Microscopic surface topography of a wrought superalloy processed by laser shock peening

Surface topography of an upsetting wrought superalloy processed by laser shock peening was observed in microscale and a series of morphological characteristics such as surface reliefs with special orientation, destructive dimples were found. The longitudinal sizes of the micro surface structures are within 100 nm to 1000 nm generally. The mechanical response laws of metal materials under laser shock were proposed to explain the emergence of the special micro-structure characteristics. It can be concluded that the formation of surface reliefs is a release way of the internal stresses under laser shock and small dimples are deemed as an external representation of the release of impact energy in the mode of fracture damage.

[1]  R. Fabbro,et al.  Experimental determination by PVDF and EMV techniques of shock amplitudes induced by 0.6-3 ns laser pulses in a confined regime with water , 2000 .

[2]  Yong-Taek Im,et al.  Finite-element investigation of the wear and elastic deformation of dies in metal forming , 1999 .

[3]  S. Suresh.  Fatigue of materials , 1991 .

[4]  Laurent Berthe,et al.  Physics and applications of laser-shock processing , 1998 .

[5]  Marc A. Meyers,et al.  THE ONSET OF TWINNING IN METALS: A CONSTITUTIVE DESCRIPTION , 2001 .

[6]  M. Meyers.  Dynamic Behavior of Materials , 1994 .

[7]  K. Hilbert,et al.  Influence of waterjet peening and smoothing on the material surface and properties of stainless steel 304 , 2014 .

[8]  Francois Malherbe,et al.  Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus Attachment Patterns on Glass Surfaces with Nanoscale Roughness , 2009, Current Microbiology.

[9]  Hongqiang Chen,et al.  Characterization of Plastic Deformation Induced by Microscale Laser Shock Peening , 2004 .

[10]  R. Fabbro,et al.  Laser shock processing of aluminium alloys. Application to high cycle fatigue behaviour , 1996 .

[11]  O. Unal,et al.  Almen intensity effect on microstructure and mechanical properties of low carbon steel subjected to severe shot peening , 2014 .

[12]  Said Ahzi,et al.  A model for microstructure evolution in adiabatic shear bands , 1998 .

[13]  Huixue Yao,et al.  Effect of laser shock processing on the mechanical properties and fatigue lives of the turbojet engine blades manufactured by LY2 aluminum alloy , 2009 .

[14]  K. Lu,et al.  Microstructural evolution and nanostructure formation in copper during dynamic plastic deformation at cryogenic temperatures , 2008 .

[15]  K. Luo,et al.  Surface textural features and its formation process of AISI 304 stainless steel subjected to massive LSP impacts , 2014 .

[16]  B. Michel,et al.  Elasto-visco-plastic finite-element analysis of a cold upsetting test and stress-state validation by residual-stress measurements , 1995 .

[17]  Richard K. Leach,et al.  Ambiguities in the definition of spacing parameters for surface-texture characterization , 2002 .

[18]  S. Bagherifard,et al.  Fatigue behavior of a low-alloy steel with nanostructured surface obtained by severe shot peening , 2012 .

[19]  J. Zhong,et al.  Numerical simulation for stress/strain distribution and microstructural evolution in 42CrMo steel during hot upsetting process , 2008 .

[20]  M. Skarba,et al.  Laser shock peening effect on the dislocation transitions and grain refinement of Al–Mg–Si alloy , 2014 .

[21]  E. Hall,et al.  The Deformation and Ageing of Mild Steel: III Discussion of Results , 1951 .

[22]  S. Bhattacharjee,et al.  Effect of Membrane Surface Roughness on Colloid−Membrane DLVO Interactions , 2003 .

[23]  Tao Jin,et al.  Nonuniformity of morphology and mechanical properties on the surface of single crystal superalloy subjected to laser shock peening , 2016 .

[24]  X. Ling,et al.  Numerical modeling of residual stress induced by laser shock processing , 2014 .

[25]  M. Makou,et al.  Enamel surface roughness following debonding using two resin grinding methods. , 2004, European journal of orthodontics.

[26]  N. Petch,et al.  The Cleavage Strength of Polycrystals , 1953 .

[27]  Jinzhong Lu,et al.  Effect of initial surface topography on the surface status of LY2 aluminum alloy treated by laser shock processing , 2012 .

[28]  M. Preuss,et al.  Evolution of a laser shock peened residual stress field locally with foreign object damage and subsequent fatigue crack growth , 2015 .

[29]  N. Chawla,et al.  Surface roughness characterization of Nicalon™ and HI-Nicalon™ ceramic fibers by atomic force microscopy , 1995 .

[30]  X. Hua,et al.  Investigation of the crater-like microdefects induced by laser shock processing with aluminum foil as absorbent layer , 2015 .

[31]  Eugenio Oñate,et al.  Application of explicit FE codes to simulation of sheet and bulk metal forming processes , 1998 .