Effects of Mn on the mechanical properties and high temperature oxidation of 9Cr2WVTa steel

Jin, Xiaojie; Chen, Shenghu; Rong, Lijian

doi:10.1016/j.jnucmat.2017.07.024

Cited by 33 publications

(5 citation statements)

References 42 publications

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“…Their durability is related to a very thin and protective passive film formed on the metal, which comprises a mixture of iron and chromium oxides [1,2]. Their good corrosion resistance, combined with their good mechanical properties over an extremely wide range of temperatures [3], as well as their oxidation resistance at very high temperatures [4], and their ease of maintenance and low life-cycle cost make stainless steels one of the most widely used materials. Hence, stainless steels are often used for very diverse applications, resulting in the possible exposure to aggressive conditions that can compromise their durability.…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Electrochemical Testing for Stainless-Steel Components with Complex Geometry Using Innovative Gel Electrolytes

Monrrabal

Ramírez-Barat²,

Bautista

et al. 2018

Metals

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Corrosion can be a problem for stainless steels in chloride-containing or other aggressive environments, especially when they are formed as components with complex shapes. Monitoring the corrosion performance of the stainless steels during their in-service life is not always an easy task. Traditional electrochemical cells can be difficult to adapt to complex surfaces, and undesired crevices or liquid electrolyte leaks can occur. In the presented work, the possible use of non-destructive techniques with innovative gel electrolytes was investigated using portable cells. The electrolytes were based on agar (used as a gelling agent with ionic conductivity), glycerol (a plasticizer that improves adaptability to complex surfaces), and NaCl or KClO 4 salts (which improve the conductivity and control the aggression of the tests). X-ray photoelectron spectroscopy (XPS) and Mott-Schottky analysis were carried out to obtain information about the influence of the electrolyte on the passive layer. The oxygen concentration and conductivity in the gels with various glycerol contents were compared to those in liquid electrolytes. Electrochemical impedance spectroscopy (EIS) measurements were carried out in liquids and gels. The performance of the gel cell on a stainless-steel component with a weld and complex shape was checked. The variation in the sensitivity of gels with and without chlorides to identify corrosion-susceptible regions was tested.

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Section: Introductionmentioning

confidence: 99%

Non-Destructive Electrochemical Testing for Stainless-Steel Components with Complex Geometry Using Innovative Gel Electrolytes

Monrrabal

Ramírez-Barat²,

Bautista

et al. 2018

Metals

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“…X. Jin et al studied the effect of Mn on the mechanical properties and high-temperature oxidation of 9Cr2WVTa steel. When the content of Mn is between 0.04–0.93 wt.%, the high-temperature oxidation resistance of the alloy is significantly improved with the increase in Mn content [ 15 ]. Mo can improve the oxidation resistance of the steel for 10 h below 900 °C; if above 900 °C, the high molybdenum content tends to segregate and form intermetallic compounds, reducing the oxidation resistance and making it crack during hot working [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation Behavior of Cr-Ni-Mo Hot-Work Die Steels

Zhang

et al. 2022

Materials

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The oxidation of 3Cr3Mo2NiW and 3CrNi3Mo steels was studied at 600 °C in air, and the test results suggest that the parabolic rate law fitted the oxidation kinetics of both steels. The microstructure, morphology, structure, and phase composition of the oxide film cross-sectional layers of the two Cr-Ni-Mo hot-work die steels were analyzed using scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), and X-ray diffraction (XRD). The influences of Cr, Ni, and Mo on the high-temperature oxidation resistance of the two Cr-Ni-Mo hot-work die steels are discussed, and the oxidation mechanism is summarized. Heat-treated samples were analyzed using electron backscattered diffraction (EBSD) to obtain inverse pole figures (IPFs) and average sample grain sizes, and the percentages of twin grain boundaries (TGBs) (θ = 60°) were also measured. After heat treatment, recrystallization was observed in both steels with a large portion of twin grain boundaries. After 10 h of oxidation, the dense chromium-rich oxide layer that formed in the inner oxide layer of 3Cr3Mo2NiW steel effectively prevented the continuation of oxidation. The inner oxide layer in 3CrNi3Mo steel formed an adhesion layer with a network structure composed mainly of Ni- and Cr-rich spinel oxide, without forming a barrier to prevent oxidation.

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“…There is a critical Cr concentration (~12 w/%) for the formation of a protective Cr 2 O 3 surface layer. 20 Small amounts of Mn can lower the critical Cr concentration. A thin compact oxide layer forms, mostly composed of Mn-Cr spinels and Cr-rich oxides, which improve the high-temperature oxidation resistance.…”

Section: Introductionmentioning

confidence: 99%

High-temperature oxidation of four hot-work tool steels

Balaško¹,

Burja²,

Medved³

2018

Mater. Tehnol.

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Hot-work tool steels have very good mechanical properties, especially strength, hardness and wear resistance at high temperatures. Therefore, hot-work tool steels are used for different applications, such as the high-pressure die casting of light alloys, the extrusion of polymers and forging. Since all these processes are operating at high temperatures, the main focus of this research was to investigate the high-temperature oxidation resistance of tool steels. We investigated the high-temperature oxidation at two different temperatures: 500°C and 700°C. The following tool steels were analyzed: HTCS-130, W600, RavnexHD and Dievar. Tests were made in an air atmosphere, while the heating and cooling were made in a controlled argon atmosphere. Simultaneous thermal analysis (STA 449 C Jupiter), scanning electron microscopy (SEM and EDS) and X-ray diffraction were used as the investigation methods. The results showed that during high-temperature oxidation at 500°C Dievar steel has the best oxidation resistance, followed by RavnexHD, HTCS-130 and W600. However, at 700°C the results were different, HTCS-130 had the best oxidation resistance, followed by Dievar, W600 and RavnexHD.

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Effects of Mn on the mechanical properties and high temperature oxidation of 9Cr2WVTa steel

Cited by 33 publications

References 42 publications

Non-Destructive Electrochemical Testing for Stainless-Steel Components with Complex Geometry Using Innovative Gel Electrolytes

Non-Destructive Electrochemical Testing for Stainless-Steel Components with Complex Geometry Using Innovative Gel Electrolytes

High-Temperature Oxidation Behavior of Cr-Ni-Mo Hot-Work Die Steels

High-temperature oxidation of four hot-work tool steels

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