Structure and microstructure evolution of a ternary Fe–Cr–Ni alloy akin to super martensitic stainless steel

Kumar, B. Ravi; Sharma, Sagar; Munda, Parikshit; Minz, R. K.

doi:10.1016/j.matdes.2013.03.035

Cited by 34 publications

(6 citation statements)

References 24 publications

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“…In step (4), after AOD slagging, the molten steel was put into an LF furnace with synthetic slag added, and then the alloy composition was adjusted. In the final step (5), heating and argon-blowing refining were carried out to deoxidize, desulfurize and remove other harmful impurities. The Nb-based secondary carbides/nitrides phases need very high austenitizing temperatures, due to the solidification solution of the Nb element with a high melting point.…”

Section: Sample Preparation and Initial Properties 211 Casting Process And Chemical Composition Of X6crnimovnb11-2 Steelmentioning

confidence: 99%

“…The iron-chromium-carbon ternary alloys of martensitic stainless steel have garnered great interest in recent years due to their superior mechanical properties, such as corrosion resistance, high strength and good toughness, which can be enhanced through high-density nanophase precipitation by heat treatment [1,2]. The Fe-Cr-Ni-Mo alloy is designated as a superalloy martensitic stainless steel (SSC) [3][4][5]. In the heat treatment of the majority of Fe-Cr-Ni ternary and Fe-Cr-Ni-Mo multicomponent alloys, nickel-base intermetallic phases (e.g., NiFe, NiMn, Ni 3 V, Ni 3 Mo, and Ni 3 Nb) are probably formed, and only the metastable phases Ni 3 Mo and the stable Laves phases Fe 2 Mo are formed in Fe-Ni-Mo steels [1,[4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The Fe-Cr-Ni-Mo alloy is designated as a superalloy martensitic stainless steel (SSC) [3][4][5]. In the heat treatment of the majority of Fe-Cr-Ni ternary and Fe-Cr-Ni-Mo multicomponent alloys, nickel-base intermetallic phases (e.g., NiFe, NiMn, Ni 3 V, Ni 3 Mo, and Ni 3 Nb) are probably formed, and only the metastable phases Ni 3 Mo and the stable Laves phases Fe 2 Mo are formed in Fe-Ni-Mo steels [1,[4][5][6][7]. Martensitic stainless steel underwent the evolution of a series of stainless steels, such as: 1Cr13, 2Cr13Mo, 1Cr17Ni2, 00Cr13Ni5Mo, 00Cr14Ni6Mo2AlNb, P91, and 12CrMoV [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…In the heat treatment of the majority of Fe-Cr-Ni ternary and Fe-Cr-Ni-Mo multicomponent alloys, nickel-base intermetallic phases (e.g., NiFe, NiMn, Ni 3 V, Ni 3 Mo, and Ni 3 Nb) are probably formed, and only the metastable phases Ni 3 Mo and the stable Laves phases Fe 2 Mo are formed in Fe-Ni-Mo steels [1,[4][5][6][7]. Martensitic stainless steel underwent the evolution of a series of stainless steels, such as: 1Cr13, 2Cr13Mo, 1Cr17Ni2, 00Cr13Ni5Mo, 00Cr14Ni6Mo2AlNb, P91, and 12CrMoV [1][2][3][4][5][6][7]. With its high strength, good hardenability and creep resistance, X6CrNiMoVNb11-2 steel (06Cr11Ni2MoVNb in the CN system) is often used in aero engine turbine discs, large gas turbines, turbine blades, nuclear power equipment, and corrosionresistant oil pipelines.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution and Mechanical Properties of X6CrNiMoVNb11-2 Stainless Steel after Heat Treatment

