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首页> 外文会议>Asian Pacific conference for fracture and strength'99 (APCFS'99) >Test Study on Crack Arrest Toughness of Line Pipes
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Test Study on Crack Arrest Toughness of Line Pipes

机译：管道裂纹止裂韧性的试验研究

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摘要

SSAW(Spiral Submerged Arc Welding) pipes are widely used in oil and gas pipelines. Whilerntransmitting oil and gas, it is required to stop crack as soon as possible to avoid further disaster. Arnlot of empirical formulas were presented to describe the requirements of the fracture arrestrntoughness of pipelines in terms of Charpy Vee- Notch impact energy(CVN), but they were notrnsuitable for today’s high-toughness pipeline steels. Crack arrest toughness (KIa) ,a fracturernmechanics parameter to describe material’s ability to stop a running crack, was measuredrnaccording to the modified ASTM E1221, 《Standard Test Method for Determining Plain-StrainrnCrack Arrest Toughness, KIa , of Ferrite Steels》. This paper aimed at finding a suitable testrnmethod on KIa of API X series SSAW pipes and determining the crack arrest toughness of thernbase metal and the weld . Experiment showed that specimen scale and brittle weld metal hadrnimportant effect on test results. In this study, experiment apparatus and loading arrangement wasrnmodified on the basis of ASTM E1221. It was found that, as to line pipe, the specimen should bernlarge enough to ensure the crack to run and arrest, or else the test results were non-effective. SEMrnanalysis of specimen fracture surface showed that the crack growth path was made up of mainrncrack and secondary crack. The main crack is trans-granular fracture, whereas the main crack tiprnand secondary crack is mainly inter-granular fracture along ferrite matrix. Effect of specimen scalernand test temperature on test results were discussed too.
机译：SSAW（螺旋埋弧焊）管广泛用于石油和天然气管道。在输送石油和天然气的同时，需要尽快阻止裂缝，以免造成进一步的灾难。提出了经验公式，以夏比V型缺口冲击能（CVN）来描述管道的断裂止裂韧性要求，但不适用于当今的高韧性管道钢。根据改良的ASTM E1221《测定铁素体钢的平面应变裂纹逮捕韧性的标准测试方法》，测量了描述材料止裂的能力的断裂力学参数（KIa）。本文旨在寻找一种适用于API X系列SSAW管的KIa的试验方法，并确定母材和焊缝的裂纹抑制韧性。实验表明，试样鳞片和脆性焊缝金属对试验结果影响不大。在这项研究中，根据ASTM E1221对实验设备和装载装置进行了修改。已经发现，对于管线管，试样应足够大以确保裂纹能够运行并阻止，否则测试结果无效。试样断面的SEM分析表明，裂纹扩展路径由主裂纹和次裂纹组成。主裂纹为跨晶断裂，而主裂纹尖端和次裂纹主要为沿铁素体基体的晶间断裂。还讨论了标本规模和测试温度对测试结果的影响。

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  • 来源
  • 会议地点 Xian(CN);Xian(CN)
  • 作者

    C.J. Zhuang; J. Kang; Q.R. Ma; H.L. Li; Y.R. Feng; P.Q. Li;

  • 作者单位

    Tubular Goods Research Institute of CNPC,21 Dianzier Road, Xi'an, China, 710065;

    rnNorthwestern Architecture Institute 16 Xiaozhai Road , Xi'an, China, 710061;

    rnTubular Goods Research Institute of CNPC,21 Dianzier Road, Xi'an, China, 710065;

    rnTubular Goods Research Institute of CNPC,21 Dianzier Road, Xi'an, China, 710065;

    rnTubular Goods Research Institute of CNPC,21 Dianzier Road, Xi'an, China, 710065;

    rnTubular Goods Research Institute of CNPC,21 Dianzier Road, Xi'an, China, 710065;

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  • 正文语种 eng
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