TTCAN总线的节点设计

针对某燃气涡轮发动机发生的GH4169合金螺栓断裂故障,通过对故障螺栓进行断口宏微观观察、化学成分分析、硬度检测和金相组织分析,以及对未发生断裂失效的螺栓和螺母进行检查与分析,确定了该燃气涡轮发动机螺栓断裂性质为镉脆断裂;与螺母表面的镀镉层紧密接触、受到拉应力的作用以及工作温度较高,是导致螺栓发生镉脆断裂的主要原因。为此,提出了在涡轮后机匣连接部位选用GH4169合金螺母,并在发动机热端零部件连接件中避免使用镀镉层进行表面防护等建议,可供排除类似故障时借鉴。

Fracture Failure Analysis of Bolt in a Gas Turbine Engine

Aiming at the fracture fault of GH4169 alloy bolt of a gas turbine engine, the failure mode of bolt is Cadmium embrittlement by macro and micro observation of fracture surface, chemical composition analysis, hardness testing, metallurgical structure analysis, examination and analysis of fault-free bolts and nuts. The main causes of the Cadmium embrittlement fracture were that it contacted with Cadmium plating layer of nut, suffered loaded tension stress effect and high wok temperature. Some suggestions are proposed to provide references for eliminating similar fault,which the GH4169 alloy bolt are used in the connection of turbine rear casing and the Cadmium plating are avoided to use the surface protection in the connection of the hot section components and parts.