Tensile deformation behavior of ferrite-bainite dual-phase pipeline steel

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

doi:10.1016/j.msea.2021.142230

Cited by 33 publications

(16 citation statements)

References 43 publications

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“…In the present study, the interested prior austenite was reconstructed using the MATLAB toolbox, [ 41 ] and the theoretical (001)γ stereographic projections on which the <001> directions α with a K–S OR to γ are presented in Figure 10 c and 11 c. Based on the calculated results, the {100} theoretical pole figure of the 24 K–S variants could be plotted and then rotated to coincide with the experimental results (Figure 10d and 11d).…”

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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“…The GND represents the distortion of crystal lattice which can be introduced by volume expansion and lattice rotation during transformation and deformation. [ 25,33 ] Tu et al [ 34 ] pointed that the formation and annihilation of GND could affect the distribution of stress and strain during tensile process, resulting in affecting the work hardening behavior. The phase maps and GND distribution maps are shown in Figure 11 .…”

Section: Discussionmentioning

confidence: 99%

Significance of Retained Austenite Stability on Yield Point Elongation Phenomenon in a Hot‐Rolled and Intercritically Annealed Medium‐Mn Steel

Dong

et al. 2022

steel research int.

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The effect of retained austenite stability on yield point elongation (YPE) phenomenon in a hot‐rolled and intercritically annealed medium‐Mn steel is elucidated here. Furthermore, the influencing factors of austenite reversion are studied. The results indicate that the shear phase transition is suppressed by the strain hardening of prior austenite grain introduced by low‐temperature rolling, resulting in refined martensite laths with high dislocation density. The nucleation and growth of intercritical austenite are accelerated by high‐density dislocation substructures. Different characteristics of retained austenite (RA) are obtained through tailoring the rolling temperature and austenite reversion transformation (ART) process. YPE phenomenon is a result of the equilibrium between work hardening (via martensitic transformation and dislocation multiplication) and softening (by stress relaxation and dislocation glide). In the initial deformation stage, large amounts of geometrically necessary dislocations (GND) are “stored” in the RA with higher stability, and the local stress can be effectively relaxed and transferred, leading to the occurrence of YPE. The optimum properties are obtained in R760‐A630‐0.3h samples with a combination of yield strength of 918 MPa, tensile strength of 1019 MPa, and total elongation of 25.3%, which is mainly attributed to the finer ferrite matrix and sustained transformation‐induced plasticity effect.

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“…Obviously, the loading directions can distinguish the orientation rotation behavior of 409 L FSS, that is, the orientation of tensile axis determines the rotation behavior in the tensile test. It is believed that 〈101〉 orientation is a stable end orientation during uniaxial tension of BCC metals [22]. A comparison of the rotational behavior of tensile axis between two low-carbon steel [20] specimens indicates that different slip activities may result in different rotation behaviors of the two specimens.…”

Section: Evolution Of Crystallographic Texturementioning

confidence: 99%

In-situ EBSD study of 409 L ferritic stainless steel during tensile testing

Chen

Jun-an²

2022

Mater. Res. Express

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Two ferritic stainless steel (FSS) specimens, denoted as loading axis along the rolling direction(LR) and the transverse direction(LT) respectively, were produced to elucidate the mechanical anisotropyof409L FSS at grain scale. This approach was realized by the combination of in-situ tensile test and field emission scanning electron microscopy (SEM) with electron backscattering diffraction (EBSD) at room temperature. Microstructure evolution, grain orientation rotation, and crystallographic slip were investigated in the tensile test. During tensile deformation, the tensile axis of LR specimens rotated towards the <101> direction, which is the stable end orientation of body-centered cubic (BCC) metals. However, the rotation of tensile axis towards <101> was restrained in LT specimens due to the operation of less favorable slip systems. {110}<111> was the most favorable slip system in both specimens. The mechanical anisotropy in grain scale is due to different slip behaviors of LR and LT specimens.

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Tensile deformation behavior of ferrite-bainite dual-phase pipeline steel

Cited by 33 publications

References 43 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

Significance of Retained Austenite Stability on Yield Point Elongation Phenomenon in a Hot‐Rolled and Intercritically Annealed Medium‐Mn Steel

In-situ EBSD study of 409 L ferritic stainless steel during tensile testing

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