Electron Beam Surface Ceramic-Alloying

Peng, Qichun; Bloyce, A.; Bell, Thomas A.

doi:10.4028/www.scientific.net/kem.46-47.455

Cited by 5 publications

(3 citation statements)

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“…[11] Upon irradiation, the process parameters, except beam power, were fixed to the optimum conditions established in the institute, as shown in Table I. [10,14] Beam power, which is decisive to heat input subjected to the sam- ple, was varied in the range from 6580 to 9940 W. The process parameters, such as beam power (P), beam travel speed (v), and transverse scanning width of electron beam (l), can be assembled into a normalized parameter, viz., input energy density, W 0 , via the following equation:…”

Section: Methodsmentioning

confidence: 99%

“…[11][12][13][14] The present article reports on a study of high-energy electron beam irradiation of a DCI roll and clarifies the role of the microstructural factors on surface hardening. [11][12][13][14] The present article reports on a study of high-energy electron beam irradiation of a DCI roll and clarifies the role of the microstructural factors on surface hardening.…”

Section: Introductionmentioning

confidence: 99%

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Surface hardening of a ductile-cast iron roll using high-energy electron beams

Suh

Lee

Koo

et al. 1997

Metall Mater Trans A

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The effects of high-energy electron beam irradiation on surface hardening and microstructural modification in a ductile cast iron (DCI) roll are investigated in this study. The DCI roll samples were irradiated by using an electron accelerator (1.4 MeV), and then their microstructures and hardnesses were examined. Upon irradiation, the unirradiated microstructure containing graphites and the tempered bainite matrix was changed to martensite, ledeburite, and retained austenite, together with the complete or partial dissolution of graphites. This microstructural modification improved greatly the surface hardness due to transformation of martensite whose amount and type were determined by heat input during irradiation. In order to investigate these complex microstructures, a simulation test including thermal cycles of abrupt heating and quenching was carried out. The simulation results indicated that the irradiated surface was heated up to about 1100 ЊC to 1200 ЊC and then quenched to room temperature, which was enough to obtain surface hardening through martensitic transformation. Thermal analysis of the irradiated surface layer was also carried out using a finite difference method to understand the surface hardening of the DCI roll and to compare with the simulation test results.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface hardening of a ductile-cast iron roll using high-energy electron beams

Suh

Lee

Koo

et al. 1997

Metall Mater Trans A

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“…This can provide a very powerful heat source, which in turn can be applied to surface treatment, welding, and joining of structural materials. [3,4,5] Furthermore, it has many advantages such as homogeneous heating and cooling and continuous surface processing of very large structures or parts in air without serious surface oxidation. [6] Upon irradiation by high-energy electron beam, the temperature of the irradiated surface rises easily to high temperatures over the austenite range, and then drops quickly to room temperature since the temperature of the interior bulk material maintains constantly at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructural modification of plain carbon steels irradiated by high-energy electron beam

Suh

Lee²,

Koo

1997

Metall Mater Trans A

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The main objective of the present study is to analyze the microstructural modification of the surface hardened by the irradiation of high-energy electron beam in 0.18 pct C and 0.38 pct C plain carbon steels. Steel samples were irradiated using an electron accelerator (1.4 MeV), and the detailed microstructures of the irradiated surface were examined. Upon irradiation, the ferrite-pearlite structure near the sample surface was changed to the dual-phase structure, i.e., ferrite and martensite, and fine particles or needlelike lamellae were observed in the ferrite/martensite interface. In order to investigate these complex microstructures as well as the martensitic transformation mechanism, the simulation test, including thermal cycles of abrupt heating and quenching, was carried out. The test results indicated that the irradiated surface was heated up to about 1100ЊC and then quenched to room temperature, which was enough to obtain the surface hardening through martensitic transformation. Thermal analysis of the irradiated surface was also carried out for systematic understanding of the microstructural modification in terms of the irradiation parameters such as beam travel speed.

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