Microstructure and mechanical properties of rapid solidified ultra-fine columnar grain Ni-base superalloy DZ408 by laser melting deposition manufacturing

被引：0
|
作者：
Jiang, Hua [1 ]
Tang, Haibo [1 ]
Fang, Yanli [1 ]
Wang, Huaming [1 ]
机构：
[1] Eng. Res. Cent. of Ministry of Education on Laser Direct Manufacturing for Large Metallic Components, Beihang University
来源：
Zhongguo Jiguang/Chinese Journal of Lasers | 2012年 / 39卷 / 02期
关键词：
Directional rapid solidification; DZ408; Laser melting deposition; Laser technique; Microstructure; Room temperature tensile properties;
D O I：
10.3788/CJL201239.0203004
中图分类号：
学科分类号：
摘要：
Directionally rapid solidified Ni-base superalloy DZ408 with ultra-fine columnar grain structure is produced by the laser melting deposition (LMD) manufacturing process. Microstructure and mechanical properties of the laser melting deposited DZ408 before and after heat treatment are analyzed and tested. Results show that as-deposited microstructure is directionally solidified dendrites with the primary dendrite arm spacing of approximately 26 μm and the secondary dendrite arm spacing of approximately 8 μm . The size of γ' in the interdendritic zones is larger than that in the dendritic cores. The undirectional columnar layer and interdendritic shrinkage should be sufficient remelted to ensure the densification and epitaxy between the depositing layer and the previous one. After proper heat treatment, the room temperature tensile strength of the DZ408 superalloy is 1507 MPa, while the elongation along the deposition direction is 14.5%.
引用
收藏
相关论文
共 18 条
  • [1] Hu Z., Wang H., Zhang J., Et al., Nonequilibrium solidification of single crystal nickel-base superalloy, Corrosion Science and Protection Technology, 1, pp. 15-22, (1993)
  • [2] Yu J., Sun X., Guan H., Et al., Influence of heat treatment on the microstructure and mechanical properties of DZ951 alloy, Rare Metals, 27, 2, pp. 216-222, (2008)
  • [3] Chen J., Experimental research on formation of laser sintering WC particles reinforced Ni-base alloy bulk, Chinese J. Lasers, 37, 3, pp. 868-872, (2010)
  • [4] Wang H., Zhang L., Li A., Et al., Progress on laser melting deposition processing and manufacturing of advanced aeronautical metallic structural materials and coatings, Heat Treatment of Metals, 33, 1, pp. 82-85, (2008)
  • [5] Feng L., Huang W., Lin X., Et al., FGH95 superalloy laser metal forming directional solidification, The Chinese Journal of Nonferrous Metals, 13, 1, pp. 181-187, (2003)
  • [6] Liu D., Zhang S., Li A., Et al., Microstructure and tensile properties of laser melting deposited TiC/TA15 titanium matrix composites, J. Alloys & Compounds, 485, 1-2, pp. 156-162, (2009)
  • [7] Chen J., Xue L., Process-induced microstructural characteristics of laser consolidated IN-738 superalloy, Mater. Sci. Engng. A, 527, 27-28, pp. 7318-7328, (2010)
  • [8] Zhang Y., Huang C., Wu F., Et al., Microstructure and mechanical properties of laser direct deposited γ-TiAl alloy, Chinese J. Lasers, 37, 10, pp. 2684-2688, (2010)
  • [9] Chen J., Zhang F., Tan H., Et al., Alloying mechanics in moving melt pool during laser solid forming from blended elemental powders, Chinese J. Lasers, 37, 8, pp. 2154-2159, (2010)
  • [10] Tan Y., Huang Z., Jia X., Et al., Study on a directionally solidified superalloy DZ408 (DZ8), Eleventh Annual Meeting of Chinese High-Temperature Alloys Proceedings, pp. 389-391, (2007)
12