Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 570, Issue -, Pages 82-86Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.01.068
Keywords
Pearlitic steels; Ultrafine grained microstructure; Equal channel angular pressing; Laser shock processing; Residual stress; Microhardness
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Funding
- National Natural Science Foundation of China [50801021]
- Program for Young Key Teachers in Henan Province [2011GGJS-070]
- National Natural Science Foundation
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Ultrafine micro-duplex structure (ferrite (alpha)+ cementite (theta)) formed in a pearlitic Fe-0.8C steel after four passes of equal channel angular pressing (ECAP) at 923 K via route Bc. Subsequently the surface of the ultra-micro-duplex structure was treated by multiple laser shock processing (LSP) impacts with different laser pulse energies. The microstructure was obviously refined due to the ultra-high plastic strain induced by LSP. The lattice parameter of alpha-Fe increased with the laser pulse energy, indicating that the cementite dissolution was enhanced. In addition, residual stress and microhardness increased with the LSP pulse energy. (C) 2013 Elsevier B.V. All rights reserved.
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