Kaiyu Luo – författare

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.

This book introduces the fundamentals of laser shock peening (LSP) and its effects on the corrosion behaviours of metal alloy materials. It focuses on innovations in theory and methods related to LSP-induced surface nanocrystallization and corrosion resistance in steels, Mg alloy and titanium alloy. The main contents of the book include the characteristics of laser shock wave, LSP-induced surface integrity and the anti-corrosion mechanism. The research has accumulated a large amount of experimental data, which has proven the significant effectiveness of LSP in improving the corrosion performance of metal alloy materials. The related findings provide theoretical guidance and a data foundation for the application of LSP in fields such as aerospace and nuclear industry. This book could be useful for researchers working in the fields of LSP, corrosion behaviour, machine manufacturing and surface engineering, as well as those majoring in laser shock wave and materials science. The analysis in the book will help readers deeply understand the anti-corrosion mechanism induced by LSP and may inspire them to further develop this technology.

This book introduces the laser hybrid additive manufacturing technology (LHAM) with alternately thermal and mechanical effects for the high-performance manufacturing of key components. Metal additive manufacturing (AM) technologies have made considerable progress in the basic theoretical field since its invention in the 1970s. However, there are still some difficulties in the coordinated control of the structure and performance, containing the challenges of “structure control” against deformation and cracking of the formed metallic components incurred by internal stress and “performance control” against poor fatigue property of formed metallic components incurred by metallurgical defects. This book surveys the most relevant papers about the influence of laser shock wave on the microstructural evolution, residual stress, metallurgical defect, and mechanical properties that have become the foundation to elucidate the principles and effects of LHAM technology. This book is separated into four parts to fully present the LHAM technology. The first part reviews the background of LHAM technology. The second part explains the theoretical basis of the thermal effects of laser additive manufacturing (LAM) and mechanical effects of laser shock peening (LSP). The other two parts specifically describe the microstructural evolution, residual stress, metallurgical defect, and mechanical properties using LHAM technology. This book benefits the audience in the field of mechanical engineering and materials sciences, since LHAM technology is suitable for the manufacturing and applications of the key components of aero-engine. The analysis in the book helps the audience deeply understand the mechanism of LHAM technology. The authors’ unique thinking about LHAM technology also runs through the book, which may enlighten the audience to further develop LHAM technology.