Journal
JOURNAL OF MATERIALS SCIENCE
Volume 53, Issue 22, Pages 15650-15666Publisher
SPRINGER
DOI: 10.1007/s10853-018-2701-x
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Funding
- National Natural Science Foundation of China [51604227, 51501154, 51565041]
- National Key Research and Development Plan of China [2016YFB1100104]
- Fundamental Research Funds for the Central Universities of China [3102015BJ(II)ZS013, 3102017jg02013]
- Natural Science Foundation of Shaanxi Province of China [2017JM5052]
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This study investigated the evolution of solidification microstructure and dynamic recrystallisation (DRX) during the laser solid forming of the Ni-based Inconel 625 superalloy. The as-deposited microstructure mainly showed epitaxially grown columnar grains with fine equiaxed grains between them. These fine equiaxed grains were formed by the discontinuous DRX (DDRX) and continuous DRX (CDRX) processes, which were induced by the cyclic thermal stress resulting from the repeated laser deposition. The bulging of pre-existing grains and sub-grain rotation were the main mechanisms of the DDRX and CDRX phenomena, respectively. Additionally, after the occurrence of DRX, the dislocations were released and there was no distortion in the recrystallised grains. Coarse equiaxed grains were present in the top zone of the deposit; these grains were formed by the columnar-to-equiaxed transition during the solidification of the molten pool after the end of the laser re-melting and deposition process.
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