Xia

2021

Materials

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X6CrNiMoVNb11-2 supermartensitic stainless steel, a special type of stainless steel, is commonly used in the production of gas turbine discs in liquid rocket engines and compressor disks in aero engines. By optimizing the parameters of the heat-treatment process, its mechanical properties are specially adjusted to meet the performance requirement in that particular practical application during the advanced composite casting-rolling forming process. The relationship between the microstructure and mechanical properties after quenching from 1040 °C and tempering at 300–670 °C was studied, where the yield strength, tensile strength, elongation and impact toughness under different cooling conditions are obtained by means of mechanical property tests. A certain amount of high-density nanophase precipitation is found in the martensite phase transformation through the heat treatment involved in the quenching and tempering processes, where M23C6 carbides are dispersed in lamellar martensite, with the close-packed Ni3Mo and Ni3Nb phases of high-density co-lattice nanocrystalline precipitation created during the tempering process. The ideal process parameters are to quench at 1040 °C in an oil-cooling medium and to temper at 650 °C by air-cooling; final hardness is averaged about 313 HV, with an elongation of 17.9%, the cross-area reduction ratio is 52%, and the impact toughness is about 65 J, respectively. Moreover, the tempered hardness equation, considering various tempering temperatures, is precisely fitted. This investigation helps us to better understand the strengthening mechanism and performance controlling scheme of martensite stainless steel during the cast-rolling forming process in future applications.

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Section: Sample Preparation and Initial Properties 211 Casting Process And Chemical Composition Of X6crnimovnb11-2 Steelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution and Mechanical Properties of X6CrNiMoVNb11-2 Stainless Steel after Heat Treatment

Xia

2021

Materials

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“…It is known that alloying elements impact the formation of reversed austenite, and much attention is given now to the research of alloying elements for the nucleation and growth of reversed austenite. The alloying elements used most often in SMSS are nickel, molybdenum and chromium [7,8]. It was demonstrated that Ni can promote the phase transformation of α – γ processed by tempering, at the same time the enrichment of Ni can provide the energy for reversed austenite nucleation.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of Cu and Ni on the formation of reversed austenite in super martensitic stainless steel

Jiang

et al. 2018

Ironmaking & Steelmaking

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The interplay of Cu and Ni on the formation of reversed austenite in super martensitic stainless steel (SMSS) was discussed in this study. Ni concentration in reversed austenite increases from 9.93 to 11.96 wt-% as Cu content increases from 1.5 to 3 wt-%, while Cu concentration increases from 1.43 to 1.89 wt-% as Ni increases from 5 to 6.5 wt-%. The enrichment of Ni and Cu in reversed austenite is much higher than that in martensite matrix. Reversed austenite formed in the dispersion area of ε-Cu inherits the twinning structure of ε-Cu and the crystal orientation relationship with the matrix during tempering. So Cu helps increase the enrichment of Ni, which in turn promotes Cu enrichment and induces the precipitation of ε-Cu due to the reduction of interfacial energy for reversed austenite formation. Our work reveals the synergism of Cu and Ni on the formation of reversed austenite.

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Effect of titanium nitride (TiN) on the corrosion behavior of a supermartensitic stainless steel

Rodrigues

Bandeira

Duarte

et al. 2018

Materials & Corrosion

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This study evaluates the effect of high N, Ni, and Ti contents on the microstructure and corrosion properties of a supermartensitic stainless steel when immersed in a 3.5% NaCl solution. Tempering procedure at several temperatures resulted in a martensitic microstructure composed of grains ranging from 60 to 70 μm, TiN microparticles, and austenite. The sample treated at 610 °C showed better corrosion resistance due to the lower current density of the anodic polarization curve and less negative pitting potential, which was thoroughly influenced by the content of austenite (6.2 vol%). Anodic curves presented current fluctuation attributed to the presence of passive film instability, due to micro‐galvanic corrosion between TiN particles and matrix. Impedance analysis on the sample tempered at 610 °C confirmed that 6.2 vol% of austenite assists the protective film by making it thicker and more protective in chloride media.

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Structure and microstructure evolution of a ternary Fe–Cr–Ni alloy akin to super martensitic stainless steel

Cited by 34 publications

References 24 publications

Microstructure Evolution and Mechanical Properties of X6CrNiMoVNb11-2 Stainless Steel after Heat Treatment

Microstructure Evolution and Mechanical Properties of X6CrNiMoVNb11-2 Stainless Steel after Heat Treatment

Synergistic effect of Cu and Ni on the formation of reversed austenite in super martensitic stainless steel

Effect of titanium nitride (TiN) on the corrosion behavior of a supermartensitic stainless steel

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