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