METHOD OF CLADDING, ADDITIVE MANUFACTURING AND FUSION WELDING OF SUPERALLOYS AND MATERIALF OR THE SAME

摘要

The present concept is a method of substantially crack-free cladding, fusion welding and additive manufacturing of superalloys. The method involves the application of a high temperature pre-alloyed filler powder that includes melting point depressants, to a superalloy base material. The base material and pre-alloyed filler powder are heated to a temperature that will fully melt the pre-alloyed filler powder and also melt a surface layer of the base material, thereby forming a weld pool. Upon solidification and cooling of the weld pool, there is coalescence between a weld bead and the base material thereby forming the weld bead which is substantially crack-free. The high temperature pre-alloyed filler powder consists in wt % of the following chemical elements: Co 9-15%; Al 3-6.5%; C 0.1-0.2%; Ti, Zr and Hf with a total content from 1 to 8.5%; Ta and Nb with a total content from 0.5 to 8.5%; W and Mo with a total content from 7 to 20%; Cr and Re with a total content from 6.5 to 18.5%; Fe and Mn with a total content from 0.1 to 1%; B 0.1-0.6% with Ni and impurities to balance.

主权项

1. A method of substantially crack-free cladding, fusion welding and additive manufacturing of superalloys comprises the steps of:
a) application of a high temperature pre-alloyed filler powder that includes melting point depressants, to a superalloy base material; b) simultaneous heating of the base material and the pre-alloyed filler powder by a welding heat source that is movable relative to the base material, to a temperature that will fully melt the pre-alloyed filler powder and also melt a surface layer of the base material, thereby forming a weld pool; c) such that upon solidification and cooling of the weld pool, there is coalescence between a weld bead and the base material thereby forming the weld bead which is substantially crack-free.