Banca de DEFESA: LUCAS PEREIRA DE JESUS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUCAS PEREIRA DE JESUS
DATA : 22/08/2022
HORA: 14:00
LOCAL: Google Meet
TÍTULO:

QUANTIFICAÇÃO DE AUSTENITA RETIDA EM AÇOS ATRAVÉS DE UM MÉTODO MAGNÉTICO NÃO DESTRUTIVO

PALAVRAS-CHAVES:

Austenite, Martensitic Steels, Eletromagnetic Balance, Quantification,
Quenching and Tempering

PÁGINAS: 95
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
RESUMO:

This research project aims to develop new equipment for quantification of retained
austenite in heat-treated martensitic steels, in a fast and non-destructive way: a
balance that relates the magnetic response of a specimen, with the quantity of phase
present. The higher the percentage of retained austenite there is in the steel, the less
will be its magnetic response. The device was developed using low-cost material, and
simplified construction allocated over an electromagnetic plate. To authenticate the
equipment was manufactured and head treated square section specimens with 20 x
20 mm using SAE 5160 steel, with different thicknesses and heat treatment
temperatures, i.e., raw, quenched, quenched and tempered, and quenched and double
tempered, with the purpose to get different retained austenite fractions. Also, were
selected parts manufactured by a factory, to test the equipment with parts with different
sections. The specimens and parts were quantified on the conventional method to
obtain retained austenite fraction (x-ray diffraction, quantitative metallography, and
feritoscope) and then in the device developed in this project. To analyze the results
was utilized the analysis of variance method (ANOVA), using the design of the
experiment in randomized blocks. The electromagnetic balance is quantified in a fast
and effective way with the square section specimens, regardless of their thickness,
according to ANOVA analysis, the percentage of retained austenite acquired does not
differs statistically from the results obtained with the conventional methods. In the end,
the aim of this study, to develop equipment that applies a non-destructive quantification,
was not reached, because the equipment only worked in specimens with square
sections. So, for the next research, there is a need to improve the device so that it
works in other geometry situations.

MEMBROS DA BANCA:
Interno - 1997577 - ALEXANDRE LUIS GASPARIN
Externo à Instituição - RAFAEL GUSTAVO SCHREIBER - CEFET-SC
Externo à Instituição - CAMILA DOS SANTOS TORRES - UFSM