TC17钛合金叶盘破裂分析

压气机风扇部件试验件试验过程中叶盘破裂失效.本研究通过断口宏微观观察、金相组织检查、力学性能测试、疲劳模拟试验及改进措施验证,确定了叶盘的失效性质和原因.结果表明:叶片为高周疲劳断裂,为肇事件,鼓筒、盘体均为过载断裂;断裂叶片表面存在横向加工刀痕、材料组织状态不良、断裂韧度低是导致叶片发生高周疲劳断裂的原因.通过采取改善叶盘锻件毛坯的力学性能、严格控制零件表面质量,有效预防了叶盘发生破裂失效.

Breakage Analysis of Impeller Disk of TC17 Titanium Alloy

An impeller disk of the fan part of a compressor failed during testing. Based on macro and micro appearance observation, metallurgical structure inspection, mechanical property testing, fatigue simulation test, and verification for improved methods, the failure mechanism and cause were found. The results showed that blade fractured firstly, which happened in a high cycle fatigue mode. Drum and disk fractured in an over-loading mode. The transversal machining marks on surface of fractured blade, inferior microstructure and low fracture toughness were the cause of high cycle fatigue fracture. The mechanical property of the forging blank was improved, and the surface quality was strictly controlled. As a result, the failure of the impeller disk was effectively prevented.