Interfacial structure and mechanical properties of hot-roll bonded joints between titanium alloy and stainless steel using niobium interlayer  

采用铌中间层的钛合金与不锈钢的真空热轧连接界面的显微组织及性能(英文)

作　　者：赵东升[1] 闫久春[2] 刘玉君[1] 纪卓尚[1] 

机构地区：[1]大连理工大学船舶工程学院工业装备结构分析国家重点实验室,大连116024 [2]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第9期2839-2844,共6页中国有色金属学报（英文版）

基　　金：Project(AWPT-M07)supported by State Key Laboratory of Advanced Welding and Joining,China;Project(20120041120015)supported by Specialized Research Fund for the Doctoral Program of Higher Education,China

摘　　要：The hot-roll bonding was carried out in vacuum between titanium alloy and stainless steel using niobium interlayer. The interfacial structure and mechanical properties were analyzed. The results show that the plasticity of bonded joint is improved significantly. When the bonding temperature is 800 °C or 900 °C, there is not intermetallic layer at the interface between stainless steel and niobium. When the bonding temperature is 1000 °C or 1050 °C, Fe-Nb intermetallic layer forms at the interface. When the bonding temperature is 1050 °C, cracking occurs between stainless steel and intermetallic layer. The maximum strength of -417.5 MPa is obtained at the bonding temperature of 900 °C, the reduction of 25% and the rolling speed of 38 mm/s, and the tensile specimen fractures in the niobium interlayer with plastic fracture characteristics. When the hot-roll bonded transition joints were TIG welded with titanium alloy and stainless steel respectively, the tensile strength of the transition joints after TIG welding is -410.3 MPa, and the specimen fractures in the niobium interlayer.进行了钛合金与不锈钢采用铌中间层的真空热轧连接实验,分析了连接界面的显微组织及性能。结果表明,采用铌中间层能够明显提高接头的塑性。当压缩率为25%,轧制速度为38 mm/s,热轧温度为800°C和900°C时,不锈钢与铌的连接界面没有明显的金属间化合物层;当热轧温度为1000°C和1050°C时,不锈钢与铌连接界面形成Fe-Nb金属间化合物层,并且当热轧温度为1050°C时在金属间化合物层与不锈钢之间出现开裂。铌与钛合金连接界面的扩散层厚度随着热轧温度的升高而增大。热轧温度为900°C的连接接头的拉伸强度可达-417.5MPa,拉伸试样断裂于铌中间层,断口呈塑性断裂特征。热轧温度为800°C的热轧过度接头分别与钛合金和不锈钢进行TIG焊接,TIG焊后热轧过度接头的拉伸强度可达-410.3 MPa,拉伸试样断裂于铌中间层,断口呈塑性断裂特征。

关 键 词：hot roll bonding titanium alloy stainless steel NIOBIUM 

分 类 号：TG335[金属学及工艺—金属压力加工]