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Variations in DBTT and CTOD within weld heat-affected zone of API X65 pipeline steel

机译：API X65管线钢的焊接热影响区内DBTT和CTOD的变化

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摘要

The fracture resistance of heat-affected zones (HAZs) in girth welded joint of API X65 steel pipeline was systematically investigated. While the change in Charpy impact energy has been typically evaluated in previous studies, here the variations in ductile-to-brittle temperature (DBTT) and crack-tip opening displacement (CTOD) within HAZ were explored. A series of experiments revealed that both values vary dramatically (i.e., DBTT increases and CTOD decreases) as the location approaches the fusion line (FL) and thus the region adjacent to FL exhibited the lowest CTOD and highest DBTT, possibly due to the increasing portion of coarse-grained HAZ. Interestingly, however, even the FL regions still showed moderate toughness at -40 ℃ ～ room temperature. Microstructural analysis and additional impact tests using simulated HAZ specimens suggested a possibility that fine-grained HAZs with higher toughness may suppress the brittle fracture from neighboring coarse-grained region.
机译：系统地研究了API X65钢管环缝焊缝热影响区的抗断裂性能。虽然夏比冲击能的变化通常在先前的研究中进行过评估，但这里还是探讨了热影响区中韧性至脆性温度（DBTT）和裂纹尖端开口位移（CTOD）的变化。一系列实验表明，当位置接近融合线（FL）时，这两个值都发生显着变化（即，DBTT增大而CTOD减小），因此，与FL相邻的区域显示出最低的CTOD和最高的DBTT，这可能是由于增加的部分粗粒热影响区。有趣的是，即使在FL区域，在-40℃〜室温下仍显示出中等韧性。使用模拟的热影响区试样进行微结构分析和其他冲击试验表明，具有较高韧性的细晶粒热影响区可能会抑制来自邻近粗晶粒区域的脆性断裂。

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