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X80 管道 FCAW 环焊缝热影响区断裂韧性结果的统计评估

Statistical Assessment of Fracture Toughness Results from the HAZ of X80 Pipeline FCAW Girth Weld.

作者信息

Chen Hongyuan, Feng Qingshan, Bi Ying, Gao Xiongxiong, Dai Lianshuang, Chi Qiang

机构信息

School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an 710077, China.

出版信息

Materials (Basel). 2022 Sep 5;15(17):6157. doi: 10.3390/ma15176157.

DOI:10.3390/ma15176157
PMID:36079540
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9457842/
Abstract

Due to the wide application of flux-cored arc welds (FCAW) susceptible to significant scatter in weld and Heat Affected Zone (HAZ) fracture toughness, there is an interest in methods for evaluating the reliability of welds containing defects. The mechanical properties of the FCAW girth weld of an X80 pipeline are tested and then analyzed. By obtaining fracture toughness results from a statistically significant number of SENB specimens, with notches positioned in different HAZ locations, the effect of variation within the results can be evaluated. The results of the fracture toughness tests were analyzed using statistical methods, to compare both the difference in behavior between HAZ microstructures and the variation when a similar microstructure has been sampled. The range of different characteristic toughness values was analyzed using a postulated ECA case to illustrate the sensitivity of the results to how toughness is defined. The analyses supported recommendations to be made on the optimum approach to characterizing HAZ fracture toughness for reliable pipeline assessments in multi-pass girth welds with complex HAZ microstructure distributions.

摘要

由于药芯焊丝电弧焊（FCAW）广泛应用，其焊缝和热影响区（HAZ）的断裂韧性存在显著离散，因此人们对评估含缺陷焊缝可靠性的方法颇感兴趣。对一条X80管道的FCAW环焊缝的力学性能进行了测试并随后进行分析。通过从数量具有统计学意义的单边缺口弯曲（SENB）试样获取断裂韧性结果，且缺口位于不同的热影响区位置，可评估结果中的变化影响。使用统计方法对断裂韧性测试结果进行分析，以比较热影响区微观结构之间的行为差异以及对相似微观结构进行采样时的变化情况。使用假定的工程临界评估（ECA）案例分析不同特征韧性值的范围，以说明结果对韧性定义方式的敏感性。这些分析为在具有复杂热影响区微观结构分布的多道环焊缝中进行可靠管道评估时，表征热影响区断裂韧性的最佳方法提供了支持性建议。

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