Microstructural Evolution during Homogenization and Hot Deformation for As‐Cast H13 Steel

Han, Yahui; Li, Changsheng; Ren, Jia; Qiu, Chunlin; Li, En; Chen, Shuaishuai

doi:10.1002/srin.202000439

Cited by 8 publications

(3 citation statements)

References 23 publications

(24 reference statements)

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“…At 420 °C, which was close to the Bs temperature, the bainitic driving force further decreased. In the early stages of the transformation, it was accepted that the grain boundary is a fast channel for element diffusion; [ 31 ] therefore, only a small fraction of acicular bainite was formed at the prior austenite grain boundaries (PAGBs). Because the carbon in bainite had no time to diffuse, it precipitated in the form of carbides.…”

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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“…Guo et al [ 34 ] found that a higher strain rate promotes DRX kinetics at elevated temperatures. Han et al [ 35 ] suggested that it is easier to obtain small equiaxed grains at high strain rates than at low strain rates. Hodgson et al [ 36 ] proposed a model that describes the effects of strain, strain rate, and temperature on the recrystallization fraction, as follows

$$\left{\right.

…”

Section: Discussionmentioning

confidence: 99%

Effects of Deformation Penetration and Recrystallization on the Internal Quality of Casting Ingot

Cheng,

Liu,

Liu

et al. 2024

steel research int.

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To investigate the influence of rolling passes on the internal quality during high‐temperature reduction pretreatment (HTRP), three cast ingots with identical total reduction but varying numbers of rolling passes are prepared. The 3D distribution, size, and quantity of defects are analyzed using ultrasonic nondestructive microscopy. The effect of rolling passes on defect healing is studied, with macrostructure, microstructure, and grain size analysis aided by finite element software. In contrast to the three‐pass HTRP, the one‐pass HTRP demonstrates a diminishment of 7% in defect dimensions and a notable decline of 66% in the quantity of defects. The results reveal that increasing the number of rolling passes leads to a deterioration in internal quality of the slab. Reducing the number of rolling passes improves internal strain penetration, facilitates the recrystallization process, and enhances the microstructure uniformity, ultimately improving the internal quality.

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“…When the homogenisation temperature was higher than Ac 3 , the crystal structure of experimental steel was γ -Fe. A temperature of 1200°C was selected as the homogenisation temperature of the γ -Fe phase region [16]. Homogenisation processes were carried out in a chamber electric furnace.…”

Section: Methodsmentioning

confidence: 99%

Dendrite structure and microhardness of as-cast 4Cr5MoSiV1 steel between different homogenisation processes

Han

et al. 2021

Materials Science and Technology

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The dendrite structure and hardness of 4Cr5MoSiV1 ingot at different homogenisation processes were studied in order to identify the most efficient and cost-effective heat treatment for this steel. The microsegregation and microhardness were analysed after different soak-times at 800 or 1200°C for single-stage treatments, and for two-stage treatments of different soaking times at both these temperatures. At the single-stage homogenisation treatment, it would be expected that with the increasing of soaking times, the homogenisation effect becoming better, and the higher temperature soak especially so. However, the two-stage homogenisation treatments could be more effective than single-stage treatment at the higher temperature. The two-stage treatments 800°C/3 h + 1200°C/1 h have better homogenisation effect than 1200°C/4 h.

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Microstructural Evolution during Homogenization and Hot Deformation for As‐Cast H13 Steel

Cited by 8 publications

References 23 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

Effects of Deformation Penetration and Recrystallization on the Internal Quality of Casting Ingot

Dendrite structure and microhardness of as-cast 4Cr5MoSiV1 steel between different homogenisation processes

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