In situ study of cementite deformation and its fracture mechanism in pearlitic steels

Zhao, Yonggang; Tan, Yuanbiao; Ji, Xiaoxiao; Xiang, Zijie; He, Yue; Xiang, Song

doi:10.1016/j.msea.2018.05.114

Cited by 30 publications

(12 citation statements)

References 29 publications

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“…Regardless of the quenching temperature used, the cementite microstructure in the tempered martensite occurred in the form of elliptical particles or short rods, and was dispersed on the TM matrix. The measurement results clearly indicate that the interlamellar spacing (ILS) equaled 98 ± 10 nm and the minor axis of the cementite feature equaled 45 ± 8 nm, where the parameters were measured under edge-on conditions [21,22,23,24]. Moreover, it is interesting to note that the lamellar orientation of the adjacent pearlitic colonies appeared to grow symmetrically at higher quenching temperatures—at 190 °C, for instance.…”

Section: Resultsmentioning

confidence: 84%

Microstructure Transformation on Pre-Quenched and Ultrafast-Tempered High-Strength Multiphase Steels

et al. 2019

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High-strength, multiphase steels consisting of pearlite surrounded by tempered martensite were prepared by pre-quenching and ultrafast tempering heat treatment of high-carbon pearlitic steels (0.81% C). The microstructures were analyzed by scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. With an increasing quenching temperature from 120 °C to 190 °C, the quenched martensite variants nucleated via autocatalytic nucleation along the interface. Furthermore, the tempered nodules exhibited a distinct symmetrical structure, and the tempered martensite and pearlitic colonies in the group also showed a symmetrical morphology. In addition, a reasonable model was formulated to explain the transformation process from quenching martensite to the multiphase microstructure. When the quenching temperature was set to 120 °C, followed by ultrafast heating at 200 °C/s to 600 °C and subsequent isothermal treatment for 60 s, the multiphase structure showed highest strength, and the pearlite volume fraction after tempering was the lowest. The microhardness softening mechanism for the tempered structures consisted of two stages. The first stage is related to martensitic sheets undergoing reverse transformation and the nucleation of cementite on dislocations. The second stage involves the transformation of austenite into pearlite and continued carbide coarsening in the martensitic matrix.

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Section: Resultsmentioning

confidence: 84%

Microstructure Transformation on Pre-Quenched and Ultrafast-Tempered High-Strength Multiphase Steels

et al. 2019

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“…In a macroscopic view, the deformation process of pearlite occurs as following: Elastic deformation occurs in both ferrite and cementite phases; Plastic deformation occurs in the ferrite lamellae in advance from the dislocation sources at the ferrite–cementite interfaces [ 119 , 120 , 121 ] and then proceeds into the cementite lamellae [ 122 , 123 ]; The dislocations slip in each lamella interior independently and then the slip transfers appear by the yielding of cementite lamellae. …”

Section: Interactions Between Dislocation and Boundarymentioning

confidence: 99%

“…Plastic deformation occurs in the ferrite lamellae in advance from the dislocation sources at the ferrite–cementite interfaces [ 119 , 120 , 121 ] and then proceeds into the cementite lamellae [ 122 , 123 ];…”

Section: Interactions Between Dislocation and Boundarymentioning

confidence: 99%

Interactions between Dislocations and Boundaries during Deformation

Pan

Zhang

2021

Materials

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The interactions between dislocations (dislocations and deformation twins) and boundaries (grain boundaries, twin boundaries and phase interfaces) during deformation at ambient temperatures are reviewed with focuses on interaction behaviors, boundary resistances and energies during the interactions, transmission mechanisms, grain size effects and other primary influencing factors. The structure of boundaries, interactions between dislocations and boundaries in coarse-grained, ultrafine-grained and nano-grained metals during deformation at ambient temperatures are summarized, and the advantages and drawbacks of different in-situ techniques are briefly discussed based on experimental and simulation results. The latest studies as well as fundamental concepts are presented with the aim that this paper can serve as a reference in the interactions between dislocations and boundaries during deformation.

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“…This is attributed to that when the cooling rate increased, the carbon concentration in austenite increased. At the same time, due to the decrease in temperature, the activity of the atoms was weakened and the diffusion distance was shortened, leading to a decrease in pearlite interlamellar spacing [19][20][21][22].…”

Section: Tem Analysis Of Microstructural Evolutionmentioning

confidence: 99%

Effect of Roller Quenching on Microstructure and Properties of 300 mm Thickness Ultra-Heavy Steel Plate

Han

Wang

et al. 2020

Metals

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In this paper, a 300 mm thickness ultra-heavy steel plate was selected as the research object. In addition, special roller quenching equipment and a new testing method were used to measure the quenching temperature curve at different positions of the steel plate. The relationships and corresponding interaction mechanisms between cooling rate, microstructure, and mechanical properties of an ultra-heavy steel plate during roller quenching were investigated. The results indicated that the cooling rate, strength, hardness, and impact energy decreased gradually along the thickness direction of the plate, while the cooling rate, average grain size, and mechanical properties were relatively uniform with little change along the length direction of the plate. The experimental results provide an effective way to further control the microstructure and properties of ultra-heavy steel plates during roller quenching.

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In situ study of cementite deformation and its fracture mechanism in pearlitic steels

Cited by 30 publications

References 29 publications

Microstructure Transformation on Pre-Quenched and Ultrafast-Tempered High-Strength Multiphase Steels

Microstructure Transformation on Pre-Quenched and Ultrafast-Tempered High-Strength Multiphase Steels

Interactions between Dislocations and Boundaries during Deformation

Effect of Roller Quenching on Microstructure and Properties of 300 mm Thickness Ultra-Heavy Steel Plate

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