Influence of tungsten on transformation characteristics in P92 ferritic–martensitic steel

Hajra, Raj Narayan; Kumar, Arun; Tripathy, Haraprasanna; Raju, S.; Saroja, S.

doi:10.1016/j.jallcom.2016.08.055

Cited by 21 publications

(9 citation statements)

References 25 publications

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“…The other reason that we choose W to alloying CrI 3 and CrGeTe 3 is that W can exhibit the same valence state (+3) and occupation state (d 3 ) as Cr in these systems. Note that although the W metal bulk is nonmagnetic, W has been widely used to synthesize alloys with strong magnetism, such as the martensite . To demonstrate our idea, here we focus on the case where the concentration of W is 50% (Figure d,e).…”

Section: Results and Discussionmentioning

confidence: 99%

Toward Intrinsic Room-Temperature Ferromagnetism in Two-Dimensional Semiconductors

et al. 2018

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Two-dimensional (2D) ferromagnetic semiconductors have been recognized as the cornerstone for next-generation electric devices, but the development is highly limited by the weak ferromagnetic coupling and low Curie temperature ( T). Here, we reported a general mechanism which can significantly enhance the ferromagnetic coupling in 2D semiconductors without introducing carriers. On the basis of a double-orbital model, we revealed that the superexchange-driven ferromagnetism is closely related to the virtual exchange gap, and lowering this gap by isovalent alloying can significantly enhance the ferromagnetic (FM) coupling. On the basis of the experimentally available two-dimensional CrI and CrGeTe, the FM coupling in two semiconducting alloy compounds CrWI and CrWGeTe monolayers are calculated to be enhanced by 3∼5 times without introducing any carriers. Furthermore, a room-temperature ferromagnetic semiconductor is achieved under a small in-plane strain (4%). Thus, our findings not only deepen the understanding of FM semiconductors but also open a new door for realistic spintronics.

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Section: Results and Discussionmentioning

confidence: 99%

Toward Intrinsic Room-Temperature Ferromagnetism in Two-Dimensional Semiconductors

et al. 2018

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“…The γ‐Fe was retained (termed the super‐cooled austenite) when the temperature was below the 780°C. The super‐cooled austenite transformed into the martensite at approximately 400°C . The microstructural schematic of as‐welding martensite is shown in Figure A.…”

Section: Resultsmentioning

confidence: 97%

“…The super-cooled austenite transformed into the martensite at approximately 400°C. 22 The microstructural schematic of as-welding martensite is shown in Figure 8A.…”

Section: Evolution Mechanism Of Dislocation and M 23 Cmentioning

confidence: 99%

Effect of Laves phase on the toughness of P92 weld metals

Wang

Liu

et al. 2018

Fatigue Fract Eng Mat Struct

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In this investigation, Laves phase was found to gradually precipitate from the tempered martensitic matrix of the two P92 weld metals (WMs) during the aging treatment. The particle size of Laves phase in the two WMs was ranged from 0.18 to 0.24 μm and was larger than the M23C6 particle size (ranged from 0.09 to 0.13 μm). The dislocation density of the two WMs was stable during aging. The hardness of the two WMs was stable during aging treatment, as the loss of solid solution strengthening was continuously compensated by the precipitation strengthening of Laves phase. The impact toughness of the two WMs declined gradually as the extending of aging time. The crack initiation zone and shear lip zone of the fracture surface were ductile fracture mode which consumed more fracture energy during impacting. The generation of Laves phase narrowed the crack initiation zone and shear lip zone and contributed to the decline of ductile fracture area percentage of aged WMs. The smaller ductile fracture area percentage contributed to the toughness reduction of aged WMs.

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“…Therefore, adjusting the δ-ferrite is essential for decreasing hot-working associated flaws [ 24 ]. The Ac 3 critical temperature is an essential parameter in casting, austenitizing, and annealing phenomena to make stable phases and remove brittle phases that reduce ductility and toughness [ 25 ]. As shown in Figure S3 , Ac 3 temperature ranges between 1100–1170 K for different alloying elements.…”

Section: Resultsmentioning

confidence: 99%

Strategies Regarding High-Temperature Applications w.r.t Strength, Toughness, and Fatigue Life for SA508 Alloy

2021

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In this work, the stabilities of secondary phases, including carbides, brittle phases, and inclusions, were simulated by computational thermodynamics. Calphad strategical optimization is preferable for all steel alloys regarding energy resource consumption during manufacturing and processing. The alloy composition has been changed to enhance the strength, hardenability, and longevity of a reactor pressure vessel (RPV) steel by computing the phase equilibrium calculations and predicting mechanical properties such as yield and tensile strengths hardness and martensitic and bainitic volume fractions. The stabilities of the pro-eutectoid carbides (cementite), inclusions, and brittle phases in SA508 steel are critical to the toughness and fatigue life related to the crack initiation and expansion of this steel. Overall, the simulations presented in this paper explain the mechanisms that can affect the fatigue resistance and toughness of steel and offer a possible solution to controlling these properties at elevated temperatures by optimizing the steel composition and heat treatment process parameters.

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Influence of tungsten on transformation characteristics in P92 ferritic–martensitic steel

Cited by 21 publications

References 25 publications

Toward Intrinsic Room-Temperature Ferromagnetism in Two-Dimensional Semiconductors

Toward Intrinsic Room-Temperature Ferromagnetism in Two-Dimensional Semiconductors

Effect of Laves phase on the toughness of P92 weld metals

Strategies Regarding High-Temperature Applications w.r.t Strength, Toughness, and Fatigue Life for SA508 Alloy

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