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用真空扩散连接的方法对ＴｉＡｌ／４０Ｃｒ钢进行了扩散连接。结果表明，在ＴｉＡｌ／４０Ｃｒ钢接头的界面处中出现了三个扩散层．它们分别是：邻接 ＴｉＡｌ侧的Ｔｉ３Ａｌ＋ ＦｅＡｌ＋ ＦｅＡｌ２金属间化合物混合层，中间的 ＴｉＣ层，靠近 ４０Ｃｒ钢侧的脱碳固溶层；并且随着焊接温度的提高，保温时间的延长，三个扩散层的厚度均显著增大。力学性能测试表明，ＴｉＡｌ／４０Ｃｒ 扩散连接接头的拉伸强度很低，断口为脆性断裂，主要断裂在界面层中的ＴｉＣ处。为了获得结合较好拉的伸强度较高的ＴｉＡｌ／４０Ｃｒ钢扩散连接接头，宜采用高温短时规范，以达到控制及减少脆性相及金属间化合物的目的。
The diffusion bonding of TiAl / 40Cr steel was carried out by vacuum diffusion bonding. The results show that there are three diffusion layers in the interface of TiAl / 40Cr steel joints. They are respectively: Ti3Al + FeAl + FeAl2 intermetallic compound layer adjacent to TiAl side, intermediate TiC layer, and decarburized solid solution layer close to 40Cr steel side; and with the increase of welding temperature and holding time, three diffusion layers The thickness is significantly increased. Mechanical tests show that the tensile strength of TiAl / 40Cr diffusion bonded joints is very low, the fracture is brittle fracture, and the main fracture is TiC in the interfacial layer. In order to obtain better tensile strength TiAl / 40Cr steel diffusion bonding joints, should adopt the short-term high-temperature specifications, in order to achieve control and reduce the brittle phase and intermetallic compounds.