strain rate on the tensile properties and fracture morphologies of LY2 Al alloy subjected to LSP. Special attentions are paid to the effects of LSP processing parameters on the fatigue life and fracture morphology. In addition, the influence mechanisms of different LSP parameters on Al alloy are systematically revealed.
Yongkang Zhang, Jinzhong Lu, Kaiyu Luo

Chapter 4. Grain Refinement of LY2 Al Alloys Induced by Multiple Laser Shock Processing Impacts

Abstract
This chapter presents the effects of the multiple LSP impacts on the residual stresses in the depth direction, focusing especially on the change of micro-structure in different layers in the treated sample by multiple LSP impacts, and clearly reveals the underlying refinement mechanism of plastic deformation after multiple LSP impacts on LY2 Al alloy.
Yongkang Zhang, Jinzhong Lu, Kaiyu Luo

Chapter 5. Visual Inspection and Control Methods of Laser Sock Processing Effectiveness

Abstract
This chapter introduces a novel visual inspection and control method to evaluate the surface qualities of Al alloy by means of three parameters, i.e., surface roughness, surface residual stress, and hollow depth, and also presents the effects of the surface qualities of LSP zones upon the fatigue life of samples and the optimum conditions of LSP.
Yongkang Zhang, Jinzhong Lu, Kaiyu Luo

Chapter 6. Mechanical Properties of AISI 304 SS and its Welded Joint Subjected to Laser Shock Processing

Abstract
This chapter presents the effects of a single LSP impact on the nano-hardness, elastic modulus, residual stress, and phase transformation of AISI 304 SS. Further studies of different LSP paths on the mechanical properties and fracture morphology of the laser welded AISI 304 SS joint are presented and discussed.
Yongkang Zhang, Jinzhong Lu, Kaiyu Luo

Chapter 7. Stress Corrosion Cracking Resistance of AISI 304 SS Subjected to Laser Shock Processing

Abstract
This chapter investigates the effects of massive LSP impacts on the SCC behavior of AISI 304 SS and highlights the distribution of surface residual stress, the SCC initiation and micro-structure on the top surface of three types of U-bend samples. The emphasis is placed on the mechanism of massive LSP impacts on the corrosion resistance of AISI 304 SS.
Yongkang Zhang, Jinzhong Lu, Kaiyu Luo

Chapter 8. Grain Refinement of AISI 304 SS Induced by Multiple Laser Shock Processing Impacts

Abstract
This chapter describes the micro-structural evolution and grain refinement process of AISI 304 SS subjected to multiple LSP impacts by means of cross-sectional optical microscopy and transmission electron microscopy observations, and reveals the plastic strain-induced grain refinement mechanism of FCC materials with very low stacking fault energy.
Yongkang Zhang, Jinzhong Lu, Kaiyu Luo

Chapter 9. Electrochemical Corrosion Resistance of AISI 304 SS Weldment Treated by Laser Shock Processing

Abstract
This chapter figures out effects of LSP on electrochemical corrosion resistance of AISI 304 SS weldments after cavitation erosion. Through the electrochemical test, AISI 304 SS weldments without and with LSP impacts after cavitation erosion are studied. Influence mechanism of LSP on electrochemical corrosion resistance of AISI 304 SS weldments after cavitation erosion is also revealed.
Yongkang Zhang, Jinzhong Lu, Kaiyu Luo

Backmatter

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