摘要
文中采用主曲线方法对X80高强管线钢环焊缝在韧脆转变区的断裂韧性分布规律进行了系统研究.根据美国材料试验协会(American Society for Testing and Materials,ASTM)标准ASTM E1921-97《过渡区铁素体钢参考温度T_(0)测定的标准试验方法》,开展不同温度条件下的断裂韧性测试,并通过多温度法计算了参考温度T_(0)及不同失效概率下的断裂韧性预测曲线.此外,结合经验公式将夏比冲击能量转化为对应温度下的断裂韧性,与直接通过断裂韧性试验获得的结果进行了对比分析.为验证方法的有效性,收集了实际管道建设中的198组断裂韧性试验数据,通过单温度法确定了T_(0).结果表明,单温度法确定的T_(0)值与试验结果具有良好的一致性.充分证明了主曲线方法在描述X80管道环焊缝韧脆转变行为中的有效性和适用性,为高强管线钢断裂韧性评估提供了理论依据,同时为工程实践中管道完整性评价提供了可靠的方法支持.
The fracture toughness distribution of X80 high-strength pipeline steel girth welds in the ductile-to-brittle transition region was systematically studied using the master curve method.According to ASTM E1921-97 Standard Test Method for Determination of Reference Temperature T_(0),for Ferritic Steels in the Transition Range by American Society for Testing and Materials(ASTM),fracture toughness tests were conducted at various temperatures,and the fracture toughness prediction curves at the reference temperature(T_(0))and different failure probabilities were determined using the multi-temperature method.Charpy impact energy was converted to fracture toughness at corresponding temperatures using empirical formulas,and the results were compared with direct test data.To validate the effectiveness of the method,198 pieces of fracture toughness data from pipeline projects were analyzed,and T_(0) was calculated using the single-temperature method.The results show that the T_(0) value determined by the single-temperature method has good consistency with the test results,fully demonstrating the effectiveness and applicability of the main curve method in describing the ductile-to-brittle transition behavior of X80 pipeline girth welds.This research provides a theoretical basis for the assessment of fracture toughness of high-strength pipeline steel,as well as reliable methodological support for pipeline integrity evaluation in engineering practice.
作者
龚宝明
赵辰妍
赵海微
赵子峰
戴联双
邓彩艳
GONG Baoming;ZHAO Chenyan;ZHAO Haiwei;ZHAO Zifeng;DAI Lianshuang;Deng Caiyan(School of Materials Science and Engineering,Tianjin University,Tianjin,300350,China;PipeChina Engineering Technology Innovation Co.,Ltd,Tianjin,300450,China;China Oil&Gas Pipeline Network Corporation,Beijing,100020,China)
出处
《焊接学报》
北大核心
2025年第7期9-14,22,共7页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(52075366)。
关键词
断裂韧性
韧脆转变
主曲线法
参考温度
fracture toughness
ductile-to-brittle transition
master curve method
reference temperature
