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Phase analysis of surface layers irradiated with high-energy electron beam using Mossbauer spectroscopy

Title
Phase analysis of surface layers irradiated with high-energy electron beam using Mossbauer spectroscopy
Authors
Choi, SJKwon, SJChoo, SHLee, S
POSTECH Authors
Kwon, SJLee, S
Date Issued
Jan-1999
Publisher
ELSEVIER SCIENCE SA
Abstract
The phases present in the surface layers of a plain carbon steel, a gray cast iron, and a TiB2/steel surface-alloyed material irradiated with high-energy electron beam were analyzed by Mossbauer spectroscopy in conjunction with the microstructural observation. When the plain carbon steel with ferrite-pearlite structure was irradiated with an electron beam, the pearlite region was transformed to martensite, while the ferrite region to bainite. In the case of the gray cast iron, the surface was melted and transformed into a mixed structure composed of ledeburite eutectic structure and of retained austenite. The surface layer of the TiB2/steel surface-alloyed material consisted of the melted and the transformed regions. The structures of both regions were identified to have ferrite-bainite-pearlite mixed structures from the Mossbauer analysis. The Mossbauer analysis data matched well with the microstructural observations of the irradiated surface layers, confirming that the Mossbauer analysis is quite useful in interpreting phase transformation upon electron beam irradiation. (C) 1999 Elsevier Science S.A. All rights reserved.
Keywords
gray cast iron; high-energy electron beam; Mossbauer spectroscopy; plain carbon steel; TiB2/steel surface-alloyed material; IRON-ALLOYS; CARBON; MARTENSITE
URI
http://oasis.postech.ac.kr/handle/2014.oak/21087
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 265, no. 1-2, page. 208 - 216, 1999-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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