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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Thermomechanically Controlled Processing on Microstructure and Hydrogen?Induced Cracking Susceptibility of API 5L X70 Pipeline Steel
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Influence of Thermomechanically Controlled Processing on Microstructure and Hydrogen?Induced Cracking Susceptibility of API 5L X70 Pipeline Steel

机译：热机控加工对微观结构和氢气的影响？API 5L X70管道钢的裂解敏感性

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The effect of?different thermomechanical controlled processing routes on susceptibility of X70 pipeline steel to hydrogen?induced cracking (HIC) have been studied. Two X70 pipeline steel specimens labelled WE and WD were investigated. These?specimens have the same chemical composition, but they were processed with seperate thermomechanical treatments?parameters. Microstructural examinations showed that WE consists of mainly acicular ferrite and polygonal ferrite, while WD consists of acicular ferrite and bainitic ferrite. After subjecting both specimens to hydrogen charging for 12 and 16?h in 0.2?M sulfuric acid and 3?g/L ammonium thiocyanate, early onset of HIC was observed?in specimen WD. Post-hydrogen charging microstructural evaluation showed the nucleation of discontinuous cracks in WD after 12?h of charging. However, extended charging for up to 16?h resulted in HIC along the mid-thickness region of both specimens. Hydrogen diffusion across specimen WE was better than that of specimen WD. Therefore, hydrogen trapping at grain boundaries, banded deformed grains, inclusions and secondary phases such as martensite and cementite aided initiation and propagation of HIC in specimens. Nevertheless, the adverse effect of these features on HIC risks was more prominent in specimen WD compared to specimen WE. The Vickers microhardness values measured in WD (349.6 HV) and WE (307.4 HV) suggest that WD is harder than WE; and higher kernel average misorientation of 0.66° in WD than in WE (0.58°) shows higher dislocation density in WD. The results from slow?strain?rate tensile test confirmed that specimen WD was stronger and more susceptible to HIC than specimen WE. It was concluded that microstructural phases developed during thermomechanical processing improved strength in WD at the expense of its crack?resistance, while WE with lower strength showed more ductility and higher resistance to HIC.
机译：不同的热机械控制处理路径对X70管线钢对氢气的敏感性的影响？诱导裂解（HIC）。调查了两种X70管道钢标本，被调查了我们和WD。这些？样本具有相同的化学组成，但它们被分离热机械处理处理了吗？参数。微观结构考试表明，我们主要由针状铁氧体和多晶硅纹组成，而WD由针状铁氧体和贝氏体铁氧体组成。在0.2μm硫酸和3μl硫氰酸盐中，将标本与氢气充电进行12和16ΩH后，观察到HIC的早期发作？在标本WD。后氢气充电微结构评估显示12〜H充电后WD中的不连续裂缝的成核。然而，延长充电最多16ΩH，导致两个样本的中厚区域的HIC。跨样品的氢气扩散优于标本WD。因此，在晶界，带状变形颗粒，夹杂物和二次阶段的氢捕获，例如马氏体和渗碳盐在样品中HIC的引发和繁殖。然而，与试样的标本Wd，这些特征对HIC风险的不利影响与试样有关。在WD（349.6HV）中测量的维克斯显微硬度值，我们（307.4 HV）表明WD比我们更难;与WD中的0.66°的核心平均误差高于我们（0.58°）显示WD中的脱位密度较高。来自慢的结果？菌株的速率拉伸试验证实，样品WD较强，更容易受到HIC的样本。得出结论是，在热机械加工过程中产生的微观结构阶段在其裂缝的抗裂纹中提高了强度的强度？耐受性，而我们具有较低强度的抗性显示出更多的延展性和更高的HIC抗性。

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