Journal
OPTICS AND LASER TECHNOLOGY
Volume 45, Issue -, Pages 330-335Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2012.06.028
Keywords
Laser solid forming; Microstructure; Micro-segregation
Categories
Funding
- National Natural Science Foundation of China (NSFC) [50971102]
- National Basic Research Program of China [2007CB613805]
- NPU Foundation for Fundamental Research [NPU-FFR-JC200808]
- State Key Laboratory of Solidification Processing (NPU) [16-TZ-2007, 39-QZ-2009]
- Program of Introducing Talents of Discipline to Universities [08040]
- Key Laboratory of Nondestructive Testing (Nanchang Hangkong University), Ministry of Education [ZD200629005]
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The microstructure variation of as-deposited Inconel 718 superalloy sample in deposition direction fabricated by laser solid forming (LSF) was investigated. It was found that the as-deposited microstructure was mainly consisted of predominant gamma columnar dendrites directionally growing along the deposition direction. Primary dendrite arm space measurement revealed spaces of 11.5, 17.5 and 38.0 mu m at the bottom, the middle and the top section of the LSF sample respectively. The result was further studied by comparing with the Kurz-Giovanola-Trivedi (KGT) dendrite growth model, which was in a reasonable agreement with the experimental result. The various microstructures and micro-segregation situations at different sections of the LSF sample, which were induced by the thermal accumulation during LSF process, were also carefully discussed. (C) 2012 Elsevier Ltd. All rights reserved.
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