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Effect of tempering on hardness improvement in a VC/steel surface-alloyed material fabricated by high-energy electron-beam irradiation

Title
Effect of tempering on hardness improvement in a VC/steel surface-alloyed material fabricated by high-energy electron-beam irradiation
Authors
Euh, KKim, YCShin, KLee, SKim, NJ
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2003
Publisher
ELSEVIER SCIENCE SA
Abstract
The present study is concerned with the tempering effect in improving the hardness of a vanadium carbide (VC)/carbon steel surface-alloyed material fabricated by high-energy electron-beam irradiation. The mixture of VC powders and flux (50%MgO-50%CaO) was placed on a plain carbon steel substrate, and then electron beam was irradiated. The surface-alloyed layer of 1.8 min in thickness was homogeneously formed without defects. The microstructural analysis indicated that coarse VC particles were formed along solidification cell boundaries, and the matrix inside cells was mostly composed of lath-type martensite and fine cuboidal VC particles. A large amount of these VC particles in the lath-type martensitic matrix provided hardness four times greater than that of the substrate. When the VC/steel surface-alloyed material was tempered, fine VC particles precipitated in the tempered martensitic matrix, thereby leading to additional hardness increase. In addition, reduction of residual stress and an increase in fracture toughness could be expected. (C) 2002 Elsevier Science B.V. All rights reserved.
Keywords
surface alloyed material; electron beam irradiation; vanadium carbide; tempering; flux; hardness; secondary hardening; MICROSTRUCTURAL MODIFICATION; WEAR-RESISTANCE; STEEL; CARBON; LAYERS
URI
http://oasis.postech.ac.kr/handle/2014.oak/29840
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 346, no. 1-2, page. 228 - 236, 2003-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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