化工装备技术
化工裝備技術
화공장비기술
Chemical Equipment Technology
2015年
5期
20-23,26
,共5页
压力容器%服役周期%逆推法%临界裂纹尺寸%应力腐蚀%表面裂纹
壓力容器%服役週期%逆推法%臨界裂紋呎吋%應力腐蝕%錶麵裂紋
압력용기%복역주기%역추법%림계렬문척촌%응력부식%표면렬문
Pressure vessel%Maintenance period%Inverse extrapolation%Critical crack size%Stress corrosion%Surface crack
测量了压力容器用钢在3.5% NaCl溶液中的应力腐蚀门槛值KISCC和腐蚀疲劳裂纹扩展速率da/dN. 通过逆推法计算了不同服役周期下初始裂纹或缺陷的临界尺寸, 发现在a/c<1的情况下裂纹主要沿着深度a方向扩展, 而在长度c方向基本没有扩展, 裂纹的形状逐渐由椭圆形向圆形转变.
測量瞭壓力容器用鋼在3.5% NaCl溶液中的應力腐蝕門檻值KISCC和腐蝕疲勞裂紋擴展速率da/dN. 通過逆推法計算瞭不同服役週期下初始裂紋或缺陷的臨界呎吋, 髮現在a/c<1的情況下裂紋主要沿著深度a方嚮擴展, 而在長度c方嚮基本沒有擴展, 裂紋的形狀逐漸由橢圓形嚮圓形轉變.
측량료압력용기용강재3.5% NaCl용액중적응력부식문함치KISCC화부식피로렬문확전속솔da/dN. 통과역추법계산료불동복역주기하초시렬문혹결함적림계척촌, 발현재a/c<1적정황하렬문주요연착심도a방향확전, 이재장도c방향기본몰유확전, 렬문적형상축점유타원형향원형전변.
Stress corrosion threshold KISCC and corrosion fatigue crack growth rate da/dN of the steel for pressure vessel in 3.5% NaCl are measured. The critical sizes of the initial cracks or defects under different maintenance periods are calculated through the inverse extrapolation . The results show that the cracks extend along the a depth direction and there is no extension in the c longitudinal direction when a/c<1. Meanwhile the shape of the crack gradually changes from oval to circular.
