钎缝厚度对不锈钢板翅结构蠕变的影响

利用有限元软件ABAQUS,建立不锈钢板翅结构高温蠕变的有限元计算模型,讨论钎缝厚度对蠕变的影响.结果表明,钎缝厚度对蠕变的影响很大.由于钎料和母材力学性能的不匹配,导致不锈钢板翅结构产生了复杂的残余应力.随着钎缝厚度的变化,残余应力发生变化,从而对蠕变产生影响.在钎缝区域,随着钎缝厚度增加,焊态残余应力降低,导致蠕变应变降低,接头强度提高.在垂直于隔板的翅片区域,钎缝厚度对焊态残余应力没有影响,蠕变变化很小.在隔板区域,随着钎缝厚度增加,焊态残余应力降低,导致蠕变应变降低.研究结果为不锈钢板翅结构高温强度设计提供参考.

Effect of filler metal thickness on creep for stainless steel platefin structure

The finite element(FE)creep analysis of stainless steel plate-fin structure was performed by FE-program ABAQUS. The focus was placed on the effect of filler metal thickness on creep strain.The results show that the filler metal thickness has great effect on creep at elevated temperature.The complex residual stress was generated in the plate-fin structure due to the material mismatching between base metal and filler metal.The residual stress was changed with the filler metal thickness changing, which causes the creep change.In the filler metal, the brazed residual stress is decreased with the filler thickness increasing, which leads to the creep strain decreasing.In the fin, the filler metal thickness has little effect on creep strain because the brazed residual stress is not affected by filler metal thickness.In the plate, the creep strain is decreased due to the brazed residual stress decreasing with filler metal increasing.This work provides a reference for the high temperature strength design of stainless steel plate-fin structure.