基于有限元软件ABAQUS，利用Norton蠕变本构关系，根据铸态镍基钎料BNi-2和0Cr18Ni9不锈钢母材的蠕变材料参数，对采用钎焊结构的微型不锈钢板翅式换热器进行整体600℃下的蠕变变形有限元分析，得到10万小时后的蠕变变形分布规律，预测到板翅式换热器在高温下的变形和危险位置。结果表明，由于钎料和母材力学性能参数的不匹配，钎焊过程中在接头处产生了较大的残余应力，对钎焊接头的蠕变变形产生较大影响。在钎角处，蠕变应变和应力较大，且分布不均匀，界面应力应变分布呈不连续和不协调特性，对蠕变失效的影响较大。
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.
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