Abstract
The surface morphology, chemical composition and microstructural evolution of the near-surface (up to 0.5 μm) layers of austenitic stainless steels (SS) 304L and 316L irradiated with a pulsed (2.5 μs) low-energy (20-30 keV), high-current (up to 30 kA) electron beam (2-10 J/cm2) have been studied. It was revealed that the cratering on irradiation caused by the local overheating followed by explosive ejection of the material at the sites of localization of low-melting-point second-phase (e.g. FeS2) particles having a low-thermal-conductivity occurs. The plate rolling stock SS 304L cratered far less than the rod stock one. Multiply repeated pulsed melting of SS 304L (plate) and 316L (rod) almost completely suppresses cratering and reduces the surface roughness compared to the untreated surface. Surface smoothing is accompanied by cleaning of the near-surface (≈50 nm) layer from O, C and N. As a result of fast (∼109 K/s) quenching from the melt, in the near-surface (≈0.5 μm) layer, a single-phase (γ) microstructure is formed with a grain size of 0.2-0.6 μm, which is almost two orders of magnitude lower compared to the untreated SS. The formation of such substructure allows to considerably enhance the electric strength of vacuum insulation and corrosion resistance of SS.
| Original language | English |
|---|---|
| Pages (from-to) | 382-386 |
| Number of pages | 5 |
| Journal | Surface and Coatings Technology |
| Volume | 180-181 |
| DOIs | |
| Publication status | Published - 1 Mar 2004 |
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Keywords
- Austenitic stainless steels
- Pulsed electron beam
- Pulsed melting
- Surface modification
ASJC Scopus subject areas
- Chemistry(all)
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry
Cite this
Microstructure of the near-surface layers of austenitic stainless steels irradiated with a low-energy, high-current electron beam. / Rotshtein, V. P.; Ivanov, Yu F.; Proskurovsky, D. I.; Karlik, K. V.; Shulepov, I. A.; Markov, A. B.
In: Surface and Coatings Technology, Vol. 180-181, 01.03.2004, p. 382-386.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Microstructure of the near-surface layers of austenitic stainless steels irradiated with a low-energy, high-current electron beam
AU - Rotshtein, V. P.
AU - Ivanov, Yu F.
AU - Proskurovsky, D. I.
AU - Karlik, K. V.
AU - Shulepov, I. A.
AU - Markov, A. B.
PY - 2004/3/1
Y1 - 2004/3/1
N2 - The surface morphology, chemical composition and microstructural evolution of the near-surface (up to 0.5 μm) layers of austenitic stainless steels (SS) 304L and 316L irradiated with a pulsed (2.5 μs) low-energy (20-30 keV), high-current (up to 30 kA) electron beam (2-10 J/cm2) have been studied. It was revealed that the cratering on irradiation caused by the local overheating followed by explosive ejection of the material at the sites of localization of low-melting-point second-phase (e.g. FeS2) particles having a low-thermal-conductivity occurs. The plate rolling stock SS 304L cratered far less than the rod stock one. Multiply repeated pulsed melting of SS 304L (plate) and 316L (rod) almost completely suppresses cratering and reduces the surface roughness compared to the untreated surface. Surface smoothing is accompanied by cleaning of the near-surface (≈50 nm) layer from O, C and N. As a result of fast (∼109 K/s) quenching from the melt, in the near-surface (≈0.5 μm) layer, a single-phase (γ) microstructure is formed with a grain size of 0.2-0.6 μm, which is almost two orders of magnitude lower compared to the untreated SS. The formation of such substructure allows to considerably enhance the electric strength of vacuum insulation and corrosion resistance of SS.
AB - The surface morphology, chemical composition and microstructural evolution of the near-surface (up to 0.5 μm) layers of austenitic stainless steels (SS) 304L and 316L irradiated with a pulsed (2.5 μs) low-energy (20-30 keV), high-current (up to 30 kA) electron beam (2-10 J/cm2) have been studied. It was revealed that the cratering on irradiation caused by the local overheating followed by explosive ejection of the material at the sites of localization of low-melting-point second-phase (e.g. FeS2) particles having a low-thermal-conductivity occurs. The plate rolling stock SS 304L cratered far less than the rod stock one. Multiply repeated pulsed melting of SS 304L (plate) and 316L (rod) almost completely suppresses cratering and reduces the surface roughness compared to the untreated surface. Surface smoothing is accompanied by cleaning of the near-surface (≈50 nm) layer from O, C and N. As a result of fast (∼109 K/s) quenching from the melt, in the near-surface (≈0.5 μm) layer, a single-phase (γ) microstructure is formed with a grain size of 0.2-0.6 μm, which is almost two orders of magnitude lower compared to the untreated SS. The formation of such substructure allows to considerably enhance the electric strength of vacuum insulation and corrosion resistance of SS.
KW - Austenitic stainless steels
KW - Pulsed electron beam
KW - Pulsed melting
KW - Surface modification
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UR - http://www.scopus.com/inward/citedby.url?scp=16744364439&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2003.10.089
DO - 10.1016/j.surfcoat.2003.10.089
M3 - Article
AN - SCOPUS:16744364439
VL - 180-181
SP - 382
EP - 386
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
SN - 0257-8972
ER -