고에너지 전자빔투사방법으로 제조된 (Cr3C2,CrB)탄소강 표면복합재료의 경도와 내마모성 (Hardness and Wear Resistance of (Cr3C2,CrB)/Steel Surface Composites Fabricatedby High-Energy Electron Beam Irradiation)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 44권 / 4호 / 243 ~ 251페이지
· 저자명 : 남덕현, 이규홍, 이성학

초록

The present study is concerned with the improvement of hardness and wear resistance in
(Cr3C2,CrB)/carbon steel surface composites fabricated by high-energy electron beam irradiation. Two kinds
of powder mixtures, i.e., 50Cr3C2-50STS304, 50CrB-50STS304 (wt.%), were placed on a plain carbon steel
substrate, which was then irradiated with electron beam without using flux. The surface composite layer of
1.0~1.3 mm in thickness was successfully formed without defects, and contained a large amount (up to 58
vol.%) of Cr7C3 or Cr1.65Fe0.35B0.9 in the austenite or martensite matrix. The hardness and wear resistance of
the surface composites layer were directly influenced by hard carbides or borides, and thus were about 2~3
times greater than those of the steel substrate. Particularly in the surface composite fabricated with CrB
powders, selective wear of the matrix was considerably reduced as a number of fine borides were
homogeneously distributed in the hard martensite matrix, thereby leading to the excellent wear resistance.
These findings suggested that the high-energy electron beam irradiation was useful for the development of
surface composites with improved hardness and wear resistance.

영어초록

The present study is concerned with the improvement of hardness and wear resistance in
(Cr3C2,CrB)/carbon steel surface composites fabricated by high-energy electron beam irradiation. Two kinds
of powder mixtures, i.e., 50Cr3C2-50STS304, 50CrB-50STS304 (wt.%), were placed on a plain carbon steel
substrate, which was then irradiated with electron beam without using flux. The surface composite layer of
1.0~1.3 mm in thickness was successfully formed without defects, and contained a large amount (up to 58
vol.%) of Cr7C3 or Cr1.65Fe0.35B0.9 in the austenite or martensite matrix. The hardness and wear resistance of
the surface composites layer were directly influenced by hard carbides or borides, and thus were about 2~3
times greater than those of the steel substrate. Particularly in the surface composite fabricated with CrB
powders, selective wear of the matrix was considerably reduced as a number of fine borides were
homogeneously distributed in the hard martensite matrix, thereby leading to the excellent wear resistance.
These findings suggested that the high-energy electron beam irradiation was useful for the development of
surface composites with improved hardness and wear resistance.

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