Effect of Secondary Phase Precipitation on Impact Toughness of Duplex Stainless Steel

Powar, Amit; Gujar, Amol; Manthani, Niketan; Pawar, Vinayak; Singh, Rajkumar

doi:10.4028/www.scientific.net/msf.889.138

Cited by 4 publications

(4 citation statements)

References 12 publications

(9 reference statements)

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“…The mechanism of nucleation and growth occurs when the chromium content in the ferrite phase is inferior to 23% (mass) and the thermal treatment of aging is performed above 500°C. For this mechanism, the diffusion occurs with a greater reduction in the Gibbs free energy and phase α' is more roughly formed than in the spinodal decomposition, because of the formation of coherent interfaces (Cavalcanti, Muterlle & Reinke, 2019, Haupt, Silva, Falcade, Santos & Reguly, 2019, Kisasoz, Gurel & Karaaslan, 2016, Mehta, Jadhav, Shaikh, Kumar & Kirwai, 2019, Nithin, Sekar & Joseph, 2019, Ogawa & Osuki, 2020, Powar, Gujar, Manthani, Pawar & Singh, 2017, Valeriano, Correa, Mariano, Robin & Machado, 2019.…”

Section: Introductionmentioning

confidence: 99%

Temperature and time effect of thermal aging treatment on microstructure and corrosion resistance of UNS S31803 duplex stainless steel

Dainezi

Borges

Sousa

et al. 2021

RSD

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Duplex stainless steels correspond to a class of steel in which the microstructure is composed basically by the phases ferrite and austenite. Given the metastable character of ferrite, associated phase transformations can occur during thermal treatments, which can lead to a reduction in corrosion resistance. Therefore, the aim of this work was to evaluate the influence of the solution-treated at 1100°C for 30min and aging at 500 and 600°C for 1, 3 and 12h, on the microstructure and corrosion resistance of DSS UNS S31803. The steels were characterized by SEM, EDS, XRD, hardness, microhardness and thermal analysis. The steels aged at 500°C for 1h presented the phase alpha line dispersed in the ferrite, and the steels aged at 600°C for 12h presented the phases alpha line, sigma and chi. In the assays of double cycle potentiodynamic reactivation in solution of 0.5M H2SO4 and 0.01M KSNC, it was observed that no sensitization occurred. Furthermore, in the tests of cyclic potentiodynamic polarization, in 3.5% NaCl solution, it was verified that the precipitation of the alpha line phase did not alter corrosion resistance; nevertheless, the sigma phase reduced corrosion resistance.

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Section: Introductionmentioning

confidence: 99%

Temperature and time effect of thermal aging treatment on microstructure and corrosion resistance of UNS S31803 duplex stainless steel

Dainezi

Borges

Sousa

et al. 2021

RSD

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“…Impact toughness, as one of the most important properties of materials, depends on the microstructure of the material and directly reflects the resistance of the material to crack propagation [10][11][12][13]. It is generally believed that in the process of brittle fracture, the nucleation and propagation of cleavage cracks have an influence on the impact absorption energy.…”

Section: Introductionmentioning

confidence: 99%

Effects of Microstructure on the Low-Temperature Toughness of an X80 × D1422 mm Heavy-Wall Heat-Induced Seamless Bend

Liu

Wang

et al. 2021

Metals

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The relationship between the microstructure and the low-temperature toughness of an X80 × D1422 mm heavy-wall heat-induced seamless bend was investigated, including the influence of microstructure on crack initiation and crack propagation. Using optical microscopy, scanning electron microscopy, transmission electron microscopy, and electron backscattered diffraction, the microstructure and crystallographic orientation characteristics were studied. An instrumented impact tester was used to investigate the impact toughness. The results showed that during the hot bending process, there was a difference in the induction heating temperature and the cooling rate results in the uneven microstructure of the inner surface, center position, and outer surface of the bend. The center position was mainly composed of granular bainite and exhibited the best combination of strength and toughness. The ductile–brittle transition temperatures of the inner surface, center position, and outer surface were −88, −85, and −60 °C, respectively. In the process of impact deformation, the non-uniformly distributed strain concentration regions are likely to cause uneven distribution of plastic deformation and the nucleation of microcracks. The high ratio of high-angle grain boundaries and the smaller effective grain size of the inner surface and center position lead to higher crack growth absorption energy. The low crack propagation energy of the outer surface is attributed to the fact that the high-angle grain boundary does not effectively deviate or arrest the crack propagation, and multiple microcracks are connected to one another and cause fracture failure.

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“…The other reason that affects the hot workability of duplex stainless steel is the precipitation of σ phase. The σ phase is hard and brittle, and it is the most harmful precipitation phase in steel, which can significantly reduce the plasticity of steel [6][7][8][9]. Amit [7] and Wang [10] et al believed that it is the slow cooling rate during forging that transforms δ phase to σ phase, and the precipitation of σ phase in this process damages the hot workability.…”

Section: Introductionmentioning

confidence: 99%

“…The σ phase is hard and brittle, and it is the most harmful precipitation phase in steel, which can significantly reduce the plasticity of steel [6][7][8][9]. Amit [7] and Wang [10] et al believed that it is the slow cooling rate during forging that transforms δ phase to σ phase, and the precipitation of σ phase in this process damages the hot workability. It was observed that the high content of α-phase stabilising elements in SAF3207, such as Cr, Mo, and Ni, can promote the precipitation of σ phase, making the hot workability problems more typical [4,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of solution treatment on microstructure and properties of 00Cr32Ni7Mo3.5N

Chen

Ren

et al. 2021

Powder Metallurgy

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00Cr32Ni7Mo3.5N parts were prepared by hot isostatic pressing (HIP) and forging process in this study. The effect of solution heat treatment on microstructure, mechanical properties and pitting resistance were investigated. Under solution treating at 1100°C, the phase constitution in HIP parts can be adjusted to comprise approximately 50% austenite (γ) and 50% ferrite (δ) phases with equiaxed structure, and this post-processing can meanwhile help to dissolve precipitated brittle σ phase. In comparison, the banded dual-phase structures in forged counterparts cannot be removed even after annealing at 1200°C. The desired phase proportion after solution treatment plus the equiaxed grains impart superior comprehensive performance to HIP parts with the tensile strength of 886 MPa, elongation of 48.0%, impact energy of 83 J, and pitting potential of 0.9659 V in neutral 3.5 wt-% NaCl solution. Based on this work, HIP seems to be a promising method to fabricate near-net-shape 00Cr32Ni7Mo3.5N parts.

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Effect of Secondary Phase Precipitation on Impact Toughness of Duplex Stainless Steel

Cited by 4 publications

References 12 publications

Temperature and time effect of thermal aging treatment on microstructure and corrosion resistance of UNS S31803 duplex stainless steel

Temperature and time effect of thermal aging treatment on microstructure and corrosion resistance of UNS S31803 duplex stainless steel

Effects of Microstructure on the Low-Temperature Toughness of an X80 × D1422 mm Heavy-Wall Heat-Induced Seamless Bend

Effect of solution treatment on microstructure and properties of 00Cr32Ni7Mo3.5N

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