Journal
MATERIALS CHARACTERIZATION
Volume 125, Issue -, Pages 99-107Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2017.01.036
Keywords
Laser shock peening; AISI 304 stainless steel; Plastic deformation; Twin-twin intersection; Surface roughness; EBSD analysis
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Funding
- National Natural Science Foundation of China [51575242]
- Jiangsu Provincial Natural Science Foundation for Distinguished Young Scientists [BK20140012/BE2016148/BK20151341]
- Major programs of Natural Science Foundation of the Jiangsu Higher Education Institutions [14KJA460002]
- National Science Foundation of China for Post-doctoral Scientists [2015T80504]
- Six Major Talent Peak of Jiangsu Province [2014-ZBZZ-015]
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The effects of massive laser shock peening (LSP) treatment with different pulse energies on surface roughness and microstructural evolution in the surface layer of AISI304 stainless steel were investigated. The deformation -induced grain subdivision processes under two LSP treatment conditions of 3 and 6 J pulse energies were characterized and presented, respectively. Subsequently, EBSD characterization was conducted to analyze the peaks of misorientation angle for as-machined sample and LSPed samples with different pulse energies. Furthermore, a novel MT-MT intersection with four directions was found for the first time in the plastic deformation layer of AISI304 stainless steel, and the generation mechanism was completely presented according to the inherited crystal structure of austenite stainless steel. The formation process of the surface roughness and the formed microstructure subjected to massive LSP impact treatment with different pulse energies were compared and revealed. (C) 2017 Elsevier Inc. All rights reserved.
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