An Integrated Approach towards Estimation of Build Profile and Mechanical Properties in LENS? Deposit of H13 Tool Steel

摘要

Laser engineered net shaping (LENS~?) pr℃ess facilitates manufacturing of parts byrnmelting and deposition of metallic powders layer by layer in an additive manner. An accuraternestimation of the layer-wise variations in the peak temperature and thermal cycle of the LENS?rnfabricated parts is prerequisite to estimate the part dimensions and its mechanical properties. Wernpresent here a three-dimensional heat transfer analysis based on finite element method torncompute the layer-wise variation in thermal cycle and build dimensions in a multi-layer singlelinernwall structure of H13 tool steel. The computed results are validated with the correspondingrnmeasured build profiles. It is observed that both cooling rate and hardness reduce from thernbottom towards the middle layers while tend to increase again towards the top layers. Furtherrnwork is in progress to estimate the layer-wise distribution of mechanical properties as function ofrnthe computed thermal cycles and solid-state phase transformations in multi-layered structures ofrnH13 tool steel.