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金属学报 2007
Finite Element Analysis of Creep for Micro Stainless Steel Plate-fin Heat Exchanger
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Abstract:
According to Norton Creep Constitutive Equation and creep parameters of as-cast Ni-based BNi-2 filler and 0Cr18Ni9 stainless steel, 100 thousand hours creep analysis for Micro Plate-fin Heat Exchanger made of stainless steel was carried out by ABAQUS finite element code. The creep strain and stress distribution of overall Micro Plate-fin Structure was obtained. The creep deformation and the most dangerous position at high temperature were predicted. Due to the mismatch of mechanical property between brazing filler metal and base metal, the welding residual stress was generated inevitably during the brazing process, which has great influence on the creep deformation and life. Especially in the fillet, the creep strain and stress distribution is inhomogeneous and concentrated. In the interface, the stress and strain show discontinuous and uncoordinated, which have great effect on creep failure.
