Influence of Two Different Salt Mixture Combinations of Na2SO4-NaCl-NaVO3 on Hot Corrosion Behavior of Ni-Base Superalloy Nimonic263 at 800 °C

Mannava, Venkateswararao; Sambasivarao, A.; Kamaraj, M.; Kottada, Ravi Sankar

doi:10.1007/s11665-019-3866-4

Cited by 20 publications

(10 citation statements)

References 41 publications

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“…All the test specimens were cleaned by acetone before hot corrosion testing. The salt mixture (corrosive medium) consisted of 87.5 wt.% Na 2 SO 4 + 5 wt.% NaCl + 7.5 wt.% NaVO 3 , which simulated the marine-like environment [34]. The tensile test specimens were placed in rectangular alumina crucibles and immersed completely in the corrosive salt mixture at 650 • C in a muffle furnace (Shanghai Daheng Optics and Fine Mechanics Co., Ltd., Shanghai, China).…”

Section: Hot Corrosion Testingmentioning

confidence: 99%

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Zhang

Zhuang

et al. 2020

Materials

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Hot corrosion is one of the crucial failure modes of Ni-based superalloy components operating at high temperatures, which inevitably affects the subsequent mechanical properties of the alloys. In this research, damaged Inconel 718 alloy components with a pre-made trapezoid groove are repaired using laser additive manufacturing technique, and the change mechanisms of the microstructure and tensile properties of the repaired Inconel 718 alloy due to the hot corrosion in the salt mixture of 87.5 wt.% Na2SO4 + 5 wt.% NaCl + 7.5 wt.% NaNO3 at 650 °C for different durations are investigated. The results show that oxidation and Cr-depletion occur on the repaired components due to the hot corrosion, and the corrosion products are mainly composed of Cr2O3, Fe3O4, and Ni3S2. The tensile strength and elongation of the as-repaired specimens are 736.6 MPa and 12.5%, respectively. After being hot corroded for 50 h, the tensile strength increases to 1022.9 MPa and elongation decreases to 1.7%. However, after being hot corroded for 150 h, both tensile strength and elongation of the repaired specimens drop to 955.8 MPa and 1.2%, respectively. The mechanical performance alteration is highly related to thermal effects instead of the molten salt attack.

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Section: Hot Corrosion Testingmentioning

confidence: 99%

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Zhang

Zhuang

et al. 2020

Materials

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“…The following compounds were identified after the 50th cycle, namely, Ni containing compounds: NiCr 2 O 4 and NiO; Cr-containing compounds: Cr 2 O 3, CrMoO 3 , Cr 3 C 2 , and Cr 23 C 6 ; Fe containing compound -Fe 2 O 3 ; Nb containing compound -NbNi 3 , Nb 21 S 8 ; Mn containing compound -MnO 2. However , XRD analysis has its limitation, i.e., it cannot identify the compounds when vol% of the compounds are less (>5%) [31]. So, apart from the above compounds, compounds such as Ni 3 V 2 O 8 , Na 2 CrO 4, Na 2 Cr 2 O 7, CrVO 4 , Cr 3 S 4 , FeS and versus might also form, as some traces of Fe, S and V elements are observed in figure 7 [31,32].…”

Section: Discussionmentioning

confidence: 99%

“…However , XRD analysis has its limitation, i.e., it cannot identify the compounds when vol% of the compounds are less (>5%) [31]. So, apart from the above compounds, compounds such as Ni 3 V 2 O 8 , Na 2 CrO 4, Na 2 Cr 2 O 7, CrVO 4 , Cr 3 S 4 , FeS and versus might also form, as some traces of Fe, S and V elements are observed in figure 7 [31,32].…”

Section: Discussionmentioning

confidence: 99%

“…The development of spinel NiCr 2 O 4 oxide on the surface of the substrates increases the oxidation resistance, as these oxides have a smaller diffusion coefficient for cations and anions than the patent oxides. Simultaneously, VO 3 in equation (5) form V 2 O 5, and also some V 2 O 5 from the MS reacts with protective NiO and Cr 2 O 3 oxides to form Ni 3 V 2 O 8 and CrVO 4 oxides, respectively [31]. Porcayo-Calderon et al [35] stated that even at different temperatures (700 °C, 800 °C, and 900 °C), Ni element in the surface form Ni oxide layer, which is rich in Ni, V and O content and the same had been reported by other researchers [31].…”

Section: Discussionmentioning

confidence: 99%

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Performance of air plasma sprayed Cr₃C₂–25NiCr and NiCrMoNb coated X8CrNiMoVNb16–13 alloy subjected to high temperature corrosion environment

