By Xudong Ren
The objective of this ebook is to provide foundational learn at the nano-crystallization, high-temperature amendment, micro-structure evolution and plastic deformation precipitated via laser surprise processing. during this regard, the focal point is on heat-resistant metal, aluminum alloy, Ti alloys and Ni-based alloys, supplying helpful clinical insights into the economic purposes of laser surprise processing (LSP) know-how. The booklet addresses a number of issues, i.e., the formation mechanism and productiveness development of nano-crystalline diamond by means of laser processing, the skin integrity and fatigue lives of heat-resistant steels, Ti alloys and Ni-based alloys after LSP with varied 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 effect of compressive rigidity at the tension depth issue of hole-edge cracks via excessive pressure cost laser surprise processing also are analyzed. a brand new kind of statistical facts version to explain the fatigue cracking development with restricted facts is proposed in line with the respect of the results of fracture development at the reliability and self assurance level.
This publication 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, in particular people with a spotlight on floor integrity and fatigue life.
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Extra resources for Laser Shocking Nano-Crystallization and High-Temperature Modification Technology
The crack propagation direction is determined according to the maximum hoop stress criterion (MHSC) [35, 36], and KI and KII are determined at every step. 2 Crack Growth Model The FNK model was used to determine the crack growth rate, which could account for retardation near threshold, acceleration near fast fracture, and the crack closure. 3 Comparison of the Simulation and Experimental Fatigue Crack Behaviors … 21 Fig. 6 Sample of the singularized element growing along with the crack tip of 7050-T7451 aluminum alloy by Franc2D/L.
Reprint from Ref. 2 Mechanical Properties and Residual Stresses Changing … 41 Fig. 10 Dimensions and schematic diagrams of the standard tensile fatigue specimen of 00Cr12 alloy after LSP. Reprint from Ref. 4 LSP on Residual Stresses at Elevated Temperature 00Cr12 specimens, as shown in Fig. 54 GW/cm2 in the strong laser laboratory of Jiangsu University. Large-diameter quarter-wave plate and high-strength largediameter ﬁlm polarizer were adopted. The laser beam spot size was maintained at a diameter of 6 mm, and the overlapping rate of the laser spot was 50 %.
Khadhraoui M et al (1997) Experimental investigations and modelling of relaxation behaviour of shot peening residual stresses at high temperature for nickel base superalloys. Mater Sci Technol 13:360–367 8. Cai DY et al. (2006). Precipitation and residual stress relaxation kinetics in shot-peened Inconel 718. J Mater Eng Perform 15(5):614–617 9. Zhong Z et al (2012) Thermal relaxation of residual stress in laser shock peened Ti-6Al-4 V alloy. Surf Coating Technol 206:4619–4627 10. Zhong Z et al (2011) A ﬁnite element study of thermal relaxation of residual stress in laser shock peened IN718 superalloy.