@PhDThesis{Alves:2016:CaMeEs,
author = "Alves, Eder Paduan",
title = "Caracteriza{\c{c}}{\~a}o mec{\^a}nica e estudo do perfil
t{\'e}rmico na soldagem por fric{\c{c}}{\~a}o rotativa de
materiais dissimilares",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2016",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2016-02-18",
keywords = "soldagem por fric{\c{c}}{\~a}o, an{\'a}lise t{\'e}rmica,
materiais dissimilares, propriedades mec{\^a}nicas, an{\'a}lise
microestrutural, friction welding, thermal analysis, dissimilar
materials, mechanical properties, microstructural analysis.",
abstract = "Na busca de processos alternativos utilizados para uni{\~a}o de
materiais dissimilares, destaca-se o processo de soldagem por
fric{\c{c}}{\~a}o rotativa (Rotary Friction Welding), utilizado
em tecnologia de ponta na ind{\'u}stria aeroespacial,
aeron{\'a}utica, nuclear, b{\'e}lica e automotiva. O processo de
soldagem por fric{\c{c}}{\~a}o rotativa (SFR) acontece no estado
s{\'o}lido sem ocorr{\^e}ncia de fus{\~a}o entre as partes, e
apresenta como principais mecanismos a difus{\~a}o e mistura
mec{\^a}nica. Este trabalho tem como objetivo a
caracteriza{\c{c}}{\~a}o mec{\^a}nica, microestrutural, e
estudo do perfil t{\'e}rmico de jun{\c{c}}{\~o}es dissimilares
envolvendo a liga de alum{\'{\i}}nio AA 6351-T6 e o a{\c{c}}o
inoxid{\'a}vel AISI 304L produzidos comercialmente no Brasil,
para aplica{\c{c}}{\~o}es no setor aeroespacial.
Jun{\c{c}}{\~o}es dissimilares foram obtidas utilizando
diferentes geometrias e caracterizadas por meio de ensaios de
tra{\c{c}}{\~a}o, microdureza Vickers (HV), microscopia
{\'o}ptica e eletr{\^o}nica (MEV, EDX), espectroscopia de
fotoel{\'e}trons por RX (XPS), e tiveram o seu perfil
t{\'e}rmico estudados a partir de trabalhos experimentais de
monitoramento da temperatura em tempo real com aux{\'{\i}}lio de
termoc{\^a}mera, sistemas de termopares, e modelamento
anal{\'{\i}}tico 1D. Resultados dos ensaios mec{\^a}nicos
mostraram a grande efici{\^e}ncia do processo na
fabrica{\c{c}}{\~a}o de jun{\c{c}}{\~o}es dissimilares
estruturais para aplica{\c{c}}{\~o}es na engenharia.
Jun{\c{c}}{\~o}es produzidas a partir de pinos com geometria
c{\^o}nica apresentaram maior resist{\^e}ncia mec{\^a}nica em
todos os testes realizados. Nas an{\'a}lises microestruturais e
por XPS ficou caracterizada a interdifus{\~a}o entre os
principais elementos presentes nos materiais envolvidos no
processo. Amostras de jun{\c{c}}{\~o}es que tiveram a ruptura na
interface de liga{\c{c}}{\~a}o foram analisadas e verificou-se
que porcentagens elevadas de Fe combinadas a baixas porcentagens
de Ni, melhoram a resist{\^e}ncia mec{\^a}nica da
jun{\c{c}}{\~a}o. O uso de termoc{\^a}mera e sistema de
termopares no monitoramento da temperatura durante o processo
possibilitou a visualiza{\c{c}}{\~a}o em tempo real dos
diferentes gradientes de temperatura na interface de
liga{\c{c}}{\~a}o tanto no sentido radial quanto longitudinal.
Nas amostra onde se utilizou pinos com geometria c{\^o}nica
ocorreu melhor distribui{\c{c}}{\~a}o da temperatura na
interface de liga{\c{c}}{\~a}o, com maior eleva{\c{c}}{\~a}o
na regi{\~a}o central da amostra nos tr{\^e}s segundos iniciais
do processo. Valores num{\'e}ricos obtidos a partir do
modelamento matem{\'a}tico em 1D apresentaram grande
aproxima{\c{c}}{\~a}o quando comparados com os dados obtidos
experimentalmente. ABSTRACT: In search of alternative processes
utilized for joining dissimilar materials, one of the most
relevant process is rotary friction welding, which is being used
in hightechnology applications in aerospace industry, aeronautics,
nuclear, military and automotive. The rotary friction welding
process (RFW) happens in the solid state without occurrence of
fusion between the parties, and presents as the main binding
mechanisms the diffusion and mechanical mixture. This work has
like objective the mechanical and microstructural
characterization, and study of the thermal profile of dissimilar
joints involving aluminium alloy AA 6351-T6 and stainless steel
AISI 304L commercially produced in Brazil, for applications in the
aerospace sector. Dissimilar joints were obtained using different
geometries and characterized by means of traction mechanical
essays, Vickers microhardness (HV), optical and electronic
microscopy (SEM, EDX), X-ray photoelectron spectroscopy (XPS), and
had its thermal profile studied from experimental works of real
time temperature monitoring with the aid of termoc{\^a}mera,
thermocouples, and 1D analytical modeling. Results of mechanical
tests showed the great efficiency of the manufacturing process of
dissimilar joints for structural engineering applications. Joints
produced from pin with conical geometry presented a higher
mechanical strength in all tests. In the micro-structural analysis
and XPS was characterized the interdiffusion between the main
components of the materials involved in the process. Samples of
joints that had the rupture in the bonding interface was analyzed
and it was found that high percentages of Fe combined at low
percentages of Ni, improve the mechanical resistance of the
junction. The use of termoc{\^a}mera and system of thermocouples
in temperature monitoring during the process enabled the realtime
visualization of different temperature gradients in the bonding
interface both in radial and longitudinal direction. In samples
where used pins with conical geometry occurred better temperature
distribution on the interface, with the highest elevation in the
central region of the sample within three seconds of the process.
Numeric values obtained from the mathematical modeling in 1D
presented great approach when compared with the data obtained
experimentally.",
committee = "An, Chen Ying (presidente / orientador) and Toledo, Rafael Cardoso
( orientador) and Piorino Neto, Francisco (orientador) and
Mineiro, S{\'e}rgio Luiz and Travelho, Jer{\^o}nimo dos Santos
and Santos, Eduardo Ferro dos and Dollinger, Christian Frederico
de {\'A}vila Von",
copyholder = "SID/SCD",
englishtitle = "Mechanical characterization and study of the thermal profile
during rotary friction welding of dissimilar materials",
language = "pt",
pages = "208",
ibi = "8JMKD3MGP3W34P/3LBKP3B",
url = "http://urlib.net/ibi/8JMKD3MGP3W34P/3LBKP3B",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}