Study on Heat Treatment Process of Laser Additive Manufacturing and Connecting GH4169 Alloy
The base metal samples of GH4169 alloy were prepared by laser additive manufacturing technology,and the laser additive connection of the base metal was realized by using the same process parameters.The tensile properties of the alloy under different heat treatment conditions were tested,and the mechanism of property change was analyzed.The results show that with the advantage of small heat affected zone of laser additive manufacturing technology,the microstructure evolution of base metal and connection zone is basically the same during the heat treatment process.The as-deposited alloy has a typical columnar structure,and the secondary dendrites are not developed,γ+Laves eutectic phase is distributed along the grain boundary.After homogenization+solution-treatment,Laves phase dissolves back into the matrix,accompanied by the coarsening of columnar crystals.The distribution of Laves phase changes when double aging treatment is carried out.The tensile properties of samples with different heat treatment processes are higher than that of the as-cast alloy.The change of Laves phase content and distribution states after heat treatment is the main factor affecting its strength and plasticity.
GH4169 alloylaser additive manufacturingmicrostructuretensile propertiesheat treatment process
NETL
NSTL
万方数据
