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 introduced as a novel fabrication process for Ni-basedsuperalloy Rene88DT. The effect of heat treatment parameters of quenching rate and aging time onsize and distribution of γ′ precipitation was investigated. The heat treatment parameters were firstdetermined by DSC, and then optimized based on the examination of the microstructure andmechanical properties of heat treated LRF Rene88DT. The experimental results show that, theprecipitation of γ′ is inhomogeneously distributed as a result of uneven heat-cycle during LRF inas-deposited Rene88DT, resulting in low mechanical properties. After being heat treated at 1165°C,2h/AC + 760°C,28h/AC, γ ′ precipitation are homogeneously distributed with the size of 40~60nm,and the tensile strength of heat treated sample shows an increase of 400MPa as compared to that foras-deposited. The yield strength is close to that of the PM+HIP standard
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1051.pdf