NiTi alloy has excellent biocompatibility. This paper presents a novel technology of direct shaping of this promising
biomaterial with selective laser melting (SLM). The frequently encountered defects of the SLM metal alloy parts such as
non-fully melting, thermal deformation and balling were analyzed theoretically and experimentally, and the
microstructure of the parts was analyzed on microscope. The results show that an appropriate selection of laser mode and
scanning strategy assures a satisfying quality of the final parts; they also reveal that the SLM technology can be expected
as a potential technology to directly manufacture the artificial implant of NiTi alloys.
The coupled numerical simulation on fluid flow, heat transfer and mass transfer in the process of laser cladding was
undertaken on the basis of the continuum model. In the simulation of mass transfer in the laser molten pool, the
concentration distribution in the regions on different sides of the interface between cladding layer and the substrate was
calculated separately and coupled at the co-boundary. The non-equilibrium solute partition coefficient was obtained from
equilibrium solute partition coefficient according to the Sobolev model. By using the developed software, the
distribution of Fe in laser molten pool in an experiment of cladding Stellite 6 on 12CrMoV was calculated. The obtained
results well coincide with the experimental ones.