Influence of Thermal Treatment on SCC and HE Susceptibility of Supermartensitic Stainless Steel 16Cr5NiMo

Bacchi, Linda; Biagini, Fabio; Corsinovi, Serena; Romanelli, Marco; Villa, Michele; Valentini, Renzo

doi:10.3390/ma13071643

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…Thermal treatment is the second way to obtain a compromise between mechanical properties, tribology, and resistance against corrosion. Heat treatment parameters must be chosen carefully such as austenitizing temperature, time, and cooling speed to ensure complete martensitic transformation and to avoid carbide precipitation and δ-ferrite formation during cooling stages [6][7][8]. The ideal microstructure will possess combination of strength, ductility, toughness and hardness i.e.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Dry Sliding Wear Performance and Corrosion Resistance of 13Cr5Ni2Mo Supermartensitic Stainless Steel

Beliardouh¹,

Tlili²,

Oulabbas³

et al. 2021

Tribol. Ind.

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This work aimed to study the microstructure, wear and corrosion resistance of supermartensitic stainless steel (SMSS). Heat treatment applied to samples consists of quenching after austenitization at elevated temperature (1250 °C) followed by a double tempering at 650 °C. Conventional mechanical properties, scanning electron microscopy (SEM/EDS) analysis and X-ray diffraction methods (XRD) are used to analyze the microstructure and to evaluate the wear mechanisms. The potentiodynamic polarisation and the electrochemical impedance spectroscoopy (EIS) methods are used to evaluate the corrosion resistance in both the 0.5M H2SO4 and 0.5M NaCl aggressive media. The microstructure is mainly composed with tempered lath martensite, small quantity of retained austenite and carbides. Oxidative and abrasive wear dominated the wear process in dry condition. During the corrosion process, the same mechanism of degradation was found in both the 0.5M NaCl and 0.5M H2SO4.

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Section: Introductionmentioning

confidence: 99%

Investigation on Dry Sliding Wear Performance and Corrosion Resistance of 13Cr5Ni2Mo Supermartensitic Stainless Steel

Beliardouh¹,

Tlili²,

Oulabbas³

et al. 2021

Tribol. Ind.

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“…The mechanical properties of these steels are highly dependent on their microstructural characteristics, such as volume fraction, morphology, and distribution of constituents, which, in turn, are determined by the reversed austenite condition at the intercritical temperature. Because of the significant influence on the final microstructure and mechanical properties of low-carbon martensitic stainless steels, the formation of reversed austenite in the intercritical temperature range has been widely studied in recent decades [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Reversed Austenite Evolution during Intercritical Tempering of Low-Carbon Martensitic Stainless Steel

Huo,

Peng,

Chen

et al. 2024

Materials

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Since the formation of reversed austenite during critical tempering treatment is an important factor affecting the mechanical properties of 13Cr4Ni martensitic stainless steel, a detailed study of the content and morphology of reversed austenite in heat treatment is needed. In this study, the variation curves of a reversed austenite volume fraction with holding time at different tempering temperatures were measured by in situ X-ray diffraction (XRD), and the reversed austenite and carbides of each process were evaluated by transmission electron microscopy (TEM). The austenite content shows a parabolic change with the increase in the tempering temperature; the maximum can reach a peak of about 6.8% at 610 °C, and drops to 0% at 660 °C. It also shows a parabolic change with the extension of the holding time, reaching a maximum of about 9.2% at 5 h of holding time, and a decreasing trend at 10 h of holding time, about 6.8%. The results show that the precipitation of carbides in the microstructure causes elemental segregation at grain boundaries and inside, which is one of the main factors affecting the thermal stability of reversed austenite formation. The kinetic process of reversed austenite during the tempering process was simulated using the JMAK model and the KM model, which can describe the trend of reversed austenite content during the tempering process. Combining the two models, a mathematical model for the room-temperature reversed austenite content under different processes was obtained, and this can predict the room-temperature austenite content.

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“…Retained austenite significantly increases the hydrogen solubility and decreases ductility of a hydrogen charged martensitic steel [17]. Failure due to hydrogen embrittlement can occur particularly when strain-induced martensite forms in austenite grains [18]. The freshly formed martensite then has a high concentration of hydrogen, which considerably facilitates cracking [19].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Uptake and Embrittlement of Carbon Steels in Various Environments

Trautmann

Mori

Oberndorfer³

et al. 2020

Materials

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To avoid failures due to hydrogen embrittlement, it is important to know the amount of hydrogen absorbed by certain steel grades under service conditions. When a critical hydrogen content is reached, the material properties begin to deteriorate. The hydrogen uptake and embrittlement of three different carbon steels (API 5CT L80 Type 1, P110 and 42CrMo4) was investigated in autoclave tests with hydrogen gas (H2) at elevated pressure and in ambient pressure tests with hydrogen sulfide (H2S). H2 gas with a pressure of up to 100 bar resulted in an overall low but still detectable hydrogen absorption, which did not cause any substantial hydrogen embrittlement in specimens under a constant load of 90% of the specified minimum yield strength (SMYS). The amount of hydrogen absorbed under conditions with H2S was approximately one order of magnitude larger than under conditions with H2 gas. The high hydrogen content led to failures of the 42CrMo4 and P110 specimens.

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Influence of Thermal Treatment on SCC and HE Susceptibility of Supermartensitic Stainless Steel 16Cr5NiMo

Cited by 11 publications

References 22 publications

Investigation on Dry Sliding Wear Performance and Corrosion Resistance of 13Cr5Ni2Mo Supermartensitic Stainless Steel

Investigation on Dry Sliding Wear Performance and Corrosion Resistance of 13Cr5Ni2Mo Supermartensitic Stainless Steel

Numerical Simulation of Reversed Austenite Evolution during Intercritical Tempering of Low-Carbon Martensitic Stainless Steel

Hydrogen Uptake and Embrittlement of Carbon Steels in Various Environments

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