AISI 310 stainless steel formed by gelcasting
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2018
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.
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Resumo
The gelcasting process is a liquid forming technique that allows the achievement of
compacts with high solids concentration and small amounts of binders. Although it was
developed almost 30 years ago for ceramic systems, its use in powder metallurgy is
rather incipient. Data related to mechanical properties of gelcast metallic samples are
scarce, particularly at high temperatures. This could possibly be attributed to the fact
that metallic particles are generally denser and larger than ceramic particles, leading
to fast sedimentation in liquid media. Nonetheless, the settling of particles can be
delayed by using a suspending agent, such as a water-soluble long chain polymer.
This work evaluates the microstructure and the yield strength under compression at
room temperature and at 800°C of vacuum sintered specimens prepared with HK-30
stainless steel powder (AISI 310, D50 = 10μm), manufactured by gelcasting process.
The microstructure analysis involved the measurement of grain size along the vertical
axis of cylindrical specimens, with special attention to the effect of particles settling,
and was conducted using scanning electron microscopy (SEM), optical microscopy,
and X-ray diffraction. All parts were vacuum sintered in a single batch at 1280°C, in
order to avoid the influence of this condition on the results. Particles settling before
gelation step can directly impact on mechanical properties, which would be an
undesired effect caused by compaction gradient. Yield strength was compared with
literature data of the same stainless steel, manufactured by casting. At room
temperature, specimens presented the same average yield strength as the same
stainless steel manufactured by casting, of 270 MPa. At 800°C, they presented 105
MPa of average yield strength. The settling effect was assessed considering the
position where the specimen was taken (from the top or the bottom of the cylinder
mold) and was negligible: both density and yield strength did not vary significantly
along the vertical axis. These results show that the gelcasting process can be used
with metal powders, even when the parts are big in height, provided that a suspending
agent is used to prevent particles settling.
Como referenciar
OLIVEIRA, L.F.R.; NEVES, M.D.; ORTEGA, F.S. AISI 310 stainless steel formed by gelcasting: an alternative manufacturing method. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... p. 6724-6724. Disponível em: http://repositorio.ipen.br/handle/123456789/29617. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.