By Xudong Ren
The target of this booklet is to give foundational study at the nano-crystallization, high-temperature amendment, micro-structure evolution and plastic deformation prompted via laser surprise processing. during this regard, the focal point is on heat-resistant metal, aluminum alloy, Ti alloys and Ni-based alloys, delivering useful medical insights into the economic purposes of laser surprise processing (LSP) know-how. The booklet addresses numerous issues, i.e., the formation mechanism and productiveness development of nano-crystalline diamond through laser processing, the outside integrity and fatigue lives of heat-resistant steels, Ti alloys and Ni-based alloys after LSP with various processing parameters, tensile houses and fractural morphology after LSP at assorted temperatures, strain-rates and grain refinement mechanisms in keeping with the micro-structure evolution. furthermore, the influence of heating temperature and publicity time on tension thermal leisure and the impression of compressive tension at the rigidity depth issue of hole-edge cracks via excessive pressure price laser surprise processing also are analyzed. a brand new kind of statistical facts version to explain the fatigue cracking development with constrained information is proposed in line with the honour of the consequences of fracture development at the reliability and self belief level.
This e-book is meant for researchers, engineers and postgraduates within the fields of nanotechnology and micro-engineering who're attracted to the partial or total strengthening of fabrics, specially people with a spotlight on floor integrity and fatigue life.
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Laser Shocking Nano-Crystallization and High-Temperature Modification Technology
The purpose of this publication is to offer foundational examine at the nano-crystallization, high-temperature amendment, micro-structure evolution and plastic deformation brought about via laser surprise processing. during this regard, the focal point is on heat-resistant metal, aluminum alloy, Ti alloys and Ni-based alloys, delivering useful clinical insights into the commercial purposes of laser surprise processing (LSP) know-how.
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Additional info for Laser Shocking Nano-Crystallization and High-Temperature Modification Technology
Example text
Reprint from Ref. [37], Copyright 2011, with permission from Elsevier 26 2 LSP Numerical Simulation fatigue crack growth rates, which could be attributed to the compressive residual stress induced by LSP. As a result, the effective SIF that controls the fatigue crack growth in the LSP specimen is lower than that of the non-LSP case. The scatter in the spacing could be attributed primarily to the fact that striation formation is a highly localized event. The striation spacing is also dependent on both the SIF and metallurgical factors such as variations in the grain orientation [42].
This also implies that the slope of the stress–strain curve decreases with the amount of tensile work at a given stress. 4. LSP introduces a compressive residual stress field at the surface of 00Cr12 alloy (up to −382 MPa). The residual compressive stress will be relaxed under high temperature. Monotonic and cyclic relaxations are the reasons why residual stresses are not stable at high temperature. 5 MPa, decreasing about 64 % at the temperature of 600 °C. 5. LSP successfully enhances the yield strength and tensile strength of the 00Cr12 alloy.
The stress relaxation process could be expressed by the Zener–Wert–Avrami function as [45, 46] rt ¼ exp½ÀðAtÞm r0 ð3:1Þ Q Þ RT ð3:2Þ A ¼ BexpðÀ where rt is the surface residual stress in high-temperature process, r0 is the surface residual stress after LSP, m is a numerical parameter dependent on the dominant relaxation mechanism, t is the aging time, A is a function dependent on the material and temperature, B is a constant, and Q is the activation enthalpy for the relaxation process. R is the Boltzmann constant, and T is the aging temperature.