Effects of silicon additions on the mechanical properties and microstructure of high speed steels

Pan, Fusheng; Peidao, Ding; Zhou, Shining; Mokuang, Kang; Edmonds, David

doi:10.1016/s1359-6454(97)00121-3

Cited by 34 publications

(23 citation statements)

References 11 publications

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“…Compared with the PM HSSs prepared from pre-alloyed powders using HIP [9], SLPS [7,8,26] or other densifying method [14,15,27,28], several crucial issues must be urgently considered and clarified upon DFT steels: 1) the densification behavior via solid state sintering (SSS), 2) the control of carbon, alloying elements and impurity elements (O,…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Fig. 4(c-e), the densification below liquidus radically avoids forming coarse carbides or eutectic ledeburites, which are inevitable during SLPS [9,14]. From the low-magnification fracture image in Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 91%

“…First, more LaB 6 additions lead to distinctly coarser carbides and tempered martensites (Fig.4), inherited from the coarsened austenites. In other words, with more LaB 6 , we obtain less grain boundaries and smaller amount of carbides, which play significant roles in inhibiting the recovery and recrystalization of martensites [9]. Second, the oxygen content linearly increases with LaB 6 additions.…”

Section: Accepted M Manuscriptmentioning

confidence: 92%

“…Ferrous HSS has been widely applied below 600 ℃, restrained by its inherent phase transitions (segregation, precipitation and recovery) at higher temperatures. Rong [9] demonstrated that experiencing at 700℃ for 1h, the plate martensite in as-tempered HSS had fully recovered and equiaxed grained ferrites had formed along with the precipitation and coarsening of secondary carbides, which are proved to be not controlled by carbon diffusion but by the volume diffusion of alloying elements [7]. Obviously, LaB 6 delays the hardness decrease of DFT HSSs via a latent mechanism.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…It means the accurate addition of the La and B sensitive to oxidation during smelting [9] can be easily achieved using DFT.…”

Section: The Role Of La and Bmentioning

confidence: 99%

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Direct fabrication of high-performance high speed steel products enhanced by LaB 6

et al. 2016

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A direct fabrication technology (DFT) without smelting has been developed for fabricating sophisticated high speed steel products with low pollution, near-net shaping and short process. The steel consisting of (wt. %): 6.4W, 5.0Mo, 4.2Cr, 3.1V, 8.5Co and 1.28C, was fabricated as exemplary material. The activated and reactive sintering of green compacts under vacuum with low activation energy, redox reaction enhanced diffusion and the construction of concentration gradient of alloying elements around pores, promotes the nearly full densification (>99.40%). Also, the DFT steels show high purity and superior mechanical properties. Minor strengthening agent LaB 6 (0.1 wt. %), which is easily to be accurately introduced in DFT, obviously increases the hot hardness, temper resistance, bend strength and toughness of DFT M3:2. The strengthening effect of boron atoms and La-rich complexes are proposed to directly result in the high hot hardness and temper resistance of LaB 6 containing steel.

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Section: Resultsmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 91%

Section: Accepted M Manuscriptmentioning

confidence: 92%

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…It means the accurate addition of the La and B sensitive to oxidation during smelting [9] can be easily achieved using DFT.…”

Section: The Role Of La and Bmentioning

confidence: 99%

See 3 more Smart Citations

Direct fabrication of high-performance high speed steel products enhanced by LaB 6

et al. 2016

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Effect of Secondary Aerosol Cooling on the Characteristics of Carbides in M42 High‐Speed Steel Produced by the Electroslag Remelting Withdrawal Process

Jiao

Tong

et al. 2020

steel research int.

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The characteristics of carbides, such as type, size, and distribution, are important factors that affect the quality of high‐speed steel. To improve the characteristics of carbides produced by the electroslag remelting (ESR) process, an innovative process of electroslag remelting withdrawal with secondary aerosol cooling (ESRW–SAC) is proposed. The structure of the molten bath is obtained using tungsten powder detection, and the characteristics of carbides are statistically quantified by scanning electron microscopy (SEM), X‐ray diffraction (XRD), and the Image‐Pro Plus quantitative analysis software. The 3D carbide morphologies and carbides types are determined by an electrolysis device and SEM–energy‐dispersive spectroscopy (EDS). The results show that, compared with the traditional process, without SAC, the structure of the molten metal bath becomes shallower and flatter with the ESRW–SAC process. Under the influence of SAC, the network spacing and lamellar thickness of carbides considerably decrease, the phase area of carbides increases, and the distribution of carbides becomes more uniform. After the ESRW–SAC process, M2C and M6C carbides are still dominant; however, the morphology of M2C carbides changes from a lamellar to a curved short‐rod form.

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Effect of Heat Treatment on Microstructure and Properties of Improved 40CrNi₂Si₂MoV Steel

Tang

et al. 2023

steel research int.

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Ultrahigh-strength steel (2000 MPa) is a key material widely used in national defense, aerospace, and various other sectors. This kind of steel is more likely to break as its strength increases. To improve its toughness, it is crucial to fully understand the strengthening and toughening mechanisms, microstructural evolution characteristics, and heat-treatment parameters of ultrahigh-strength steel. Herein, an improved 40CrNi 2 Si 2 MoV test steel is designed based on the composition of the 40CrNi 2 Si 2 MoV ultrahigh-strength martensitic steel and is subjected to quenching at 860/900/930/1050/1150 °C. The effects of microstructural changes on the test materials are analyzed using scanning electron microscopy, energy-dispersive X-ray spectroscopy, electron backscatter diffraction, transmission electron microscopy, and other characterization methods. The results show that at a quenching temperature of 1050 °C, the material exhibits an elongation of 8.2% and a strength as high as 2200 MPa owing to the coupled effects of complex multicomponent laths, substructures, dislocations, and nano-precipitates.

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Effects of silicon additions on the mechanical properties and microstructure of high speed steels

Cited by 34 publications

References 11 publications

Direct fabrication of high-performance high speed steel products enhanced by LaB 6

Direct fabrication of high-performance high speed steel products enhanced by LaB 6

Effect of Secondary Aerosol Cooling on the Characteristics of Carbides in M42 High‐Speed Steel Produced by the Electroslag Remelting Withdrawal Process

Effect of Heat Treatment on Microstructure and Properties of Improved 40CrNi₂Si₂MoV Steel

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Effects of silicon additions on the mechanical properties and microstructure of high speed steels

Cited by 34 publications

References 11 publications

Direct fabrication of high-performance high speed steel products enhanced by LaB 6

Direct fabrication of high-performance high speed steel products enhanced by LaB 6

Effect of Secondary Aerosol Cooling on the Characteristics of Carbides in M42 High‐Speed Steel Produced by the Electroslag Remelting Withdrawal Process

Effect of Heat Treatment on Microstructure and Properties of Improved 40CrNi2Si2MoV Steel

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Effect of Heat Treatment on Microstructure and Properties of Improved 40CrNi₂Si₂MoV Steel