Evaluation of the microstructure, mechanical properties and solidification texture of Inconel 625 on Inconel 738 substrate by direct laser deposition

In this research, additive manufacturing of IN625 on IN738 substrate was investigated by a cubic sample with dimensions of 2*2 cm2 with a unidirectional pattern. The purpose of manufacturing this sample; was to check the part microstructure, mechanical properties, and texture. To check the properties, electron and optical microscopes, and diffractometers equipped with goniometer were used. The results showed that the texture of grains is from the molten pool towards the substrate (in the direction of heat transfer). The SEM images showed that the columnar dendrites in the upper layers of the sample are larger than the columnar dendrites in the middle areas along with the secondary arm. Examination of the polfigure showed a Goss texture component ({011} >100) besides to a weak cubic component ({001} >100). The increase in length was 990, 563 MPa and 48% for the direction parallel to the tension axis.