Fracture toughness assessment at different temperatures and regions within a friction stirred API 5L X80 steel welded plates

Ávila, Julián A.; Ruchert, Cassius Olívio Figueiredo Terra; Mei, Paulo Roberto; Marinho, Ricardo Reppold; Paes, Marcelo Torres Piza; Ramírez, Antonio J.

doi:10.1016/j.engfracmech.2015.08.006

Cited by 33 publications

(26 citation statements)

References 11 publications

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“…The ACC-steel plates were machined from a pipe, a finished product, while AIR-steel plates came directly from TMCP plate production. For AIR-steel, a further U-O-E process would be necessary to transform plates into tubes, which would promote enough work-hardening to reach the yield stress of X80-grade specification [24]. Also, the YS/UTS ratio was not the predominant factor affecting the fracture toughness, where usually high YS/ UTS ratios lead to low toughness, however, in this study high YS/UTS lead to high toughness.…”

Section: Tensile Testsmentioning

confidence: 64%

“…Delamination is a brittle fracture behavior reported in TMCP steels [9,17,[22][23][24][25], which occurs at the weakest interface, usually near the crack tip. There are two types of delamination based on its geometry: (i) crack divider and (ii) crack arrester.…”

Section: Introductionmentioning

confidence: 99%

“…However, it reallocates the crack at a region with no plastic zone ahead of the crack, triggering the re-initiation of the crack under conditions of nearly uniaxial tension, resulting in high absorption of energy [22,23]. There are several reports of delaminations of both types in Charpy tests in the literature [9,17,[23][24][25] and few reports of delaminations during CTOD tests in the literature [8].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Textures and Microstructures on the Occurrence of Delamination during and after Fracture Toughness Tests of API X80 Steel Plates

Conde¹,

Pinto²,

Masoumi³

et al. 2020

Strength of Materials

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The API 5 L X80 is a high strength microalloyed steel, widely used in the gas and oil industry to fabricate pipelines. This steel presents a combination of elevated strength and toughness. In the present investigation, the microstructural features, fracture toughness and delamination occurrence of two X80 grade steel plates with different processing routes and chemical composition were studied. The first steel depicted a homogenous bainitic matrix and the second steel exhibited a banded microstructure composed of elongated ferrite grains, with macrosegregation in the mid-plane of the plates. Fracture toughness tests were conducted for both steels on 7-mm and 15-mm thick samples. The orientation distribution functions analysis revealed crystallographic intensity distribution of the austenite to ferrite transformation texture, especially the alpha-fiber (< 011 > || rolling direction) which explained the anisotropy and delamination occurrences. Both processed plates of steel presented the alpha-fiber due to hot-rolling of plates. Delaminations occurrences were further investigated and attributed to a strong {100} <011> orientation presence despite microstructure homogeneity. A schematic model was proposed, showing the source of delamination and the reason for the lowest toughness for 45° to the rolling direction.

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Section: Tensile Testsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Textures and Microstructures on the Occurrence of Delamination during and after Fracture Toughness Tests of API X80 Steel Plates

Conde¹,

Pinto²,

Masoumi³

et al. 2020

Strength of Materials

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“…The applied load depends of the chosen device, thickness and the geometry of the specimen, and yield stress of the material. Figure 1 shows the SE(B) specimens geometry and dimensions from a API X80 steel two-passes FSW joint; more details about the welding procedures and fracture toughness results could be consulted elsewhere [59]. The notches were located at the stirred zone within the FSW joint.…”

Section: Weldment Samples Precrackingmentioning

confidence: 99%

Guide for Recommended Practices to Perform Crack Tip Opening Displacement Tests in High Strength Low Alloy Steels

Ávila

Lima²,

Ruchert

et al. 2016

Soldag. insp.

Self Cite

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Fracture mechanics approach is important for all mechanical and civil projects that might involve cracks in metallic materials, and especially for those using welding as a structural joining process. This methodology can enhance not only the design but also the service life of the structures being constructed. This paper includes detailed consideration of several practical issues related to the experimental procedures to assess the fracture toughness in high strength low alloy steels (HSLA) using the crack tip opening displacement (CTOD) parameter, specifically pipeline steels for oil and gas transportation. These considerations are important for engineers who are new in the field, or for those looking for guidelines performing different procedures during the experimentation, which usually are difficult to understand from the conventional standards. We discuss on topics including geometry selection, number of replicate tests, fatigue precracking, test procedure selection and realization, reports of results and other aspects.

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“…More recently, Avila et al [7], analysed the fracture toughness of API5LX80 steel in butt joints welded in two passes by FSW till -20 degrees with good results for pipeline applications, For shipbuilding applications McPerson et al [8] compared fatigue behaviour of submerged arc and friction stir weld in DH36 concluding on am improved performance of the later, Azevedo et al [9] analysed fatigue behaviour in friction stir welded 4mm thick GL-A 36 steel, while Pandley and Gupta [10] studied fatigue growth of mild steel plate welded by friction stir welding and concluded that the growth rate in the welded material is lower than in the base material. Nathan et al [11] confirmed the superior mechanical properties in naval grade high strength alloy (HSLA) when welded with FSW in comparision with arc welding as GMA and SMA.…”

Section: Friction Stir Welding Of Shipbuilding Steel With Primermentioning

confidence: 99%

Friction Stir Welding of Shipbuilding Steel with Primer

Azevedo¹,

Quintino²,

Infante

et al. 2016

Soldag. insp.

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Friction Stir Welding has proven its merits for welding of aluminium alloys and is focused in expanding its material database to steel and titanium and also to assess new joint configurations. The use of welded structures in shipbuilding industry has a long tradition and continuously seeks for innovation in terms of materials and processes maintaining, or even, reducing costs. Several studies have been performed in the past years on FSW of steel. However, just recently were reported defect-free welds, free of martensite with stable parameters in steel without Primer. FSW of steel with primer has not been addressed. This work aims to fulfil a knowledge gap related to the use of friction stir for welding shipbuilding steel by analysing the effect of welding parameters on the metallurgical characteristics and mechanical properties of welds obtained with an innovative FSW tool in joining steel plates with a primer. Welds were performed in 4mm thick GL-A36 steel plates painted with a zinc based primer followed by a detailed microscopic, chemical and mechanical analysis. The results that matching fatigue properties are obtained using this technique, in FSW of shipbuilding steel with Primer.

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Fracture toughness assessment at different temperatures and regions within a friction stirred API 5L X80 steel welded plates

Cited by 33 publications

References 11 publications

Effect of Textures and Microstructures on the Occurrence of Delamination during and after Fracture Toughness Tests of API X80 Steel Plates

Effect of Textures and Microstructures on the Occurrence of Delamination during and after Fracture Toughness Tests of API X80 Steel Plates

Guide for Recommended Practices to Perform Crack Tip Opening Displacement Tests in High Strength Low Alloy Steels

Friction Stir Welding of Shipbuilding Steel with Primer

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