Investigation on Performance of QT700-2 Material by Laser Peening

Judith C. Yang; Jian Zhong Zhou; Yong Kang Zhang; Chao Jun Yang; Jin Zhon Lu

doi:10.4028/www.scientific.net/MSF.471-472.43

Paper Titles

Compositional Design of Multiphase Composite Ceramic Tool Material Based on the Thermal Shock Resistance and Its Application
p.21

Modeling and Analyzing on Nonuniformity of Material Removal in Chemical Mechanical Polishing of Silicon Wafer
p.26

Development of a Cutting Database System with Prediction and Analysis Functions
p.32

Research on Multifunctional Micro Machining Equipment
p.37

Investigation on Performance of QT700-2 Material by Laser Peening
p.43

Evaluation and Measurement of Surface/Subsurface Crack Damage of Ground Ceramics
p.47

Growth of Nanocrystalline Diamond Films on Co-Cemented Tungsten Carbide Substrates by Hot Filament CVD
p.52

Ultrasonic Machining Mechanism of Sintered Nd-Fe-B Magnetic Materials
p.59

Research on Ultra-Precision Process of STAVAX ESR
p.63

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Investigation on Performance of QT700-2 Material by Laser Peening

Abstract:

With the advent of high-power pulsed lasers, laser peening has emerged as a new and very promising technique to improve the resistance properties of materials to fatigue, wear and corrosion. In this paper, the effect of laser peening on the surface performance of QT700-2 materials was investigated, the parameters of laser peening were optimized by an artificial neural network (ANN) method. A series of experiments was carried out by using a high-power, Q-Switched, pulsed neodymium-glass laser. The microstructure features were analyzed with SEM and the hardness and residual stresses at the surface and in-depth were measured. The results indicate that the depth of hardened layer was about 0.31ı1.40mm for a different shot number of 1-4 times and the compressive residual stress at the surface increases with increasing laser pulse energy, from -165MPa for the low energy 12J to -410MPa for the higher energy 20J. Laser peening can restrain nucleation of fatigue cracks and improve the fatigue life of nodular cast iron materials.