Tensile deformation damage behavior of a high deformability pipeline steel with a ferrite and bainite microstructure

Tu, Xingyang; Shi, Xianbo; Shan, Yiyin; Yan, Wei; Shi, Quanqiang; Li, Yanfen; Li, Changsheng; Yang, Ke

doi:10.1016/j.msea.2020.139889

Cited by 29 publications

(11 citation statements)

References 38 publications

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“…Thus, the yield strength is determined by the soft phase in the multiphase structure. [ 43,44 ] As shown in Figure 2, the hardness of bainite in the AT320 sample was 422.8 HV, whereas that in the AT360 sample was only 379.8 HV. Therefore, the yield strength of the AT360 sample was lower.…”

Section: Discussionmentioning

confidence: 99%

Microstructure of Ultrafine Acicular Bainite and Mechanical Properties of 3Cr2MnNiMo Mold Steel during Austempering

Ren

et al. 2022

steel research int.

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Herein, the effect of austempering treatment on martensite/bainite multiphase microstructure evolution and mechanical properties of 3Cr2MnNiMo mold steel are investigated, and the mechanical properties are compared with the conventional quenching and tempering (QT) treatment. It indicated that the morphology of martensite/bainite can be effectively tailored by changing the austempering temperature. With the increase of temperature from 280 to 360 °C, the microstructure changes from tempered martensite + bainite + blocky retained austenite (RA) to martensite + coarse bainite plate + blocky RA and irregular martensite/austenite (M/A) island. When the temperature reaches 420 °C, the martensite content reaches the maximum. The bainite morphology is surprisingly transformed from coarse bainite plate to ultrafine acicular shape owing to the reduction of the bainitic driving force and the sharp increase of carbon diffusion coefficient. Moreover, blocky RA and M/A islands disappear and are replaced by nanoscale filmy RA. The alternating distribution of variants has a refinement effect on the microstructure and the effective grain size reaches a minimum value. Compared with the conventional QT treatment, the tensile strength of austempering at 420 °C increased by 702 MPa, but the toughness and ductility levels are almost the same.

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Section: Discussionmentioning

confidence: 99%

Microstructure of Ultrafine Acicular Bainite and Mechanical Properties of 3Cr2MnNiMo Mold Steel during Austempering

Ren

et al. 2022

steel research int.

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“…Furthermore, the KAM maps ( Figure 3 c,f,i) show that the strain is mainly distributed in the bainite and pearlite phase with large lattice distortion; the average KAM value decreased with the introduction of polygonal ferrite and pearlite phases. The geometrically necessary dislocation (GND) density can be estimated with KAM values from Equation (4) [ 24 ]:

where μis the unit length, b is Burgers vector, and θ is the misorientation angle. As shown in Figure 4 b, the density of GNDs in single-phase, dual-phase, and triple-phase samples is 4.93 × 10 14 /m 2 , 4.01 × 10 14 /m 2 , and 2.55 × 10 14 /m 2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Strain Capacity by the Introduction of Pearlite in Bainite and Polygonal Ferrite Dual-Phase Pipeline Steel

Ren²,

Shi

et al. 2021

Materials

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In this study the strain capacity and work-hardening behavior of bainite (B), bainite + polygonal ferrite (B + PF), and bainite + polygonal ferrite + pearlite (B + PF + P) microstructures are compared. The work hardening exponent (n), instantaneous work hardening value (ni), and differential Crussard-Jaoul (DC-J) analysis were used to analyze the deformation behavior. The best comprehensive mechanical properties were obtained by the introduction of the pearlite phase in B + PF dualphase with the tensile strength of 586 MPa and total elongation of 31.0%. The additional pearlite phase adjusted the strain distribution, which increased the initial work hardening exponent and then maintained the entire plastic deformation at a high level, thus delayed necking. The introduction of pearlite reduced the risk of micro-void initiation combined with the high frequency of high angle grain boundaries (HAGBs) in triple-phase steel, which led to a low crack propagation rate.

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“…Grains with low values of Taylor factor are considered to have "soft" orientations with regard to the given loading direction, favoring the slip activation. Conversely, those grains with high values of Taylor factor are considered to have "hard" orientations with regard to the given loading direction, which is less likely to yield [37]. As shown in Figure 7e,f, a grain colored with blue (Taylor factor with low value) and red (Taylor factor with high value) was marked by white arrows, respectively, and it was found that the grain colored either by blue or by red corresponded to the packet in Figure 7a,b.…”

Section: Discussionmentioning

confidence: 99%

Effects of the Primary NbC Elimination on the SSCC Resistance of a HSLA Steel for Oil Country Tubular Goods

et al. 2021

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Sulfide stress corrosion cracking (SSCC) has been of particular concern in high strength low alloyed (HSLA) steels used in the oil industry, and the non-metallic inclusions are usually considered as a detrimental factor to the SSCC resistance. In the present work, continuous casting (CC) and electroslag remelting (ESR) were adopted to fabricate a 125 ksi grade steel in order to evaluate the effect of microstructure with and without primary NbC carbides (inclusions) on the SSCC resistance in the steel. It was found that ESR could remove the primary NbC carbides, and hence, slightly increase the strength without deteriorating the SSCC resistance. The elimination of primary NbC carbides caused two opposite effects on the SSCC resistance in the studied steel. On the one hand, the elimination of primary NbC carbides increased the dislocation density and the proportion of high angle boundaries (HABs), which was not good to the SSCC resistance. On the other hand, the elimination of primary NbC carbides also induced more uniform nanosized secondary NbC carbides formed during tempering, providing many irreversible hydrogen traps. These two opposite effects on SSCC resistance due to the elimination of primary NbC carbides were assumed to be offset, and thus, the SSCC resistance was not greatly improved using ESR.

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Tensile deformation damage behavior of a high deformability pipeline steel with a ferrite and bainite microstructure

Cited by 29 publications

References 38 publications

Microstructure of Ultrafine Acicular Bainite and Mechanical Properties of 3Cr2MnNiMo Mold Steel during Austempering

Microstructure of Ultrafine Acicular Bainite and Mechanical Properties of 3Cr2MnNiMo Mold Steel during Austempering

Enhancing Strain Capacity by the Introduction of Pearlite in Bainite and Polygonal Ferrite Dual-Phase Pipeline Steel

Effects of the Primary NbC Elimination on the SSCC Resistance of a HSLA Steel for Oil Country Tubular Goods

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