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SUMMARY:Efficient modeling of very large NNS parts (up to 3 meter diameter
 ) and key parameters to control dimensional scattering in a +- 15 mm range
 .
DTSTART;VALUE=DATE-TIME:20171208T030000Z
DTEND;VALUE=DATE-TIME:20171208T033500Z
DTSTAMP;VALUE=DATE-TIME:20260513T215904Z
UID:indico-contribution-284-1019@events01.synchrotron.org.au
DESCRIPTION:Speakers: Gerard RAISSON (Consultant)\nThe paper addresses the
  challenging scientific and technological tasks of achieving limitation of
  over thickness to 1% of a linear dimension in HIPing Near Net shape PM Co
 mponents of large size up to 3 meter diameter. To reach this goal it is ne
 cessary to increase precision of modeling which has to include thermal con
 ductivity for large (thick) parts\, especially influential at the initial 
 stage of densification. This sounds obvious\, but our analysis shows that 
 rather than to work on constitutive equations and numerical procedures\, i
 t is more efficient to improve the material data base constituency and mor
 e particularly for the first step of HIP cycle which controls heat conduct
 ivity and the initial deformation pattern. In particular\, it is shown tha
 t the initial (tap) density of powder in the capsule determines not only t
 he integral shrinkage but also all following  deformation pattern.\nIndepe
 ndently of modeling\, it is necessary to control all parameters generating
  scattering (HIP cycle\, temperature homogeneity\, filling and handling of
  capsules…) . The paper enables to define through parametric modeling wh
 ich material properties\, geometrical factors and process parameters are e
 ssential for reaching the dimensional precision and what realistic toleran
 ces can be respected.\n\nhttps://events01.synchrotron.org.au/event/47/cont
 ributions/1019/
LOCATION:
URL:https://events01.synchrotron.org.au/event/47/contributions/1019/
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BEGIN:VEVENT
SUMMARY:Tailoring HIP Equipment  and Protocols for the Unique Features of 
 MIM
DTSTART;VALUE=DATE-TIME:20171208T042500Z
DTEND;VALUE=DATE-TIME:20171208T045000Z
DTSTAMP;VALUE=DATE-TIME:20260513T215904Z
UID:indico-contribution-284-984@events01.synchrotron.org.au
DESCRIPTION:Speakers: Robert Conaway (1944)\nhttps://events01.synchrotron.
 org.au/event/47/contributions/984/
LOCATION:
URL:https://events01.synchrotron.org.au/event/47/contributions/984/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precise prediction of near net shape HIP components through DEM an
 d FEM modelling
DTSTART;VALUE=DATE-TIME:20171208T040000Z
DTEND;VALUE=DATE-TIME:20171208T042500Z
DTSTAMP;VALUE=DATE-TIME:20260513T215904Z
UID:indico-contribution-284-978@events01.synchrotron.org.au
DESCRIPTION:Speakers: Yuanbin Deng (RWTH Aachen University\, Institute for
  Materials Applications in Mechanical Engineering\, IWM)\nIn Hot Isostatic
  Pressing (HIP) of metal powder\, anisotropic shrinkage of the capsule ind
 uced by inhomogeneity of the initial powder filling density determines the
  reproducible realization of small geometrical allowances. This becomes a 
 detrimental factor in the manufacturing of near-net-shape components due t
 o their high requirements of the final shape accuracy. This challenge can 
 be solved by precisely predicting and controlling the shrinkage with respe
 ct to the filling density via numerical simulation. Using a Discrete-Eleme
 nt-Method (DEM) script\, a two-dimensional initial powder density distribu
 tion on the component cross section is simulated. After being validated by
  experimental results from metallographic examination\, the calculated pow
 der density distribution is assigned as the initial relative densities in 
 a Finite-Element (FE) model. An in-house developed user defined material m
 odel Subroutine (UMAT)\, which considers both instantaneous plasticity at 
 lower temperatures and rate dependent plasticity at higher temperatures\, 
 is utilized in the frame of ABAQUS for the simulation. In addition\, both 
 the gravity and the friction between the capsule and the support are also 
 taken into account in the simulation\, as these two factors are not neglig
 ible in an industrial-scale HIP-process. The preliminary experimental vali
 dation using pre-prototype component reveals that the shrinkage induced sh
 ape changes during HIP can be accurately predicted by several virtual iter
 ative simulations. Furthermore\, the influences of local density distribut
 ion\, gravity and friction force during HIP are also investigated. In summ
 ary\, the developed simulation method demonstrates high accuracy in HIP co
 mponent shape prediction and can be easily applied to design HIP capsules 
 for large and complex components.\n\n**Innovative Aspects:**\n\n•The DEM
  simulation shows the feasibility to simulate the powder distribution insi
 de a capsule taking into account the individual filling configurations and
  procedures. \n\n•The FE-Model is improved with the addition of gravity 
 and friction forces to the driving force for deformation during HIP.\n\nht
 tps://events01.synchrotron.org.au/event/47/contributions/978/
LOCATION:
URL:https://events01.synchrotron.org.au/event/47/contributions/978/
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SUMMARY:Prediction of the influence of non-homogeneous powder distribution
  on hot isostatically pressed components combining discrete element method
  and finite element analysis
DTSTART;VALUE=DATE-TIME:20171208T033500Z
DTEND;VALUE=DATE-TIME:20171208T040000Z
DTSTAMP;VALUE=DATE-TIME:20260513T215904Z
UID:indico-contribution-284-973@events01.synchrotron.org.au
DESCRIPTION:Speakers: Alessandro Abena (University of Birmingham)\nThe non
 -uniform shrinkage of the tool/canister under hot isostatic pressing (HIP)
  condition is influenced by many factors\, among which the powder relative
  density distribution seems to have a strong effect.  Prediction of the fi
 nal tool deformation is fundamental for canister design in order to meet d
 imensional tolerances of final component. To this end\, numerical approach
 es represent a promising alternative to the expensive iterative experiment
 al trials. Researches up to date are generally based on finite element ana
 lysis where a uniform powder relative density distribution is assigned ove
 r the whole mesh domain. In this study the Discrete Element Method (DEM) h
 as been employed to simulate Ti-6Al-4V powder filling and pre-consolidatio
 n process allowing modelling the powder as single individual entities.  A 
 Finite Element Model (FEM) has been developed to simulate the HIP process\
 , where the relative density distribution assigned to each element has bee
 n calculated from the final powder configuration obtained by DEM. Moreover
 \, experimental work has been carried out validating the powder filling ph
 ase in terms of filling time\, angle of repose of powder and powder relati
 ve density distribution\, and the influence of the initial powder distribu
 tion on the tool shrinkage. Comparison between experimental and numerical 
 results shows the capacity of the numerical method to predict the canister
  shrinkage and the results strongly suggest that it is necessary to take i
 nto account the inhomogeneous powder distribution inside the canister.\n\n
 https://events01.synchrotron.org.au/event/47/contributions/973/
LOCATION:
URL:https://events01.synchrotron.org.au/event/47/contributions/973/
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