钎料厚度对不锈钢板翅结构抗拉强度影响的有限元分析与试验研究  

Vacuum Brazing of 304 Stainless Steel Plate-Fin Structure and Simulation of Its Tensile Strength

作　　者：巩建鸣[1] 蒋文春[1,2] 

机构地区：[1]南京工业大学机械与动力工程学院,南京210009 [2]中国石油大学(华东)机电工程学院,东营257061

出　　处：《真空科学与技术学报》2010年第5期561-566,共6页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金资助项目(10472043);江苏省自然科学基金(BK2004214);江苏省工业装备数字制造及控制技术重点实验室开放课题(2010)

摘　　要：对304不锈钢板翅结构进行真空钎焊试验，对单轴拉伸进行试验研究与有限元分析，讨论钎料厚度对不锈钢板翅抗拉强度的影响。研究结果表明，钎料厚度对304不锈钢板翅结构强度影响较大。当钎料厚度小于105um时，随着钎缝厚度增加，抗拉强度增加；当厚度增加到105～140um时，抗拉强度基本保持不变；当厚度超过140um时，抗拉强度降低。随着钎料厚度增加，钎角应力集中降低；钎角面积增加，使得承载能力增加，强度增加；但是钎角脆性相的含量也同时增加，降低接头强度。The impacts of the vacuum brazing conditions, including the filler metal thickness, pressure, and heating/ cooling modes, on the tensile strength of the 304 stainless steel plate-fin structure, were experimentally studied and analytically simulated in finite element method. Both the measured and calculated results show that the filler metal thickness strongly affects the tensile strength of the plate-fin structure. For instance, as the filler metal thickness increases in the three ranges：below 105um , 105 um to 140um, and beyond 140 um,the tensile strength first increases,then,remains unchanged, and finally, decreases, respectively. Besides, a thickness increase leads to the increases in the fillet area and load, which in turn, enhance the tensile strength, generate more brittle phases in the fillet, and reduce thebonding strength at the junctions.

关 键 词：不锈钢板翅结构 真空钎焊 钎料厚度 抗拉强度 有限元 

分 类 号：TG111.8[金属学及工艺—物理冶金]