Simulating structure-forming processes in tube steels during controlled rolling with accelerated cooling

Matrosov, Yu. I.; Kichkina, A. A.; Ефимов, А. А.; Éfron, L. I.; Bagmet, O. A.

doi:10.1007/s11015-007-0068-3

Cited by 8 publications

(1 citation statement)

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“…Strength and crack resistance of pipeline steel are predominantly determined by its textural and structural state. A transition from ferrite-pearlite microstructures (average ferrite grain size ~5 µm) to structures with prevailing products of diffusionless transformation (primarily bainite; average grain size ~1 µm [6]) obtained by austenite overcooling by means of alloying and rapid cooling has allowed to carry out a transition from X52-X65 to X70-X80 and subsequently to X100 grades [11,[15][16][17]. In [18], grain refinement is stated to be the only factor that ensures a simultaneous increase in strength and toughness of a material.…”

Section: Introductionmentioning

confidence: 99%

Tensile Deformation and Fracture Behavior of API-5L X70 Line Pipe Steel

Лобанов

Хотинов

Urtsev³

et al. 2022

Materials

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Thermo-mechanical controlled processing (TMCP) is employed to obtain the required level of mechanical properties of contemporary HSLA steel plates utilized for gas and oil pipeline production. The strength and crack resistance of pipeline steels are mainly determined by its microstructure and crystallographic texture. In this study, the influence of the structural and textural states of industrially produced API-5L X70-X80 pipeline steels on tensile mechanical properties was analyzed. TMCP routes with different hot rolling temperatures and cooling rates were employed. The texture of steel was assessed using the Taylor factor, which was calculated based on electron backscatter diffraction (EBSD). The decrease in rolling temperature resulted in the sharper texture characterized by {001} planes banding (cleavage planes in the bcc lattice) parallel to rolling direction. The tensile deformation behavior at the stage of necking was determined by the crystallographic and morphological texture of the material and demonstrated significant anisotropy. Rupture of all investigated samples was accompanied by the development of splitting on the fracture surface. The splitting was localized in the rolling plane similar to the splitting in standard Charpy tests of pipeline steels.

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