钛合金与不锈钢真空热轧连接界面微观结构及性能

Interfacial microstructure of hot roll bonded joints of titanium alloy to stainless steel

摘要: 完成了TC4钛合金与304不锈钢的直接真空热轧连接，连接界面微观结构的研究结果表明，当压缩率20%，轧制速度0.038 m/s时，轧制温度800℃时连接界面存在未连接的孔洞，轧制温度850℃时连接界面形成了三层金属间化合物层，其中富铬层硬度约为母材钛合金硬度的2倍，轧制温度900℃时连接界面产生了金属间化合物层之间或金属间化合物层与母材之间的开裂现象.轧制温度850℃时接头抗拉强度最高，可达77.33 MPa.拉伸试样均为脆性断裂，不锈钢一侧的断口存在γFe，Cr，Fe₂Ti，σ和Cr₂Ti.

Abstract: Vacuum hot roll bonding was used to join TC4 titanium alloy to 304 stainless steel successfully. The test result showed that the hole appearson the interface at the bonding temperature of 800℃.Three layers of intermetallic compounds formon the interface at the bonding temperature of 850℃, and the hardness of Cr-riched layer is about twice higher as that of titanium alloy.The formation of cracks in bonding interface at the bonding temperature of 900℃. The highest tensile strength of 77.33 MPa is obtained at the bonding temperature of 850℃. The fracture is brittle mode, γFe、Cr、Fe₂Ti、σ and Cr₂Ti are found at stainless steel side.