期刊
METALS AND MATERIALS INTERNATIONAL
卷 23, 期 6, 页码 1063-1074出版社
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-017-6832-4
关键词
alloys; oxide dispersion strengthened steel; powder processing; microstructure; scanning/transmission electron microscopy
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2015R1C1A1A02036622]
- National Research Foundation of Korea [2015R1C1A1A02036622] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigated the feasibility of a direct energy deposition process for fabrication of oxide dispersion strengthened steel cladding. The effect of the laser working power and scan speed on the microstructural stability of oxide nanoparticles in the deposition layer was examined. Y-Ti-O type oxide nanoparticles with a mean diameter of 45 nm were successfully dispersed by the laser deposition process. The laser working power significantly affected nanoparticle size and number density. A high laser power with a low scan speed seriously induced particle coarsening and agglomeration. Compared with bulk oxide dispersion strengthened steel, the hardness of the laser deposition layer was much lower because of a relatively coarse particle and grain size. Formation mechanism of nanoparticles during laser deposition was discussed.
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