Mechanism of fatigue performance enhancement in a laser sintered superhard nanoparticles reinforced nanocomposite followed by laser shock peening

Dong Lin, Purdue University
Chang Ye, Purdue University
Yiliang Liao, Purdue University
Sergey Suslov, Birck Nanotechnology Center, Purdue University
Richard Liu, Purdue University
Gary J. Cheng, Birck Nanotechnology Center, Purdue University

Date of this Version



J. Appl. Phys. 113, 133509 (2013)


Copyright (2013) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 113, 133509 (2013) and may be found at The following article has been submitted to/accepted by Journal of Applied Physics. Copyright (2013) Dong Lin, Chang Ye, Yiliang Liao, Sergey Suslov, Richard Liu and Gary J. Cheng. This article is distributed under a Creative Commons Attribution 3.0 Unported License.


This study investigates the fundamental mechanism of fatigue performance enhancement during a novel hybrid manufacturing process, which combines laser sintering of superhard nanoparticles integrated nanocomposites and laser shock peening (LSP). Through laser sintering, TiN nanoparticles are integrated uniformly into iron matrix to form a nanocomposite layer near the surface of AISI4140 steel. LSP is then performed on the nanocomposite layer to generate interaction between nanoparticles and shock waves. The fundamental mechanism of fatigue performance enhancement is discussed in this paper. During laser shock interaction with the nanocomposites, the existence of nanoparticles increases the dislocation density and also helps to pin the dislocation movement. As a result, both dislocation density and residual stress are stabilized, which is beneficial for fatigue performance. (C) 2013 American Institute of Physics. []


Nanoscience and Nanotechnology