Microstructural Evolution of SK85 Pearlitic Steel Deformed by Heavy Cold Rolling

Yang, Caiding; Liu, Ye; Zhou, G.Y.; Zou, Xingli; Lu, Xionggang; Cao, Guanghui

doi:10.3390/ma15238405

Cited by 4 publications

(1 citation statement)

References 37 publications

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“…Probably both are operative at the micro-and nano-scale and a combination of them could take place. In addition, in these micro-and nano-levels, hydrogen transport by dislocations [77][78][79][80][81] would be operative over distances below the pearlite interlamellar spacing (nano-scale). At the macro-scale, stress-and-strain-assisted diffusion of hydrogen predominates in pearlite over the hydrogen transport by dislocations [82].…”

Section: Evolution (Sub-modes) Of Hamd In Pearlitic Steelmentioning

confidence: 99%

Hydrogen-Assisted Microdamage of Eutectoid Pearlitic Steel in the Presence of Notches: The Tearing Topography Surface

Toribio

2023

Metals

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This paper studies the hydrogen-assisted microdamage (HAMD) in fully-pearlitic steel. A detailed analysis is provided of the HAMD region in axisymmetric round-notched samples of high-strength eutectoid pearlitic steel under hydrogen embrittlement environmental conditions. The microscopic appearance and evolution of the hydrogen affected region is analyzed from the initiation (sub-critical) to the fracture (critical) situations. The use of very distinct notched samples and their associated stress distributions in the vicinity of the notch tip allows for a study of the key role of the triaxial stress state on hydrogen diffusion and micro-cracking (or micro-damage). The microscopic appearance of the hydrogen-affected zone (the so-called tearing topography surface) resembles micro-damage, micro-cracking or micro-tearing at a micro- or nano-scale due to hydrogen degradation, thus affecting the notch tensile strength and producing hydrogen embrittlement. A micromechanical model is proposed to explain these hydrogen effects on the material on the basis of the lamellar micro- and nano-structure of the pearlitic steel.

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Section: Evolution (Sub-modes) Of Hamd In Pearlitic Steelmentioning

confidence: 99%

Hydrogen-Assisted Microdamage of Eutectoid Pearlitic Steel in the Presence of Notches: The Tearing Topography Surface

Toribio

2023

Metals

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Role of Cerium on the Intricacies of Deformed State and Softening Mechanisms of Low‐Carbon Steels

Kadgaye,

Ansari,

Hasan

et al. 2024

steel research int.

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The present study investigates the softening kinetics of two cerium (Ce)‐modified steels after 60% cold rolling and annealing at 600 °C for 2–16 h. Cold rolling accumulates substantial strain in the ferritic matrix of low Ce (LCe) steel (0.03 wt% Ce) compared to high Ce (HCe) steel (0.6 wt% Ce). The acicular ferrite and Fe3C partition the imposed strain preferentially inside the ferrite matrix of LCe sample. Contrarily, a homogenous strain distribution in HCe sample is promoted by soft Ce2O3 particles embedded in ferrite. Both the steels achieve partial recovery and recrystallization even after 16 h of annealing. LCe steel experiences a softening fraction of ≈28 vol% after 16 h, inferior to HCe steel (≈34 vol%). During initial stage of annealing, nucleation of strain‐free grains are observed in LCe sample due to availability of grain and interphase boundaries. Subsequently, recrystallization kinetics get delayed because of the pinning effect exerted by fine CeO2 and Fe3C particles. In HCe samples, the early stage of ferrite nucleation is hindered by the segregation of Ce at grain boundaries. However, at a later stage, the recrystallization kinetics are accelerated owing to the ineffective pinning of dislocations and boundaries by coarse Ce2Fe17 and Ce2C3 particles.

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Experimental Analysis of Wire Drawing Influence on Microstructure, Texture, and Mechanical Properties of High‐Carbon Steel for Prestressing Strand

Meriem,

Zidani,

Boutefnouchet

et al. 2024

steel research int.

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The study aims to explore high‐carbon steel's behavior during cold drawing, focusing on the link between microstructural changes, texture, and mechanical properties at different strain levels. Using X‐ray diffraction, scanning electron microscopy–electron backscatter diffraction, micro‐ and nanoindentation, and wear analysis, findings show that grain size and interlamellar spacing decrease as strain increases, and pearlitic colonies become more compact and aligned. This refinement leads to significant hardening, from 333.8 HV in the wire rod to 470.4 HV at 2.05 strain, aligning with the Hall–Petch law. The <110> fiber texture develops linearly, and a higher dislocation density is noted at lower strain rates, with low‐angle grain boundaries increasing from 65.2% to 76.5%. The cold drawing process is thus divided into two phases, marked by a shift from low‐angle grain boundaries dominance and a notable reduction in wear rate compared to severely deformed states.

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Microstructural Evolution of SK85 Pearlitic Steel Deformed by Heavy Cold Rolling

Cited by 4 publications

References 37 publications

Hydrogen-Assisted Microdamage of Eutectoid Pearlitic Steel in the Presence of Notches: The Tearing Topography Surface

Hydrogen-Assisted Microdamage of Eutectoid Pearlitic Steel in the Presence of Notches: The Tearing Topography Surface

Role of Cerium on the Intricacies of Deformed State and Softening Mechanisms of Low‐Carbon Steels

Experimental Analysis of Wire Drawing Influence on Microstructure, Texture, and Mechanical Properties of High‐Carbon Steel for Prestressing Strand

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