摘要
根据BS74 4 8断裂韧度试验标准 ,对X6 5管线钢焊接接头的低温 (0℃ )裂纹尖端张开位移 (CTOD)进行了测试。取尺寸为B× 2B(B为试样厚度 )、缺口方向为NP的试样进行三点弯曲试验 ,然后由所得到的 0℃下母材、焊缝和热影响区 (HAZ)的P -V曲线来计算CTOD值 ,并对试验结果进行了讨论和总结。对显微组织的分析表明 ,共有3个HAZ试件不满足裂纹尖端不超过熔合线 0 .5mm且落在粗晶区内的要求。该结果恰好与P -V曲线和所得的CTOD值相一致 ,从而解决了试验值分散性大的问题 ,同时为ECA评估提供了重要依据 ,验证了BS74 4 8标准的合理性并体现了它的优越性。
In accordance with the BS 7448, fracture toughness test standard, CTOD (crack tip opening displacement) tests were conducted at 0°C in welded joints of X65 pipeline steel. According to the requirements of the standard, the specimen is of standard three-point bending shape that has a rectangular section of B×2B and notch orientation of NP. The results were calculated by using the P-V curves of parent material, weld metal and HAZ (heat affected zone). It indicates by the microstructure that there are 3 HAZ specimens of which the fatigue crack lip is not more than 0.5 mm from the fusion line with coarse grain zone. The test results are in consistence with the P-V curves and CTOD values, explaining the dispersity of the test values, providing reliable evidence for engineering critical assessment and validate the BS7448 and its superiority.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2003年第3期13-16,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目 ( 5 9975 0 66)
中国海洋石油工程股份有限公司资助项目