Subramani

Munusamy

Manoharan

et al. 2022

Mater. Res. Express

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Thermal barrier coating plays a vital role in protecting materials' surfaces from high-temperature environment conditions. This work compares the demeanour of uncoated and air plasma sprayed Cr3C2-25NiCr and NiCrMoNb coated X8CrNiMoVNb16-13 substrates subjected to air oxidation and molten salt (Na2SO4 + 60%V2O5) environment condition at 900°C for 50 cycles. Coating characteristics have been analyzed through microstructure, thickness, porosity, hardness, and bond strength. SEM, EDS and XRD analysis were used to analyze corrosion's product at the end of the 50th cycle. Coating microstructures showed a uniform laminar structure that is adherent and denser with a coating thickness of 150 ± 20 μm and porosity less than 3.5%. The Microhardness of both the coated substrates were higher than that of the bare substrate. Cr3C2-25NiCr and NiCrMoNb coating bond strength was 38.9 MPa and 42.5 MPa. Thermogravimetric analysis showed the parabolic rate law of oxidation for all the substrates in both environments. In the molten salt environment, all the substrates exhibited higher weight gain compared to the air oxidation environment. In both environmental conditions, the uncoated X8CrNiMoVNb16-13 alloy exhibited higher weight gain than the coated substrates. The formation of Cr2O3, NiO and spinel oxide NiCr2O4 offers good resistance to corrosion to all the substrates in both the environmental condition. However, the presence of Mo and Nb significantly accelerated the corrosion of the substrate, thereby increasing the weight of the NiCrMoNb substrate. It is observed that Cr3C2-25NiCr and NiCrMoNb coating over the X8CrNiMoVNb16-13 substrate significantly protected the substrate against the hot corrosion than the bare alloy exposed to similar environmental conditions.

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“…Ni-based superalloys are widely used in the turbine blades of gas turbines and aircraft engines due to their excellent mechanical strength and oxidation resistance [1,2,3]. These materials, however, suffer serious corrosion in filed experiences [4,5,6]. Many researchers have focused on the high temperature oxidation behavior of Ni-based superalloy in pure O 2 or air [7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of GH4169 Alloy under Alternating Oxidation at 900 °C and Solution Immersion

Liu

et al. 2019

Materials

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In this paper, the corrosion behavior of GH4169 superalloy under alternating oxidation (at 900 °C) and solution immersion (in 3.5% NaCl solution, 30 ± 1 °C) has been studied by SEM, XRD, XPS, and electron probe microanalysis (EPMA). The results show that the alternating environment increases the corrosion rate of GH4169. The reaction of NaCl and Cr2O3 generates various volatile and soluble corrosion products, such as Na2Cr2O7, CrCl3, Cl2, and Na2CrO4, at a high temperature. The destruction of the protective Cr2O3 film leads to the increase of defects in the oxide scale, promoting the formation of oxides, such as NiO and Fe2O3, and changes the composition and structure of the oxide film. After repeated iterations, the mixed oxides will result in the spalling of the oxide film because they can reduce the fracture toughness of the corrosion scale. Therefore, the corrosion is comprehensively intensified.

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Influence of Two Different Salt Mixture Combinations of Na2SO4-NaCl-NaVO3 on Hot Corrosion Behavior of Ni-Base Superalloy Nimonic263 at 800 °C

Cited by 20 publications

References 41 publications

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Performance of air plasma sprayed Cr₃C₂–25NiCr and NiCrMoNb coated X8CrNiMoVNb16–13 alloy subjected to high temperature corrosion environment

Corrosion Behavior of GH4169 Alloy under Alternating Oxidation at 900 °C and Solution Immersion

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Influence of Two Different Salt Mixture Combinations of Na2SO4-NaCl-NaVO3 on Hot Corrosion Behavior of Ni-Base Superalloy Nimonic263 at 800 °C

Cited by 20 publications

References 41 publications

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Hot Corrosion and Mechanical Performance of Repaired Inconel 718 Components via Laser Additive Manufacturing

Performance of air plasma sprayed Cr3C2–25NiCr and NiCrMoNb coated X8CrNiMoVNb16–13 alloy subjected to high temperature corrosion environment

Corrosion Behavior of GH4169 Alloy under Alternating Oxidation at 900 °C and Solution Immersion

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Performance of air plasma sprayed Cr₃C₂–25NiCr and NiCrMoNb coated X8CrNiMoVNb16–13 alloy subjected to high temperature corrosion environment