Microstructure and Mechanical Properties of Superalloy Laser Welded Joints for GH3625 Fabricated by Laser Additive [激光增材制造GH3625高温合金激光焊接头组织及力学性能]

作者：Geng Z.; Wang S.^*; Chen Y.; Huang Y.; Xin J.; Ke L.; Wen T.; Sun W.

来源：Rare Metal Materials and Engineering, 2020, 49(7): 2480-2487.

• GH3625 superalloy fabricated by laser additive
• Laser welding
• Mechanical properties
• Microstructure evolution

The laser butt welding of GH3625 superalloy fabricated by laser additive was conducted. The microstructure evolution and mechanical properties of the welded joints were analyzed. The results show that a great amount of Laves phase is only precipitated at the grain boundary of upper layer in HAZ, resulting in significant coarsening of the grain boundary. Along the upper layer to the lower layer of the weld, the fusion zone and the intermediate zone are gradually transformed from cell crystal, the columnar crystal and the equiaxed fine crystal of the upper layer to columnar crystal of the lower layer. The number of equiaxed fine crystal growing close to the fusion line is gradually increased. And the central zone is dendritic. The particle of fine γ' phase is precipitated in the weld. A number of Laves phase is precipitated in the inter-dendritic of the intermediate zone, and the morphology gradually changes from the strip of the upper layer to the particle of the lower layer. The tensile strength of the welded joint is 872 MPa, which is up to 98.2% of the base metal. The elongation is up to 90.7% of the base metal, the fracture surface of weld joint is approximately 45° inclined plane, and the fracture mode is the mixed fracture mode of brittle and ductile.