Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Influence of Vertical Centrifugal Casting (V.C.C) Conditions and Alloying Elements on Microstructures of High Speed Steel

고속도강의 미세조직에 미치는 합금원소 및 수직원심주조 조건의 영향

  • Kim, Sug-Won (School of Advanced Materials Engineering, Research Institute of Advanced Materials Development(RIAMD) Chonbuk National University) ;
  • Lee, Ui-Jong (School of Advanced Materials Engineering, Research Institute of Advanced Materials Development(RIAMD) Chonbuk National University) ;
  • Woo, Kee-Do (School of Advanced Materials Engineering, Research Institute of Advanced Materials Development(RIAMD) Chonbuk National University) ;
  • Kim, Dong-Keon (School of Advanced Materials Engineering, Research Institute of Advanced Materials Development(RIAMD) Chonbuk National University)
  • 김석원 (전북대학교 신소재공학부, 신소재개발연구소) ;
  • 이의종 (전북대학교 신소재공학부, 신소재개발연구소) ;
  • 우기도 (전북대학교 신소재공학부, 신소재개발연구소) ;
  • 김동건 (전북대학교 신소재공학부, 신소재개발연구소)
  • Published : 2000.10.20
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Abstract

The HSS consists of hard carbide and matrix of martensite, and so its characteristics of wear resistance, fracture resistance, and surface roughness are good. This study was undertaken to investigate the influence of Nb and V and manufacturing conditions on microstructural behaviors and characteristics in the HSS cylindrical specimens(90 $mm^{O.D.}$ ${\times}$ 60 $mm^{I.D.}$ ${\times}$ 50 $mm^H$) manufactured using VCC(Vertical Centrifugal Casting). In the specimen of Fe-2C-6Cr-1.5W-3Mo-4V alloy, the amount of MC carbide was increased and $M_7C_3$ carbide was decreased with the increase of V and Nb contents. The primary VC carbide was formed and followed by the rod-type eutectic MC carbide was formed in the cell boundary in 9%V added specimen. MC carbide was increased, and $M_7C_3$ carbide was decreased with the addition of Nb content. In the specimen containing more than 3%Nb, primary NbC carbide was formed within the cell of matrix. With increase in rpm, cell and carbides became fine, and amount of carbide $M_7C_3$ was decreased due to increase in cooling rate.

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