Grain Size Effect on the Hot Ductility of High-Nitrogen Austenitic Stainless Steel in the Presence of Precipitates

Wang, Zhenhua; Wang, Yong; Wang, Chengming

doi:10.3390/ma11061026

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…On the other hand, the carbide precipitates could also provoke a loss of the hot ductility of steels by themselves, as reported by many published works [21][22][23][24][25][26]. The precipitates at grain boundaries reduce the binding force of grain boundaries, retard the onset of dynamic recrystallization and cause stress concentration, thus promoting intergranular failure and reducing hot ductility.…”

Section: Effect Of V Content On Hot Ductilitymentioning

confidence: 99%

Effect of Vanadium and Strain Rate on Hot Ductility of Low-Carbon Microalloyed Steels

Song

Tian

Xiao³

et al. 2021

Metals

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Hot tensile tests were conducted in this study to investigate the effect of strain rate (10−3 and 10 s−1) and vanadium content (0.029 and 0.047 wt.%) on the hot ductility of low-carbon microalloyed steels. The results indicate that a hot ductility trough appears at a low strain rate (10−3 s−1) because of the sufficient time for ferrite transformation and the growth of second particles, but it disappears at a high strain rate (10 s−1). The hot ductility is improved with the increase in strain rate at 700 °C or higher temperatures. In addition, with the increase in vanadium content, the large amounts of precipitate and increased ferrite transformation result in poor hot ductility of steels fractured at a low temperature range (600~900 °C). However, when the steel is fractured at a high temperature range (1000~1200 °C), more vanadium in the solid solution in the austenite inhibits the growth of parental austenite grains and results in grain refinement strengthening, slightly improving the hot ductility.

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Section: Effect Of V Content On Hot Ductilitymentioning

confidence: 99%

Effect of Vanadium and Strain Rate on Hot Ductility of Low-Carbon Microalloyed Steels

Song

Tian

Xiao³

et al. 2021

Metals

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“…We carried out a series of XPS experiments to characterize the chemical composition of the passive films which may have great impacts on the corrosion behavior and semiconducting properties 20 + could consume protons and prevent local acidification, thus improve the corrosion resistance. However, the existence of Cr 2 N can induce Cr-depleted regions in the matrix, which is detrimental to corrosion resistance 21,22 . The relative fraction (C x ) of each species in a passive film can be calculated and are shown in Fig.…”

Section: Passive Film Analysismentioning

confidence: 99%

3D printed N-doped CoCrFeNi high entropy alloy with more than doubled corrosion resistance in dilute sulphuric acid

Zhou

Chen

et al. 2023

npj Mater Degrad

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The traditional approaches for improving corrosion resistance of alloys typically lead to the sacrifice of mechanical properties because the microstructures needed for improving corrosion resistance often contradict those for high strength. Here we demonstrate that selected laser melting (SLM), a net-shape additive manufacture technique, can maintain good mechanical properties while double the corrosion-resistance of a N-doped CoCrFeNi HEA. The SLM processed sample possesses a heterogeneous microstructure with 3D dislocation cells inside each grain. The SLM-induced 3D dislocation cell structure can provide effective diffusion paths to significantly promote Cr outward segregation, forming a thick protective Cr oxide layer, which renders excellent corrosion resistance. Furthermore, Cr segregation along cell boundaries provides numerous sites for nucleation of oxides, and stabilizes the cell structure for good mechanical properties. The strategy discovered here may also be applied to other HEAs with multiple strengthening mechanisms.

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“…The high nitrogen steel has high deformation resistance during hot forging because of its large number of alloy elements and high N content, which results in a narrow hot processing working window [8][9][10]. In the actual forging process, forging cracks, coarse grains, mixed grains and other problems are easy to occur [9,11,12], and even the forgings will be scrapped in serious cases. This not only reduces the production efficiency and increases the production cost, but also poses a great threat to the service safety of equipment.…”

Section: Introductionmentioning

confidence: 99%

Study on thermal deformation behavior and microstructure evolution of P550 high nitrogen austenitic stainless steel

Guo

2023

Mater. Res. Express

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The high nitrogen austenitic stainless steel is widely used as power generation and geological exploration equipment materials because of its excellent strength, corrosion resistance and non-magnetic. In this paper, the mechanical behavior and microstructure evolution of P550 steel in the range of 900-1200 ℃ and 0.001-10 s-1 deformation conditions were studied by physical and heat treatment simulations, metallographic observations and thermal processing maps. The results showed that the flow curves quickly reach the peak and then soften to a steady state, which indicates dynamic recrystallization (DRX) behavior. DRX is easy to occur when the deformation temperature is above 1080 ℃. The activation energy of the forged P550 stainless steel was calculated as 519 kJ/mol. There is a positive correlation between the peak stress, DRX critical stress, strain and Z value of the tested steel. The instability of the tested steel is easy to produce in the high strain rate region and low temperature region during hot working. Crack germinates and expands preferentially at the "necklace structure" of inadequate dynamic recrystallization. Under the deformation state of 0.001 s-1, coarse crystals and mixed crystals are easily emerged during subsequent heat treatment. Combining the hot working map, the maximum deformation resistance and the grain evolution behavior during hot working and heat treatment, the suggested working window is T=1020-1200 ℃ and έ=0.01-1 s-1.

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Grain Size Effect on the Hot Ductility of High-Nitrogen Austenitic Stainless Steel in the Presence of Precipitates

Cited by 7 publications

References 21 publications

Effect of Vanadium and Strain Rate on Hot Ductility of Low-Carbon Microalloyed Steels

Effect of Vanadium and Strain Rate on Hot Ductility of Low-Carbon Microalloyed Steels

3D printed N-doped CoCrFeNi high entropy alloy with more than doubled corrosion resistance in dilute sulphuric acid

Study on thermal deformation behavior and microstructure evolution of P550 high nitrogen austenitic stainless steel

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