Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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A Study on the Toughness of Die Steel Coated with VC (vanadium carbide) by Immersing in Molten Borax Bath

용융염 침적법에 의한 VC Coating 금형강의 인성에 관한 연구

  • Lee, B.K. (Dept. of Metal Inchon Industrial Masters' College) ;
  • Nam, T.W. (Dept. of Metallurgical & Material Engineering Han Yang University)
  • 이병권 (인천기능대학 금속학과) ;
  • 남태운 (한양대학 금속재료공학과)
  • Published : 1993.06.30
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Abstract

Bending fracture strength test and impact strength test were made for VC coated die steels treated by immersing in molten borax bath and for hardened steels which were quenched and tempered, in order to clarify the effect of VC coating at $1000^{\circ}C$. The material used in this investigation was representative cold and hot work die steels STD11, STD61. The results obtained are as follows. 1) The bending fracture strength of VC coated die steel (STD11, STD61) was lessened with increasing the thickness of the VC coated layer. 2) With increasing the immersing time (imcreasing the thickness of the VC coated layer) the maximum hardness was obtained at 480 minutes holding, after that holding time hardness was decreased. 3) The impact strength of the VC coated die steel was not decreased. In the casse of STD11, it was higher than that of the quenched condition especially at low tempering temperature, and vice versa at high tempering temperature. However in the case of STD61 shows the result to the contrary.

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