Effect of heat sink on microstructure of three-dimensional parts built by welding-based deposition
نویسندگان
چکیده
This paper concentrates on the microstructural analysis of the three-dimensional (3D) parts built by rapid prototyping (RP) based on gas tungsten arc welding (GTAW). The material used for building 3D parts is AISI 1018. Two sets of experiments are carried out. From each experiment, samples are obtained by a standard metallographical procedure: cross sectioning, polishing, and etching. During the first experiment, the temperature at the locations with different heat-transfer conditions are monitored by thermocouples. The relationships between the geometry of the deposited beads and the welding parameters are developed. The microstructure analysis of fusion and the heat-affected zone is performed. Samples from the second experiment are examined on Vickers microhardness tests. The results showed that the deposited layers possess a maximum hardness at the top layer with a slight decrease towards the middle and bottom layers. The obtained results show that 3D parts built in this manner have a very uniform microstructure and are free of cracks and porosity. # 2004 Elsevier Ltd. All rights reserved.
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