SIMULATION OF HOT ISOSTATIC PRESSING OF METAL-POWDER COMPONENTS TO NEAR NET SHAPE

Presents a finite element formulation of hot isostatic pressing (HIP) based on a continuum approach using thermal-elastoviscoplastic constit utive equations with compressibility. The formulation takes into consi deration dependence of the viscoplastic part on the porosity. Also tak es into account the thermomechanical response, including nonlinear eff ects in both the thermal and mechanical analyses. Implements the mater ial model in an implicit finite element code. Presents experimental pr ocedures for evaluating the inelastic behaviour of metal powders durin g densification and experimental data. Chooses the simulation of the d ilatometer measurement of a cylindrical component during HIP and manuf acturing simulation of a turbine component to near net shape (NNS) as a demonstrator example. Both components are made of a hot isostaticall y pressed hot-w orking martensitic steel. Compares the result of the s imulation in the form of the final geometry of the container with the geometry of a real component produced by HIP. Makes a comparison betwe en the calculated and measured deformations during the HIP process for the cylindrical component. Measures the final geometry of the turbine component by means of a computer controlled measuring machine (CMM). Performs the complete process from design and simulation to geometry v erification within a computer-aided concurrent engineering (CAGE) syst em.