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Quantification and microstructural origin of the anisotropic nature of the sensitivity to brittle cleavage fracture propagation for hot-rolled pipeline steels

机译:热轧管钢脆性切割裂缝繁殖敏感性各向异性性质的定量和微观结构来源

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摘要

This work proposes a quantitative relationship between the resistance of hot-rolled steels to brittle cleavage fracture and typical microstructural features, such as microtexture. More specifically, two hot-rolled ferritic pipeline steels were studied using impact toughness and specific quasistatic tensile tests. In drop weight tear tests, both steels exhibited brittle out-of-plane fracture by delamination and by so-called "abnormal" slant fracture, here denoted as "brittle tilted fracture" (BTF). Their sensitivity to cleavage cracking was thoroughly determined in the fully brittle temperature range using round notched bars, according to the local approach to fracture, taking anisotropic plastic flow into account. Despite limited anisotropy in global texture and grain morphology, a strong anisotropy in critical cleavage fracture stress was evidenced for the two steels, and related through a Griffith-inspired approach to the size distribution of clusters of unfavorably oriented ferrite grains (so-called "potential cleavage facets"). It was quantitatively demonstrated that the occurrence of BTF, as well as the sensitivity to delamination by cleavage fracture, is primarily related to an intrinsically high sensitivity of the corresponding planes to cleavage crack propagation across potential cleavage facets.
机译:该工作提出了热轧钢的电阻与脆性切割骨折和典型微观结构特征之间的定量关系,例如微卷尺。更具体地,使用冲击韧性和特定的Quasistatic拉伸试验研究了两个热轧铁素体管道钢。在滴减轻撕裂试验中,两个钢通过分层表现出脆性外平面骨折,通过所谓的“异常”倾斜骨折,这里表示为“脆性倾斜骨折”(BTF)。根据局部裂缝的裂缝释放的骨折,它们在完全脆性温度范围内彻底测定它们对裂解裂化的敏感性。考虑各向异性塑料流动。尽管全球纹理和晶粒形态存在有限的各向异性,但两个钢的关键裂解骨折应力的强烈各向异性都证明了这两种钢,并且通过Griffith激发方法与不利的铁氧体谷物(所谓的“潜力的群体的大小分布切割方面“)。定量表明,BTF的发生,以及通过切割裂缝的分层的敏感性主要是与相应平面的内在高灵敏度相关,以在潜在的裂解方面裂解裂缝膨胀。

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