Effect of Strain Rate on Hot Ductility Behavior of a High Nitrogen Cr-Mn Austenitic Steel

Wang, Zhenhua; Meng, Qian; Qu, Minggui; Zhou, Zhenyu; Wang, Bo; Fu, Weijie

doi:10.1007/s11661-015-3308-3

Cited by 13 publications

(13 citation statements)

References 28 publications

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“…Cracks propagated along the HAGBs and TBs as the KAM values in these regions were high. Transgranular cracking can be explained by Wang et al [14]. Owing to the many propagation paths for cracking, the reduction in area in this study is much lower than that at 10 −3 ·s −1 [14].…”

Section: Cracking Mechanisms Under Very Low Strain-ratementioning

confidence: 55%

“…In metal deformation, a lower strain rate causes a higher strain gradient from HAGBs to the inside of grains [14]. is means that the deformation is located in a very narrow region near the HAGBs, which is termed "GB sliding" [18,19].…”

Section: Drx Mechanism Under Very Low Strain-ratementioning

confidence: 99%

“…is means that the deformation is located in a very narrow region near the HAGBs, which is termed "GB sliding" [18,19]. Owing to the high temperature and low strain rate, dislocations have sufficient time to form dislocation walls and LAGBs [12,14]. As the deformation developed, subgrains rotated and their misorientation angle increased.…”

Section: Drx Mechanism Under Very Low Strain-ratementioning

confidence: 99%

“…e nucleation mechanisms of DRX are complex and depend on many factors, such as the deformation temperature [23], strain rate [14,16], grain size [24], precipitation [25], and stacking fault energy [16,26]. Further studies are required to clarify the effects of these factors.…”

Section: Drx Mechanism Under Very Low Strain-ratementioning

confidence: 99%

“…Typically, strain rates that , including those for ultra-supercritical rotors [6,7], main pipes in nuclear plants [8,9], and rollers [10,11]. Deformation at very low strain rates features varied and complex recrystallization mechanisms [12,13] and cracking behaviors [14]. e lack of basic data on the microstructure evolution and cracking behavior of superheavy forgings limits their manufacture, development, and applications.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution and Surface Cracking Behavior of Superheavy Forgings during Hot Forging

Wang

Xue

Zhao

2018

Advances in Materials Science and Engineering

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In recent years, superheavy forgings that are manufactured from 600 t grade ingots have been applied in the latest generation of nuclear power plants to provide good safety. However, component production is pushing the limits of the current free-forging industry. Large initial grain sizes and a low strain rate are the main factors that contribute to the deformation of superheavy forgings during forging. In this study, 18Mn18Cr0.6N steel with a coarse grain structure was selected as a model material. Hot compression and hot tension tests were conducted at a strain rate of 10 −4 ·s −1. e essential nucleation mechanism of the dynamic recrystallization involved low-angle grain boundary formation and subgrain rotation, which was independent of the original highangle grain boundary bulging and the presence of twins. Twins were formed during the growth of dynamic recrystallization grains. e grain refinement was not obvious at 1150°C. A lowering of the deformation temperature to 1050°C resulted in a fine grain structure; however, the stress increased significantly. Crack-propagation paths included high-angle grain boundaries, twin boundaries, and the insides of grains, in that order. For superheavy forging, the ingot should have a larger height and a smaller diameter.

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Section: Cracking Mechanisms Under Very Low Strain-ratementioning

confidence: 55%

Section: Drx Mechanism Under Very Low Strain-ratementioning

confidence: 99%

Section: Drx Mechanism Under Very Low Strain-ratementioning

confidence: 99%

Section: Drx Mechanism Under Very Low Strain-ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Microstructure Evolution and Surface Cracking Behavior of Superheavy Forgings during Hot Forging

Wang

Xue

Zhao

2018

Advances in Materials Science and Engineering

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Strain Rate Dependence of Hot Tensile Behavior, Microstructure Evolution, and Fracture Mechanism of Lean Duplex Stainless Steel 2101

Deng

et al. 2021

steel research int.

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Lean duplex stainless steel 2101 (LDX 2101) shows a good comprehensive performance of local corrosion resistance, stress corrosion cracking resistance, and high strength. [1][2][3][4] Compared with conventional duplex stainless steels (DSSs), LDX 2101, which uses cheap Mn and N to replace expensive Ni, is considered a potential candidate for cost efficiency and is widely used as a material in the nuclear, chemical, and food industries. [5] However, compared with other single-phase stainless steels, the hot deformation behavior of LDX 2101 is more complex, which makes it difficult to hot work and significantly hinders its large-scale industrial application. The edge cracking is a long-term problem during the hot deformation process of DSSs, especially for LDX 2101. [3,[6][7][8][9][10] The edge cracking of LDX 2101 under hot deformation conditions has not been completely solved. To avoid hot cracking of steel, several process parameters, such as deformation temperature and strain rate, must be considered. [11,12] Improper process parameters will affect the surface quality of the final product. It is generally believed that strain rate is an important factor affecting the thermal deformation behavior of DSSs. The effect of strain rate on the hot deformation behavior of these DSSs has been investigated by many research groups. Most of these studies have focused on the hot compression process of DSSs, when the material is subjected to compressive stress. Patra et al. observed the microstructure evolution of LDX 2101 during hot compression at 800À1000 C and studied its effect on hot working properties. [1] Kingklang et al. conducted hot compression tests on 2507 DSS at different temperatures and strain rates and proposed a flow stress model that could be used to design and optimize the DSS manufacturing process at high temperatures. [13] Fang et al. observed that cracks formed at the α/γ interface during the hot compression test of LDX 2101 and gradually propagated into the ferrite matrix. [3] Ha et al. studied the high-temperature deformation of (C þ N)-added S32101 DSS by hot compression. The results show that the hot deformation cracking originates from the precipitated phase at the ferriteÀaustenite interphase boundary. [14] Cizek et al. studied the microstructure evolution and softening mechanism of austenite and ferrite in 21CrÀ10NiÀ3Mo DSS by hot compression. A large part of the dynamic softening of austenite is attributed to discontinuous dynamic recrystallization (DDRX), and the softening mechanism within the ferrite is classified as continuous dynamic recrystallization (CDRX). [15] Mozumder et al. studies the compressive deformation behavior of FeÀMnÀAlÀNiÀC lightweight steel within a temperature regime of 1223À1423 K and at a strain rate of 10 s À1 . The results show that the face-centered cubic (FCC) phase recrystallizes by DDRX and the body-centered cubic (BCC) phase exhibits a DDRX-like mechanism near the FCC/BCC interphase boundaries. [16] Haghdadi et al. investigated the relationship between the ferrite...

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δ-Ferrite Formation and Its Effect on the Mechanical Properties of Heavy-Section AISI 316 Stainless Steel Casting

Wang

Chen

Rong

2020

Metall Mater Trans A

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Effect of Strain Rate on Hot Ductility Behavior of a High Nitrogen Cr-Mn Austenitic Steel

Cited by 13 publications

References 28 publications

Microstructure Evolution and Surface Cracking Behavior of Superheavy Forgings during Hot Forging

Microstructure Evolution and Surface Cracking Behavior of Superheavy Forgings during Hot Forging

Strain Rate Dependence of Hot Tensile Behavior, Microstructure Evolution, and Fracture Mechanism of Lean Duplex Stainless Steel 2101

δ-Ferrite Formation and Its Effect on the Mechanical Properties of Heavy-Section AISI 316 Stainless Steel Casting

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