2FZ35-70防喷器壳体失效分析

Failure analysis of 2FZ35-70 BOP shell

某井控装备防喷淋器壳体在水压试验时发生开裂。利用化学分析、宏观断口分析、显微组织和扫描电镜及力学性能等方法进行了分析。结果表明,构件的断裂机制为低应力脆性断裂,裂纹扩展速率很大,招致瞬间破裂;断裂为多源性;首要的改进措施是必须消除组织遗传,进一步提高堆焊区的焊接质量作为改进措施之二,以矫正未熔合缺陷。

A well control equipment anti-sprinkler housing cracked during the hydrostatic test. The analysis was carried out by chemical analysis, macroscopic fracture analysis, microstructure, scanning electron microscopy and mechanical properties. The results show that the fracture mechanism of the member is low stress brittle fracture, the crack growth rate is very large, causing instantaneous rupture;the fracture is multi-source;the first improvement is to eliminate the tissue inheritance and further improve the welding quality of the surfacing area as an improvement measure. Second, to correct unfused defects.