Discrete element modeling of powder metallurgy processes

Nosewicz, S.

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Tytuł artykułu

Discrete element modeling of powder metallurgy processes

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Nosewicz S.

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IPPT_Reports_2016_5_Szymon_Nosewicz_online_21_November_2016.pdf

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Abstrakty

The proposed doctoral dissertation presents a numerical and experimental analysis of manufacturing of new materials by powder metallurgy techniques. The scope of the thesis includes three main parts: • formulation of an original numerical model of powder metallurgy, • simulations of hot pressing for dierent combinations of process parameters, • verication of the numerical model based on own experimental results. The main part of the doctoral dissertation is dedicated to the theoretical and numerical investigations. An original numerical model of a powder metallurgy process has been formulated and implemented within the discrete element framework. The proposed model allows to study the motion (shrinkage and rearrangement) of powder particles during compaction and sintering stage and takes into account the growth of cohesive necks. In order to verify, calibrate and validate the numerical model, several simulations of hot pressing and sintering process have been performed. Numerical results have shown the correct representation of the density, shrinkage and densication rate of sintered specimens for dierent combination of process parameters. Validation of numerical model has been brought by performance of own experimental studies, which refers to manufacture the intermetallic NiAl, ceramic Al₂O₃ and NiAl-Al₂O₃ composite specimens and characterization of its mechanical and microstructural properties. Further numerical studies have comprised evaluation of micro- and macroscopic stresses during and after powder metallurgy process. The results presented in this thesis have shown that the developed original discrete element model is an eective and suitable tool to analysis phenomenon occurring during the powder metallurgy process. Numerical model allows to study the material mechanism both at microscopic (such as a rearrangement and interaction of powder particles) and macroscopic scale (such as shrinkage, material densication or macroscopic stress). Presented results allow to the conclude that the new discrete element model can be applied to development and optimization of powder metallurgy processes.

Niniejsza rozprawa doktorska przedstawia numeryczną oraz doświadczalną analizą procesu wytwarzania materiałów technikami metalurgii proszków. Zakres pracy badawczej obejmuje trzy główne punkty: • opracowanie oryginalnego modelu procesów metalurgii proszków, • symulacje jednoosiowego prasowania na gorąco przy różnych kombinacjach parametrów procesu, • weryfikację modelu numerycznego za pomocą własnych badań doświadczalnych. Główną częścią rozprawy są badania o charakterze teoretycznym i numerycznym. W ramach pracy doktorskiej został opracowany oraz zaimplementowany oryginalny model elementów dyskretnych. W celu weryfikacji, kalibracji oraz walidacji modelu numerycznego przeprowadzono szereg symulacji numerycznych. Wyniki z symulacji wskazuj¡ na prawidłowe działanie modelu, poprawne odwzorowanie prędkości zagęszczania i skurczu próbki.Walidacja modelu numerycznego została przeprowadzona za pomocą własnych badań eksperymentalnych, które polegały na wytworzeniu szeregu próbek intermetalicznych NiAl, ceramicznych Al₂O₃ oraz kompozytowych NiAl/Al₂O₃ wraz z charakteryzacją właściwości mechanicznych i mikrostrukturalnych. Dalsze badania numeryczne dotyczy ły analizy naprężeń generowanych w czasie procesu spiekania oraz naprężeń resztkowych po procesie wytwarzania. Wyniki zawarte w niniejszej rozprawie doktorskiej pokazują, że opracowany w ramach metody elementów dyskretnych model jest efektywnym narzędziem do modelowania procesu metalurgii proszków. Pozwala badać mechanizmy procesu na poziomie zarówno mikro- (przegrupowanie i oddziaływanie ziaren w trakcie prasowania i spiekania) jak i makroskopowym (skurcz, zagęszczanie materiału oraz naprężenia makroskopowe). Na tej podstawie mo»na stwierdzić, że przedstawiony model może być wykorzystywany do projektowania i optymalizacji procesów metalurgii proszków.

Słowa kluczowe

powder metallurgy numerical analysis

metalurgia proszków analiza numeryczna

Wydawca

Instytut Podstawowych Problemów Techniki PAN

Czasopismo

IPPT Reports on Fundamental Technological Research

Rocznik

2016

Tom

nr 5

Strony

1--183

Opis fizyczny

Bibliogr. 245 poz., rys., tab.

Twórcy

autor

Nosewicz S.

Instytut Podstawowych Problemów Techniki Polskiej Akademii Nauk

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