Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of Alloying Elements and Homogenization Treatment on Carbide Formation Behavior in M2 High Speed Steels

합금성분변화와 균질화처리에 따른 M2 고속도강의 탄화물 형성거동

  • Ha, Tae Kwon (Department of Advanced Metal and Materials Engineering, Gangneung-Wonju National University) ;
  • Yang, Eun Ig (Department of Civil Engineering, Gangneung-Wonju National University) ;
  • Jung, Jae Young (Research Institute of Industrial Science & Technology, Pohang) ;
  • Park, Shin Wha (Research Institute of Industrial Science & Technology, Pohang)
  • 하태권 (강릉원주대학교 신소재금속공학과) ;
  • 양은익 (강릉원주대학교 토목공학과) ;
  • 정재영 (포항산업과학연구원 Ti 제련연구팀) ;
  • 박신화 (포항산업과학연구원 울산산업기술연구본부)
  • Received : 2010.03.11
  • Published : 2010.07.22
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Abstract

In the present study, the effect of variation in alloying elements on the carbide formation behavior during casting and homogenization treatment of M2 high speed steels was investigated. M2 high speed steels of various compositions were produced by vacuum induction melting. Contents of C, Cr, W, Mo, and V were varied from the basic composition of 0.8C, 0.3Si, 0.2Mn, 4.0Cr, 6.0W, 5.0Mo, and 2.0V in weight percent. Homogenization treatment at $1150^{\circ}C$ for 1.5 hr followed by furnace cooling was performed on the ingots. Area fraction and chemical compositions of eutectic carbide in as-cast and homogenized ingots were analyzed. Area fraction of eutectic carbide appeared to be higher in the ingots with higher contents of alloying elements the area fraction of eutectic carbide also appeared to be higher on the surface regions than in the center regions of ingots. As a result of the homogenization treatment, $M_2C$ carbide, which was the primary eutectic carbide in the as-cast ingots, decomposed into thermodynamically stable carbides, MC and $M_6C$. The latter carbide was found to be the main one after homogenization. Fine carbides uniformly distributed in the matrix was found to be MC type carbide and coarsened by homogenization.

Keywords

Acknowledgement

Supported by : 강릉원주대학교

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