保温时间对304不锈钢板翅结构真空钎焊的影响  

Effect of holding time on vacuum brazing for 304 stanless steel plate-fin structure

作　　者：蒋文春[1,2] 巩建鸣[2] 涂善东[2] 

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

出　　处：《机械设计与制造》2010年第11期79-81,共3页Machinery Design & Manufacture

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);江苏省普通高校研究生科研创新计划(2007)

摘　　要：应用镍基钎料BNi2对304不锈钢板翅结构进行真空钎焊试验,进行了强度试验和微观组织观察。研究了钎焊保温时间对强度和微观组织的影响。结果表明,保温时间对硼元素扩散影响很大,从而对强度和微观组织产生影响。保温时间太短,硼元素来不及扩散,遗留在钎缝中间生成脆性化合物,使得接头强度降低;保温时间太长,会导致母材过度溶解于钎缝,导致缺陷增加,同时太长时间的高温暴露,使得界面出现溶蚀现象。因此,对于304不锈钢板翅结构的钎焊,保温时间控制在25分钟左右较为合适。The vacuum brazing experiments of 304 stainless steel plate fin structure was carried out. And the tensile tests of plate fin structure and scanning electron microscope （SEM）tests were carried out. The effects of holding time on tensile strength and microstructure were investigated.The results show that the holding time has great effect on tensile strength and microstructure.If the holding time is too short,the Boron can not diffuse to the base metal sufficiently, which leads that the residual Boron generate more brittle phases in the joint and decrease the strength.If the holding time is too long,the base metal will dissolve to the filler metal excessively,which generates more defects and decrease the strength. For the brazing of 304 stainless steel plate fin structure,the holding time should be kept around 25 minutes.

关 键 词：不锈钢板翅结构 真空钎焊 保温时间 强度 微观组织 

分 类 号：TH16[机械工程—机械制造及自动化] TG454[金属学及工艺—焊接]