Effect of grain size on Hall-Petch relationship during rolling process of reinforcement bar

Bhansali, Kunal; Keche, Ashok J.; Gogte, C. L.; Chopra, Swamini

doi:10.1016/j.matpr.2020.02.655

Cited by 15 publications

(2 citation statements)

References 12 publications

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“…As compared to the as-welded counterpart, the HAZ softening was much improved. The refined martensite matrix shown in Figure 4 b contributed to the improvement in hardness in terms of Hall–Petch relation [ 17 , 18 , 19 ]. Meanwhile, Figure 9 a shows the occurrence of softening at locations of 0.5–1.5 mm away from fusion line (marked in red), which coincided with the toughness of the distance dependency shown in Figure 8 b,c.…”

Section: Resultsmentioning

confidence: 99%

Eliminating the Brittleness Constituent to Enhance Toughness of the High-Strength Steel Weld Heat-Affected Zone Using Electropulsing

Chen

Xiong

et al. 2022

Materials

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The evolution of the martensite–austenite (MA) constituent in the heat-affected zone (HAZ) of high-strength steel FH690 welds when subjected to electropulsing (EP) treatment was investigated herein, with the aim of eliminating brittle MA to enhance toughness. The features induced by EPT were correlated with the microstructure and fractography through scanning electron microscopy and electron backscatter diffraction analyses, together constituting an impact property evaluation. The Charpy V-notch impact results showed EPT could improve toughness of the HAZ from 34.1 J to 51.8 J (the calibrated value was 46 J). Examinations of EP-treated microstructure showed a preferred Joule heating: at the site of the MA constituent, the cleavage fractography introduced by the MA constituent was substituted with ductile dimples with various sizes. Decreases in grain size of 40% and 47% for the matrix and the retained austenite, respectively, were achieved; while for regions without the MA constituent, microstructural modification was negligible. The temperature rise at sample surface was less than 60 °C. The mechanism behind this favorable Joule heating for the MA constituent was correlated with the electrical properties of the MA constituent in contrast with martensite matrix. The toughness enhancement of the HAZ was thus attributed to the elimination of the coarse MA constituent. The present investigation suggested that electropulsing, characterized as a narrow-duration current, is a promising method for preferred elimination of brittle factors and thus improving the toughness of HAZ of high-strength steel within a limited region with a width less than 2 mm.

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Section: Resultsmentioning

confidence: 99%

Eliminating the Brittleness Constituent to Enhance Toughness of the High-Strength Steel Weld Heat-Affected Zone Using Electropulsing

Chen

Xiong

et al. 2022

Materials

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“…Macroscopically, this was manifested as a higher compressive strength; however, when the sintering temperature reached 2100°C, obvious grain growth occurred, which seriously reduced the material's properties. According to the Hall-Petch equation (σ s = σ 0 + kd 1/2 ), where σ 0 and K are constants related to the material; d is the average grain size; σ s is the yield strength, which is easily influenced by the grain size [40][41][42][43]. The grain growth increased the stress concentration tendency, and cracks were easily formed and propagated.…”

Section: Mechanical Properties Of W-10 Wt-%ta Alloys With Different S...mentioning

confidence: 99%

Microstructure and mechanical properties of W-10 wt-%Ta alloys prepared by spark plasma sintering

Liu

Huang

Wang

et al. 2022

Materials Science and Technology

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The brittleness of tungsten (W) is a key factor that affects the preparation and application of high-performance tungsten alloys. Tantalum (Ta), which can form a complete solid solution with tungsten, was expected to improve its dislocation mobility and toughness. In the W-10 wt-%Ta alloys prepared by spark plasma sintering, the amount of Ta solid dissolved in tungsten increased gradually upon increasing the sintering temperature. The compressive strength of W-10 wt-%Ta alloys first increased and then decreased by increasing the sintering temperature. The solid solution of tantalum constructed a large number of defects and edge dislocations in the tungsten structure. This result is surprising because plastic flows are generally controlled by screw dislocations in Body-Centered Cubic (BCC) metals and dilute alloys.

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Microstructure and Mechanical Properties of Copper–steel Laminated and Sandwich Joints Prepared by Electron Beam Welding

Song

Wang

Jiang

et al. 2020

J. of Materi Eng and Perform

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Effect of grain size on Hall-Petch relationship during rolling process of reinforcement bar

Cited by 15 publications

References 12 publications

Eliminating the Brittleness Constituent to Enhance Toughness of the High-Strength Steel Weld Heat-Affected Zone Using Electropulsing

Eliminating the Brittleness Constituent to Enhance Toughness of the High-Strength Steel Weld Heat-Affected Zone Using Electropulsing

Microstructure and mechanical properties of W-10 wt-%Ta alloys prepared by spark plasma sintering

Microstructure and Mechanical Properties of Copper–steel Laminated and Sandwich Joints Prepared by Electron Beam Welding

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