某风机在试运行过程中其膜片联轴器发生断裂失效, 采用宏观分析、金相检验、化学成分分析和力学性能测试等方法对联轴器的断裂原因进行了分析。结果表明: 该联轴器发生断裂主要是由于联轴器锻造后热处理不当, 形成过热组织缺陷, 从而导致其韧性极差; 另一方面是由于联轴器锻造后未进行退火处理, 内应力未及时消除, 最终导致其在使用过程中的应力作用下发生早期脆性断裂失效。对断裂的联轴器进行退火+调质处理, 可使其韧性大幅度提高, 得到优良的综合力学性能。

A membrane blower coupling fractured during the trial operation. Means such as macro examination, metallographic examination, chemical compositions analysis, and mechanical properties test were used to analyze fracture reason of the coupling. The results show that overheated microstructure caused by unsuitable heat treatment was the main reason for the frcature, which resulted in poor toughness of the coupling. And the stress was not released in time by annealing. Finally early brittle fracture of the coupling occurred in service. After quenching and tempering treatment to the fractured coupling, the impact toughness was greatly improved, and the comprehensive mechanical properties of the coupling were excellent.