Hot-workability of super-304H exhibiting continuous to discontinuous dynamic recrystallization transition

Babu, K. Arun; Mozumder, Yahya H.; Saha, Rajib; Sarma, V. Subramanya; Mandal, Sumantra

doi:10.1016/j.msea.2018.07.104

Cited by 51 publications

(9 citation statements)

References 62 publications

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“…Regarding ASSs, due to the absence of a notable phase transformation during the thermal treatment, grain refinement has been achieved by static recrystallization (SRX), dynamic recrystallization (DRX), formation and reversion of strain‐induced martensite, and various severe plastic deformation techniques . In fact, many commercial ASSs are metastable against the martensitic transformation during deformation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Naghizadeh

Mirzadeh

2019

steel research int.

126

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Grain size effects on the properties of AISI 304 austenitic stainless steel are studied. Yield stress (YS) and ultimate tensile strength (UTS) increased with decreasing grain size (Hall–Petch law) while the difference between YS and UTS decreased. Three distinct stages for work‐hardening rate are identified: I) initial rapid fall until reaching a minimum value, II) subsequent rise to a maximum due to the transformation‐induced plasticity (TRIP) effect, which is found to enhance by increasing grain size, and III) final fall until the onset of necking. More in‐depth analysis on the mechanical stability of austenite reveals that for below‐average grain size of ≈50 μm, by decreasing grain size, the TRIP effect diminishes; whereas for grain size larger than ≈50 μm, by increasing grain size, the TRIP effect becomes less pronounced. Due to the strong TRIP effect, high incremental work‐hardening exponents (n‐values of higher than 0.8) and low‐yield ratios (smaller than 0.5) are observed. It is also found that when the average grain size increases, the tensile toughness and the size and depth of dimples increase. The latter is responsible for the tardiness of the microcavity coalescence, which is indicative of high ductility of this austenitic alloy.

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Section: Introductionmentioning

confidence: 99%

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Naghizadeh

Mirzadeh

2019

steel research int.

126

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“…In the third position, the DRX grains were distributed in the interior of deformed grains, as shown in Region 4 of Figure 3(f). This is a characteristic of the CDRX mechanism [18,20,21], which mainly depends on the rotation of sub-grains. In the CDRX process, the grains are formed by the gradual transformation of sub-boundaries (LAGBs and MAGBs) into HAGBs [18,20,21].…”

Section: Resultsmentioning

confidence: 99%

“…This is a characteristic of the CDRX mechanism [18,20,21], which mainly depends on the rotation of sub-grains. In the CDRX process, the grains are formed by the gradual transformation of sub-boundaries (LAGBs and MAGBs) into HAGBs [18,20,21]. However, the DRX grains of the sample at 1000 °C were mainly distributed in HAGBs (Figure 3(b, f)), indicating that the expansion-nucleation and growth of DRX grains on HAGBs is the main DRX mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…At 900 °C, the dislocation and interface migration rate was low, which was not conducive to the formation of DRX grains in SASS. Therefore, the DRX behaviour was mainly the formation of HAGBs due to the rotation of sub-interfaces (LAGBs and MAGBs) and the formation of sub-grains due to the intersection of interfaces (LAGBs, MAGBs and HAGBs), which were characteristics of CDRX mechanism [18,20,21]. When the temperature increased to 1000 °C, DRX occurred but the deformation temperature was still low.…”

Section: Resultsmentioning

confidence: 99%

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Effect of hot deformation parameters on dynamic recrystallisation mechanisms of super austenitic stainless steel

Wang

Chen

Wang

et al. 2022

Materials Science and Technology

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Hot compression tests on super austenitic stainless steel (SASS) are performed in the temperature range of 900–1200 °C and strain rates of 0.01–10 s−1. The results reveal that, at lower deformation temperatures of 900 and 1000 °C or lower strain rates of 0.01 s−1, 0.1 s−1 and 1 s−1, the dominant DRX mechanism of SASS can be summarised as: a large number of high-angle grain boundaries (HAGBs) are gradually developed from low-angle grain boundaries (LAGBs) and DRX grains are partially formed on HAGBs. However, the formation of DRX grains due to sub-grain rotation is the main DRX mechanism at higher temperatures of 1100 °C and 1200 °C and at the higher strain rate of 10 s−1.

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“…Some reports have been conducted on the mechanisms of DRX, where two mechanisms are generally accepted: discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX). [10][11][12][13][14][15] Previous research [16][17][18][19][20][21][22] demonstrated that DDRX via grain boundary (GB) bulging dominates the DRX process during the deformation of several nickel-based superalloys, such as Allvac 718Plus, Udimet 720Li, FGH4096, Inconel 718, and so on. DDRX strongly depends on preexisting GBs, which are potential nucleation sites of DDRX.…”

Section: Introductionmentioning

confidence: 99%

A Mechanism for the Evolution of Hot Compression Cracking in Inconel 625 Alloy Ingot With Respect to Grain Growth

Jia

Gao

Ji³

2020

Adv Eng Mater

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Hot compression cracking of as‐cast Inconel 625 alloy is investigated utilizing high temperature and high strain rate compression tests. The formation mechanism of the hot crack is systematically investigated based on grain growth and crystal slipping. Scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) analysis are used to characterize the crack morphology and microstructure. SEM results showed that the hot cracking during hot compression of Inconel 625 alloy is determined to be quasi‐cleavage fracture. The formation of carbide (NbC) plays a key role in the formation and propagation of the hot crack. The various slip systems activation strongly contributes to the overall growth of the dynamic recrystallization (DRX) grains. In addition, subgranular boundary formation within the grown grains is attribution to various slip systems activation in different local regions. The initiation and propagation of the hot compression cracks in Inconel 625 alloy depend on the development of the subgranular boundary within the grown grain.

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Hot-workability of super-304H exhibiting continuous to discontinuous dynamic recrystallization transition

Cited by 51 publications

References 62 publications

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Effect of hot deformation parameters on dynamic recrystallisation mechanisms of super austenitic stainless steel

A Mechanism for the Evolution of Hot Compression Cracking in Inconel 625 Alloy Ingot With Respect to Grain Growth

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