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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:20260613T183854Z
UID:indico-contribution-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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