IN625 Multilayers Characterization Deposited by CMT

Abstract

Additive manufacturing is a process used to build parts with geometric complexity, and repair technical components with high value added. The additive manufacturing has the advantage the capacity of producing components with complex geometry and less waste of material, fact which becomes attractive when working with high costs materials. In this multilayer deposition, process produces 3D mechanical structures following digital models. The success of each procedure depends of the processing of parameters, which is included technique of deposition, parameters, alloy to be deposited and conditions of deposition. Control the impacts of these parameters is determinant to obtain another advantage of this process that is the short time between the project development and the parts production. Many studies have been developed to evaluate the effects of the multilayers on the component. This study contributes to this discussion processing the Ni superalloy IN625 by GMAW-CMT (Cold Metal Transfer) process. Processed multilayers walls with 15 cm high were characterized as-deposited condition and after heat treatment. The impact of the multilayers on the microstructure and mechanical properties were evaluated by hardness and tensile test. The effects of the heat treatment on the mechanical properties are discussed. Results show that the heat treatment minimizes heterogeneities of the multilayer structure. After the heat treatment, occurred a decrease of ductility when compared to the wall as processed condition, besides that, exhibited a higher yield strength and tensile strength. The uniformity of the structure after heat treatment is confirmed by the lower dispersion of the results. Analysis of the fracture region contributed to a better understanding of the effects of multilayer deposition and subsequent heat treatment.

Key-words:
Additive manufacturing; IN625; Multilayers