Microstructure modifications and corrosion behaviors of Cr4Mo4V steel treated by high current pulsed electron beam

Xu, Fangjun; Guang-wei, Guo; Tang, Guangze; Ma, Xinxin; Wang, Liqin; Ozur, G. E.; Yukimura, Ken

doi:10.1016/j.matchemphys.2010.12.016

Cited by 20 publications

(12 citation statements)

References 17 publications

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“…Phase content in the initial steel is mainly tempered martensite as well as small amount of carbides [13]. Bright field TEM images of the untreated M50 steel are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Mechanisms of microstructure formations in M50 steel melted layer by high current pulsed electron beam

Tang¹,

Fan

et al. 2012

Nuclear Instruments and Methods in Physics Research Section B:

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“…Phase content in the initial steel is mainly tempered martensite as well as small amount of carbides [13]. Bright field TEM images of the untreated M50 steel are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Mechanisms of microstructure formations in M50 steel melted layer by high current pulsed electron beam

Tang¹,

Fan

et al. 2012

Nuclear Instruments and Methods in Physics Research Section B:

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“…In this paper, halo formation on the surfaces of hypereutectic Al-17.5Si alloys was observed and characterized after bombardment with a high-current pulsed electron beam (HCPEB). HCPEB bombardment has been investigated as a potential method for surface modification of materials in recent years [8][9][10][11][12]. Alloy surfaces are prone to nanocrystallization due to the rapid melting and cooling processes induced by HCPEB.…”

Section: Introductionmentioning

confidence: 99%

Halo Evolution of Hypereutectic Al‐17.5Si Alloy Treated with High‐Current Pulsed Electron Beam

Gao

et al. 2015

Journal of Nanomaterials

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Halo evolution of an Al-17.5Si alloy surface after treatment with increasing pulse numbers of a high-current pulsed electron beam (HCPEB) was investigated. A halo is a ring microstructure resembling a bull’s eye. SEM results indicate that the nanocrystallization of halo induced by HCPEB treatment leads to gradual diffusion of the Si phase. Multiple pulses numbers cause the Si phase to be significantly refined and uniformly distributed. In addition, nanosilicon particles with a grain size of 30~100 nm were formed after HCPEB treatment, as shown by TEM observation. XRD results indicate that Si diffraction peaks broadened after HCPEB treatment. The microhardness tests demonstrate that the microhardness at the midpoint from the halo edge to center decreased sharply from 9770.7 MPa at 5 pulses to 2664.14 MPa at 25 pulses. The relative wear resistance of a 15-pulse sample is effectively improved by a factor of 6.5, exhibiting optimal wear resistance.

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“…The electron beam irradiation causes a near-surface layer (several microns) to melt and erupt [6,[24][25][26]. As a result, large numbers of crater-like cavities are formed, which are commonly the most typical feature of HCPEB-treated surfaces [8,15,[24][25][26][27][28][29], and are also viewed as a category of surface defect [12,30]. The cavity size is greatly influenced by irradiation parameters and substrate materials, with diameters ranging from several microns [30] to tens of microns [15,25,26,28,31,32], even to a few hundred microns [6,29], and depth from a few microns [26,29,32] to tens of microns [24].…”

Section: Introductionmentioning

confidence: 99%

“…The cavity size is greatly influenced by irradiation parameters and substrate materials, with diameters ranging from several microns [30] to tens of microns [15,25,26,28,31,32], even to a few hundred microns [6,29], and depth from a few microns [26,29,32] to tens of microns [24]. The amount of cavities is intimately dependent on the HCPEB pulse number [6,8,12,24,[27][28][29][30]32] and energy density [29,30,33]. In particular, the presence of crater-like cavities makes the irradiated surfaces resemble textured ones from the viewpoint of tribology [27,28,[30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Texturing Effect of Crater-Like Cavities Induced by High-Current Pulsed Electron Beam (HCPEB) Irradiation

Tang

Zhao

et al. 2018

Coatings

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High-current pulsed electron beam (HCPEB) irradiation commonly induces crater-like cavities on irradiated surfaces, making them tribologically resemble textured ones. However, the effect of crater-like cavities on the lubricated tribological properties of HCPEB-treated surfaces has not been reported in the literature. This work was aimed at exploring the potential texturing effect of the crater-like cavities. Surfaces with continuous and uniform crater-like cavities were prepared through HCPEB irradiating a 400-nm thick Ta coating that was pre-deposited on polished M50 steel. Their boundary tribological behaviors were studied while sliding in chemically inert, low-viscosity hydrocarbon fuel JP-10 against a Si3N4 ball under 2.0–4.0 GPa. At 2.0 GPa, the coefficient of friction (COF) and wear rate of the polished M50 steel were above 0.16 on average, with large fluctuation, and 1.49 × 10−5 mm3/N·m (a rectangle-like profile of 167.9 μm × 8.1 μm), respectively. In comparison, the HCPEB-treated Ta coating had a stable, marginally fluctuant COF of 0.11 and a near-zero wear rate. Under other higher loads, the HCPEB-treated Ta coating still exhibited a stable COF of 0.11 on average with small fluctuation, and its wear track width was only half that of the M50 steel. The analysis of the wear topographies indicates that the substantial reduction in both the COF and wear rate was mainly due to the texturing effect originating from the crater-like cavities.

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Microstructure modifications and corrosion behaviors of Cr4Mo4V steel treated by high current pulsed electron beam

Cited by 20 publications

References 17 publications

Mechanisms of microstructure formations in M50 steel melted layer by high current pulsed electron beam

Mechanisms of microstructure formations in M50 steel melted layer by high current pulsed electron beam

Halo Evolution of Hypereutectic Al‐17.5Si Alloy Treated with High‐Current Pulsed Electron Beam

Texturing Effect of Crater-Like Cavities Induced by High-Current Pulsed Electron Beam (HCPEB) Irradiation

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