Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 747, Issue -, Pages 255-265Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.02.353
Keywords
Laser shock peening; Wire-arc additive manufacturing; Microstructure; Residual stress; Tensile properties
Categories
Funding
- National International Collaborative Science and Technology Research Project China [2013DFR50590]
- Civil aircraft special research projects [MJ-2016-F-16]
- National Natural Science Foundation of China [11372019]
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Wire-arc additive manufacturing can fabricate components with complex geometries efficiently compared with other manufacturing methods. However, the uncontrolled grain size and tensile residual stress in as-fabricated components have limited their applications. In this study, laser shock peening, an innovative surface treatment technique, was specially-combined with wire-arc additive manufacturing to refine microstructure, modify stress state and enhance tensile properties of as-printed 2319 aluminum alloy. After peening, the average grain size decreased from 59.7 mu m to 46.7 mu m, and the percentage of grains with low angle boundaries increased from 34% to 70%. High density of dislocations and mechanical twins were generated and resulted in the increase of micro-hardness. Residual stresses were modified from tensile to compressive state with a maximum value around 100 MPa. Yield strength was remarkably increased by 72%. This combined printing and peening manufacturing strategy provides microstructure and quality control of manufactured components for practical applications. (c) 2018 Elsevier B.V. All rights reserved.
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