ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Laser rapid forming (LRF) is a new manufacturing technology, which has beendeveloped on the basis of multi-layer laser cladding. In the LRF process, the microstructure hasimportant effects on the mechanical properties of the parts[removed info]but the control of microstructure is aproblem. In this study, the influences of crystallography orientations of substrate and profile ofsolid/liquid interface on microstructure were discussed. Further, with the combining of thecolumnar to equiaxed transition (CET) model during alloy solidification, the growth law ofmicrostructure of Rene88DT alloy was established. It has been found that the temperature gradientwas lowest and the solidification velocity was greatest at the solid/liquid interface of the tail ofmolten pool, and hence the CET occurs easily at this position. The temperature measurementsystem of molten pool was developed by using a two-color infrared thermometer in this study. Withthe measurement of temperature gradient of the tail of molten pool by using a two-color infraredthermometer, the process parameters of laser multi-layer cladding were optimized. Finally,directional solidification even single crystal was achieved in laser multi-layer cladding
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2301.pdf
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