摘要
采用全自动钨极氩弧焊进行了BFe30-1-1合金管板与换热管的封焊试验,获得了稳定可靠的BFe30-1-1合金管板封焊工艺,并对管板封焊试样的接头宏观金相、微观组织、力学性能、腐蚀性能进行了研究。结果表明:管板和换热管封焊接头过渡性良好,成型精度高,接头截面无明显缺陷;母材为孪晶状等轴α组织,晶粒度为9级;焊缝为细长的枝晶状α组织;热影响区由粗大的孪晶α相组成,晶粒度为7级;拉脱强度大于换热管或管板许用抗拉强度的0.5倍,断裂形式为韧性断裂;三组封焊试样的腐蚀速率相近,平均腐蚀速率为0.011g·m^(2)/h。
The sealing welding test between tube plate and heat exchange tube of BFe30-1-1 alloy was carried out by using automatic gas tungsten arc welding, and stable and reliable sealing welding process of BFe30-1-1 alloy tube plate was obtained. The macro-metallography, microstructure, mechanical properties and corrosion property of the joint of tube plate samples were studied. The results show that the transition of the joint between tube plate and exchange tube is good, the forming precision is high, the joint section has no obvious defects. The base metal is composed of a twin-crystal equiaxed αstructure with grain size of grade 9. The weld is composed of elongated dendritic α. The heat affected zone is composed of coarse twin α phase with grain size of Grade 7. The pull-out strength is higher than 0.5 time of the allowable tensile strength of heat exchange tube or tube plate, and the fracture mode is ductile fracture. The corrosion rate of three seal welding specimens is similar, and the average corrosion rate is 0.011 g·m^(2)/h.
作者
刘甲
马照伟
邱胜闻
符成学
杜志博
袁博
LIU Jia;MA Zhaowei;QIU Shengwen;FU Chengxue;DU Zhibo;YUAN Bo(Luoyang Ship Material Research Institute,Luoyang 471039,China)
出处
《热加工工艺》
北大核心
2022年第7期61-65,共5页
Hot Working Technology
关键词
管板
封焊
微观组织
力学性能
腐蚀性能
tube plate
sealing welding
microstructure
mechanical properties
corrosion property
