液压断路装置中的阀体开裂分析

Crack Analysis on Valve-Body of Hydromatic Switch Unit in High-Tension Transmission Circuit

对高压输变电线路制造的液压断路装置中的阀体开裂进行了分析。认为主要原因是热处理后造成了第一类回火脆性;阀体又因镀锌,未能将引入的氢去除,致使阀体工作时在应力集中位置造成氢的聚集而产生滞后破坏型断裂。

The cracking of a valve-body of hydromatic switch unit in high-tension transmission circuit was analyzed. The valve-body was in a state of first type of temper embrittlement due to an improper heat treatment. In addition, the treatment of hydrogen removal was not made after zinc plating of the valve-body. Both of causes above mentioned,the embrittlement state of the valve-body and the presence of hydrogen in the valve-body, brought about a hydrogen aggregation at stress raisers and the hydrogen-induced delaved failure ultimatelv occurred in the valve-body when the valve-body worked.