K640合金TLP连接接头组织及力学性能

为考察瞬时液相(TLP)连接方法对钴基高温合金K640合金的适用性,采用非晶态中间层进行连接试验,观察接头区显微组织,测试接头的力学性能并进行断口分析。结果表明:瞬时液相连接能够实现K640合金的良好结合,接头组织致密,成分均匀,组织与成分均与母材接近;接头高温拉伸强度达到等条件下母材强度74%,断口具有明显的韧窝形貌;高温持久强度达到等条件下母材强度的70%以上。

Microstructure and Mechanical Properties of K640 TLP Bonded Joint

In order to study the applicability of Transient Liquid Phase(TLP) bonding method to Cobalt-based superalloy K640,the bonding test adopting amorphous interlayer was carried out.Microstructure observation and mechanical property testing of joints,as well as fracture surface analysis were conducted after the test.The test results confirmed that the adoption of TLP method contributed to a satisfying jointing with perfect tightness and uniformity.The joint had homogeneous composition and structure similar to the parent material.The elevated tensile strength of the joint reached 74% of that of the parent metal and the fracture surface exhibited obvious dimple characteristic.The elevated endurance strength of the joint also reached 70% above that of the parent metal.