Hot Deformation Behavior of Fe-2%Si

Han, Kyu Seok; Song, Tae Jin; Cooman, Bruno C. De

doi:10.2355/isijinternational.53.294

Cited by 16 publications

(2 citation statements)

References 37 publications

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“…It can significantly suppress the movement ability of screw dislocations and inhibit the DRV of ferrite, thus inhibiting the occurrence of the CDRX mechanism. [43,44] Some recent studies have reported that high level of DRV within ferrite at low strain rates during hot deformation promoted the occurrence of CDRX, while an increase in strain rate can significantly inhibit the DRV process of ferrite, thus promoting the occurrence of DDRX, [19,29,31] which are consistent with the observations of this study.…”

Section: Dynamic Softening Mechanism Of Ferritesupporting

confidence: 92%

The Microstructure Evolution and Dynamic Softening Mechanism of a 00Cr27Ni7Mo5N Hyper Duplex Stainless Steel

Wang

et al. 2023

steel research int.

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Duplex stainless steels combine the advantages of ferritic and austenitic properties with excellent strength, plastic toughness, and corrosion resistance, [1][2][3][4][5] resulting in a wide range of applications in the marine industry, chemical industries, and heat exchangers. To meet the needs of deep-sea oil and gas exploration, desalination, and other harsh corrosion conditions of high chloride, pitting resistance equivalent value greater than 48, such as 00Cr27Ni7Mo5N hyper duplex stainless steel has received more and more attention. It is well known that the differences between ferrite and austenite in duplex stainless steels, such as the stacking fault energy (SFE), crystal structure, and grain boundary migration ability, affect the dislocation motion, resulting in a complex softening mechanism of both phases during hot deformation. [6][7][8][9][10][11][12][13][14][15][16] Liu et al. [17] reported that continuous dynamic recrystallization (CDRX) tended to occur in both phases of LDX2101 duplex stainless steel during hot deformation. Deng et al. [18] indicated that both phases of 23Cr-2.2Ni-6.3Mn-0.26N duplex stainless steel would tend to soften via dynamic recovery (DRV) under low temperature and high strain rate conditions, while its softening was dominated through the DRX of austenite under high temperature and low strain rate. Chen et al. [19] investigated the dynamic softening mechanism of 2205 duplex stainless steel. The results showed that the softening mechanism of ferrite changed from a (sub)crystalline agglomeration mechanism at low strain rates to the CDRX mechanism at medium strain rates, and then the discontinuous dynamic recrystallization (DDRX) mechanism occurred at high strain rates. Meanwhile, austenite softened through the CDRX mechanism at low strain rates, while twins formed at high strain rates softened via the DDRX mechanism.Owing to its relatively high SFE, ferrite is prone to undergo DRV during hot deformation. As the strain increases, dislocations and (sub)grains are absorbed, and the transition from low-angle boundaries (LABs) to high-angle boundaries (HABs) occurs, which is called "extended" DRV. It can also be referred to as CDRX. [19][20][21][22][23][24] However, some recent studies [11,[25][26][27][28][29] reported ferrite can soften through the DDRX mechanism under certain deformation conditions, among which, Haghdadi et al. [28,29] proposed that the softening mechanism of ferrite shifted from the CDRX to DDRX mechanism as the strain rate increased during hot deformation. The softening of ferrite was predominated through the CDRX mechanism, conversely, tended to the DDRX mechanism, when the Z parameter values [30] were above some critical limit (i.e., at high temperature and low strain rate). However, Castan et al. [31] reported that the softening of ferrite in Fe-8% Al low-density steels preferentially through the DDRX

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Section: Dynamic Softening Mechanism Of Ferritesupporting

confidence: 92%

The Microstructure Evolution and Dynamic Softening Mechanism of a 00Cr27Ni7Mo5N Hyper Duplex Stainless Steel

Wang

et al. 2023

steel research int.

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“…Climbing of dislocations with opposite signs [3], recrystallization 4) and phase transition 5) . Recrystallization is caused by relocation of lattice in locally and phase transition causes relocation of lattice in entirely.…”

Section: Discussionmentioning

confidence: 99%

Development of Precise Load Prediction System for Free Forging of Ni-based Superalloy having Softening

Sakurai

Okajima

Fujiwara

et al. 2014

Procedia Engineering

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Ni-based superalloys such as Alloy 706 that have high heat resistance are applied to gas turbine disks in electric power plant because. Free forging is one of the effective forging processes to form superalloy products, and forging simulation is quite useful method to optimize forging schedule. Softening behaviour at high temperature was not considered and implemented in conventional simulation, that induced the accuracy of load prediction. In this study, we investigated softening behaviour to improve the accuracy of forging simulation.

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Dynamic Restoration Processes in a 23Cr-6Ni-3Mo Duplex Stainless Steel: Effect of Austenite Morphology and Interface Characteristics

Haghdadi

Čížek

Beladi

et al. 2017

Metall Mater Trans A

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Hot Deformation Behavior of Fe-2%Si

Cited by 16 publications

References 37 publications

The Microstructure Evolution and Dynamic Softening Mechanism of a 00Cr27Ni7Mo5N Hyper Duplex Stainless Steel

The Microstructure Evolution and Dynamic Softening Mechanism of a 00Cr27Ni7Mo5N Hyper Duplex Stainless Steel

Development of Precise Load Prediction System for Free Forging of Ni-based Superalloy having Softening

Dynamic Restoration Processes in a 23Cr-6Ni-3Mo Duplex Stainless Steel: Effect of Austenite Morphology and Interface Characteristics

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