Research On Thermal Behavior During Laser Titanium Alloy Deposition Forming Processing

Laser metal deposition forming(LMDF) is a new developing technology on the basis oflaser cladding and rapid prototyping in recent years. In LMDF, the substrate and the metallicpowder are melt synchronously by laser beam and forming metallurgical combination, thenthe compact part with regular figures is manufactured layer by layer on the substrate. LMDFhas many special advantages, such as high integration and production efficiency, wide rangeof processing materials, none environment pollution and so on. So people pay close attentionto the LMDF.In this paper, it has been numerical simulation the thermal behaviour of titanium alloylaser which deposition forming processing and analysis of the temperature field and stressfield distribution law. This is really meaningful for LMDF.In this paper, though to use ABAQUS finite element software to be the thermal field andstress field of laser titanium powder deposition which were dynamically simulated，elaboratethe interactions among laser, metal powder and substrate. Complete the following content:1．Established the mathematical model and the finite element model of laser metaldeposition forming process. Respectively analysis the laser metal deposition formingsimulated heat source model, heat transfer model, boundary conditions and stress-strainrelationship.2．Established the ways to single-channel titanium alloy laser deposition forming processof the temperature field and stress field of finite element simulation method. And calculate thesingle laser powder deposition forming process of the temperature field and stress fieldsimulately. At the same time analyzed the temperature field and stress field of distribution.3．Established numerical simulation model of multi-channel titanium alloy laser powderdeposition.Meanwell considering ideal lap rate case facies in morphology when establishingmodel. And studied the model which formed on processing of temperature field, temperaturegradient and residual stress of forming distribution.4．Finally, based on the present laser rapid forming system in laboratory，I made the tests for metal titanium laser deposition forming observe the specimen morphology and verifiedthrough experiment to set up in the paper 3D laser forming process temperature field ofsedimentary dynamic model.Through numerical simulation and actual experiment, obtained a group of the optimaltechnological parameters to guide the subsequent simulation and actual production.