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首页> 外文期刊>Metals and Materials International >Assessment of the Crack Growth Characteristics at the Low CorrosionFatigue Limit of an A106 Gr B Steel Pipe Weld
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Assessment of the Crack Growth Characteristics at the Low CorrosionFatigue Limit of an A106 Gr B Steel Pipe Weld

机译：A106 Gr B钢管焊缝在低腐蚀极限下的裂纹扩展特性评估

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摘要

In the area of heavy construction, welding processes are vital in the production and maintenance of pipelinesand power plants. The fusion welding process generates formidable welding residual stresses and met-allurgical change, which increase the crack driving force and reduce the resistance of brittle fractureas well as environmental fracture. This is a serious problem with many alloys as well as A106 GrB steel pipe. This pipe, used in petrochemical and heavy chemical plants, either degrades due to corrosiveenvironments, e.g., chlorides and sulfides, and/or becomes damaged during service due to the variouscorrosion damage mechanisms. Thus, in this study, the sulfide corrosion fatigue strength of multi-passwelded A106 Gr B steel pipe was evaluated in a 5.0 wt.% NaCl solution that was saturated with H_2S gas at room temperature on the basis of NACE TM 0177-90. The crack growth characteristics of thewelded pipe were then assessed at the low limit of sulfide corrosion fatigue strength, which was previouslyobtained from the sulfide corrosion fatigue (SCF) tests. From the results, in terms of the SCF, all thespecimens failed at the heat-affected zone, where a high welding residual stress distributes. It was foundthat the fatigue crack grew at the low corrosion fatigue limit σ_(SCFun-notched), which was 32 % (160MPa)of the ultimate tensile strength (502MPa) of the welded specimens.
机译：在重型建筑领域，焊接工艺对管道和发电厂的生产和维护至关重要。熔焊过程产生强大的焊接残余应力和冶金变化，从而增加了裂纹驱动力并降低了脆性断裂和环境断裂的抵抗力。对于许多合金以及A106 GrB钢管来说，这是一个严重的问题。在石油化工厂和重化工厂中使用的该管或者由于诸如氯化物和硫化物的腐蚀性环境而退化，和/或由于各种腐蚀破坏机理而在使用期间被破坏。因此，在这项研究中，在NACE TM 0177-90的基础上，在室温下用H_2S气体饱和的5.0 wt％NaCl溶液中，对多通道A106 Gr B钢管的硫化物腐蚀疲劳强度进行了评估。然后在硫化物腐蚀疲劳强度的下限下评估焊接管的裂纹扩展特性，该极限是先前通过硫化物腐蚀疲劳（SCF）测试获得的。从结果来看，就SCF而言，所有标本都在热影响区域失效，该区域分布着较高的焊接残余应力。结果表明，疲劳裂纹在较低的腐蚀疲劳极限σ_（SCFun-notched）处出现，这是焊接试样的极限抗拉强度（502MPa）的32％（160MPa）。

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