Banca de QUALIFICAÇÃO: HELEN RODRIGUES ARAÚJO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : HELEN RODRIGUES ARAÚJO
DATE: 06/11/2023
LOCAL: Qualificação por videoconferência
TITLE:

Production, characterization and evaluation of AISI H13 Friction Stir Welding tool by Laser Metal Deposition (LMD) Additive Manufacturing

KEY WORDS:

Additive Manufacturing; High performance tools; Laser Metal Deposition; Friction Stir Welding

PAGES: 113
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:

Additive manufacturing (AM) allows for improving the manufacturing of models with complex geometries, optimized properties, and difficult production by efficient production systems. Among the AM processes, laser-based additive production stands out, with applications that enable improvements in properties, high reproducibility index, low degree of delay, thermal transport, and controlled dilution, justifying the current high demand for these methods. In this context, the objective of this research is characterized, which aims to define optimized parameters for the application of the laser metal deposition additive process (LMD) for the production, from the AISI H13 additive material, of a non-consumable applications of the Friction Stir Welding (FSW) process for joining difficult-to-weld aeronautical aluminum alloys, analyzing the microstructural characteristics and mechanical behavior of the tool, investigating the effect of multiple depositions on these properties. To this end, an experiment plan using the response surface method was adopted to optimize the operating parameters of the LMD, such as laser power, scanning speed, and disk rotation (directly influencing the powder flow rate). Therefore, this work seeks to optimize the responses from deposits produced under different planning conditions to the total height of the deposited layers, roughness, and microhardness properties, in addition to the density of associated pores. Furthermore, we sought to carry out a morphological and metallurgical characterization of the H13 additive powder, using laser diffraction, XRF, and XRD techniques. The partial results of this research showed a martensitic matrix with the presence of austenite retained for the additive material. From the results of the experimental planning, it was possible to evaluate the established factors influences on the defined responses, revealing second-order interactions between the factors, in addition to demonstrating the great relevance of the parameters evaluated to determine these responses. From the composition of the response surfaces obtained, it was possible to establish optimized levels for these defined factors.

COMMITTEE MEMBERS:
Externo à Instituição - EDWAR ANDRÉS TORRES LÓPEZ
Interno - 2296912 - OSCAR OLIMPIO DE ARAUJO FILHO
Externo ao Programa - ***.000.000-** - SERGIO DE TRAGLIA AMANCIO FILHO - OUTRA
Presidente - 2154866 - TIAGO FELIPE DE ABREU SANTOS