期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 527, 期 18-19, 页码 4823-4829出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.04.062
关键词
Laser melting deposition; Superalloy; Rene'41; Microstructure; Mechanical properties
类别
资金
- National Natural Science Foundation of China [50625413]
- Ministry of Education [IRT0805]
- National High-Tech Research and Development Program [2007AA041904]
- State Key Development Program for Basic Research of China [2006CB605206, 2010CB731705]
Ni-base superalloy Rene'41 was produced by the laser melting deposition (LMD) manufacturing process. The microstructure was characterized by optical and scanning electron microscopy and X-ray diffraction. Results showed that ultra-fine rapid directionally solidified columnar grains with some fine MC carbide particles in the interdendritic zone were formed in the as-deposited samples along the deposited-direction due to the high thermal gradient and solidification cooling rate. The columnar grains were composed of well oriented cellular dendrites with a primary arm spacing of approximately 35 mu m. The size of gamma' precipitates in the dendritic cores was larger than that in the interdendritic zones. Mechanical test data have shown that the LMD material had good high-temperature mechanical properties along longitudinal section. (C) 2010 Elsevier B.V. All rights reserved.
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