Improvement of Charpy impact properties in heat affected zones of API X80 pipeline steels containing complex oxides

Shin, Sang Yong; Oh, K. J.; Kang, Ki-Weon; Lee, S.

doi:10.1179/174328409x425218

Cited by 7 publications

(6 citation statements)

References 13 publications

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“…Most of AFs are easily formed around oxides, as oxides provide nucleation sites for AF. [8][9][10][11] Oxides cannot play a role sufficiently as crack or void initiation sites, because they are surrounded by tough AFs. [16] Thus, the reason why the fracture toughness increases with increasing no.…”

Section: Discussionmentioning

confidence: 99%

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Effects of Oxides on Tensile and Charpy Impact Properties and Fracture Toughness in Heat Affected Zones of Oxide-Containing API X80 Linepipe Steels

Sung

Sohn

Shin

et al. 2014

Metall Mater Trans A

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This study is concerned with effects of complex oxides on acicular ferrite (AF) formation, tensile and Charpy impact properties, and fracture toughness in heat affected zones (HAZs) of oxidecontaining API X80 linepipe steels. Three steels were fabricated by adding Mg and O 2 to form oxides, and various HAZ microstructures were obtained by conducting HAZ simulation tests under different heat inputs. The no. of oxides increased with increasing amount of Mg and O 2 , while the volume fraction of AF present in the steel HAZs increased with increasing the no. of oxides. The strengths of the HAZ specimens were generally higher than those of the base metals because of the formation of hard microstructures of bainitic ferrite and granular bainite. When the total Charpy absorbed energy was divided into the fracture initiation and propagation energies, the fracture initiation energy was maintained constant at about 75 J at room temperature, irrespective of volume fraction of AF. The fracture propagation energy rapidly increased from 75 to 150 J and saturated when the volume fraction of AF exceeded 30 pct. At 253 K (À20°C), the total absorbed energy increased with increasing volume fraction of AF, as the cleavage fracture was changed to the ductile fracture when the volume fraction of AF exceeded 45 pct. Thus, 45 vol pct of AF at least was needed to improve the Charpy impact energy, which could be achieved by forming a no. of oxides. The fracture toughness increased with increasing the no. of oxides because of the increased volume fraction of AF formed around oxides. The fracture toughness did not show a visible correlation with the Charpy absorbed energy at room temperature, because toughness properties obtained from these two toughness testing methods had different significations in view of fracture mechanics.

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Section: Discussionmentioning

confidence: 99%

“…[7,8] Alloying elements such as Mg, Ti, and Al work effectively for oxide formation, and oxides formed by combining these alloying elements act as nucleation sites for fine AF during the austeniteferrite transformation. [9][10][11][12] Larger size and no. of oxides are more effective for the formation of AF.…”

Section: Introductionmentioning

confidence: 99%

Effects of Oxides on Tensile and Charpy Impact Properties and Fracture Toughness in Heat Affected Zones of Oxide-Containing API X80 Linepipe Steels

Sung

Sohn

Shin

et al. 2014

Metall Mater Trans A

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“…57(c) observam-se possivelmente carbonetos de cor cinza escura assinalado pela circunferência de cor preta, além dos agregados euteóides de cor preta entre os grãos da ferrita. A microestrutura do tubo sem tratamento térmico é composta por uma matriz ferrítica com dispersão de martensitaaustenita retida (MA), cementita e heterogeneidade de tamanho de grão [51,52]. …”

Section: Posição 2 (Orientação L-t) No Metal De Baseunclassified

“…Esta microestrutura apresenta AF, ferrita bainitica (BF) e bainita granular (GB). Shin [52] simulou um ciclo térmico de solda a uma temperatura de 1400 0 C para um aço API 5L grau X80 obtendo uma microestrutura composta de AF, BF, e GB . A GB grosseira é formada em taxas de resfriamento baixas.…”

Section: Posição 2 (Orientação L-t) Simulação De Um úNico Passeunclassified

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Simulação física e caracterização de zonas afetadas pelo calor de aços API 5L grau X80.

Chávez¹,

Franko²

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API 5L Grade X80 steel are high strength low alloy steels (HSLA) used in the manufacture of pipes for transporting oil and gas by pipelines. API 5L X80 pipes are characterized by having excellent mechanical properties such as tensile strength, toughness, ductility, corrosion resistance, and good weldability. These pipes bring many benefits, for example, the economic factor related to the good mechanical strength of these tubes which can be produced with smaller wall thicknesses. This reduction in thickness lowers costs for transportation, construction, welding and installation. In addition, these tubes can be fabricated with large diameters, allowing the transport of large amounts of fluids at high pressures and flow rates. The toughness gives, to this material, the

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Effect of Al on the Formation of IAF in Al–Ti–Mg Deoxidized and RE-Treated Steel

Cui

Song

Liu

et al. 2019

The Minerals, Metals &Amp; Materials Series

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Improvement of Charpy impact properties in heat affected zones of API X80 pipeline steels containing complex oxides

Cited by 7 publications

References 13 publications

Effects of Oxides on Tensile and Charpy Impact Properties and Fracture Toughness in Heat Affected Zones of Oxide-Containing API X80 Linepipe Steels

Effects of Oxides on Tensile and Charpy Impact Properties and Fracture Toughness in Heat Affected Zones of Oxide-Containing API X80 Linepipe Steels

Simulação física e caracterização de zonas afetadas pelo calor de aços API 5L grau X80.

Effect of Al on the Formation of IAF in Al–Ti–Mg Deoxidized and RE-Treated Steel

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