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mMINING METALLURGY MATERIALS
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Universitätslehrerverband der
Montanuniversität Leoben (ULV)
Grain structure design of hot formed and annealed
multi phase alloys
Simulation and modeling of the microstructure during hot forming and annealing
process of both nickel-based alloy 80 a and austenitic stainless steel 304 L.
project partner: Böhler Edelstahl GmbH,
Kapfenberg
research partner: IMK Leoben, CDL-ESI Leoben,
IWS Graz, ZFE Graz
project period: 04/2006 - 12/2009
Mirza Candic
Christian Doppler Laboratory for
Materials Modeling and Simulation
Zur Person:
Studium: Nichteisenmetallurgie
Montanuniversität Leoben
During multipass hot deformation, retained strains exist due to
inhomogeneous deformation as well as different degrees of recovery
and recrystallization related to both strain rate and temperature
gradients. This project deals with experimental and modeling
work on the retained strain and its influence on the resulting grain
structures. The nickel-based alloy 80a (Böhler L306, Ni–20Cr) and
the austenitic stainless steel 304 L (Böhler A607, Fe-18Cr-8Ni) from
Böhler Edelstahl GmbH are to be investigated.
Because of its limited contact area, the microhardness measurements
are adequate to represent the local strains and thus the retained
strain as well as its distribution. Using double-hit compression
tests and microhardness measurements under various deformation
conditions, the retained strain of both alloys is studied. An increase
of the retained strain after the second pass is shown (alloy 80a).
ϕ 1 or ϕ 2 ...deformation strain of the first or second pass
t d ...dwell duration
Forschungsschwerpunkte:
- Retained strain during multipass hot deformation of
the alloys 80 a and 304 L
- Influence of the retained strain on the grain structure
evolution during annealing of the as deformed
alloys
- Simulation and modeling of the microstructure
development