Microstructure features of Ni-based and Ti-based alloys formed by method of wire-feed electron beam additive technology

Abstract

In the present study, a microstructural investigation of wire-feed EBAM-manufactured nickel-based and titanium-based alloys were conducted by producing single wall sample with 16 and 19 vertical layers, respectively. It was shown that in obtained material microstructural and elemental gradient presents. The results of the research show that dendrites and grains grow epitaxial in the direction of temperature gradient. Non-directional dissipation of heat on the edge of the sample leads to formation of equiaxed structure. Chosen parameters allow to produce low-defective samples by EBAM technology.

Predicting the Strength of EBAM 3D Printed Ti-6Al-4V from Processing Conditions

“…Variations in thermal experiences and processing conditions result in microstructural gradients, making the science of predicting the material properties and resulting residual stresses a complex multiphysics simulation problem. One method to experimentally determine the material properties involves the use of destructive testing procedures in order to observe the microstructures associated with specific print geometries and processing parameters [7,[17][18][19]. However, destructive testing is costly in both time and resources and negates the improved life-cycle benefits of AM.…”