Abstract :
GTD-111 directionally solidified superalloy
was repaired by the Nd:YAG laser based laserengineered
net shaping (LENS) process. Selection of
process parameters are discussed against the formation
of deposits and occurrence of defects. Formation of
microfissures, porosity, lack of fusion, and stray crystals
in the deposit zone was studied. It was identified that
formation of stray crystals in the directionally solidified
alloy could be due to two types of sources: the shape of
the melt pool, and the existence of second-phase
particles at the melt pool fusion boundary.
