열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제13권4호
  • /
  • Pages.246-252
  • /
  • 2000
  • /
  • 1225-1070(pISSN)
  • /
  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
권호 표지

PTA법에 의한 스텔라이트 12 합금 육성층의 조직과 경도에 미치는 전류와 예열온도의 영향

The Effect of Current and Preheat Temperature on Structure and Hardness of Stellite 12 Alloy Overlayer by PTA Process

  • 정병호 (부경대학교 재료공학부) ;
  • 김무길 (부경대학교 재료공학부) ;
  • 김규덕 (부경대학교 재료공학부) ;
  • 김민영 (부경대학교 재료공학부) ;
  • 이성열 (한국해양대학교 기계소재공학부)
  • Jung, B.H. (Division of Materials Science and Eng., Pukyong National University) ;
  • Kim, M.G. (Division of Materials Science and Eng., Pukyong National University) ;
  • Kim, G.D. (Division of Materials Science and Eng., Pukyong National University) ;
  • Kim, M.Y. (Division of Materials Science and Eng., Pukyong National University) ;
  • Lee, S.Y. (Division of Mechanical & Material Eng., Korea Maritime University)
  • 투고 : 2000.06.05
  • 발행 : 2000.07.30
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초록

Stellite 12 alloy-powder was overlaid on 410 stainless steel valve seat using plasma transferred arc(PTA) process. Variation of characteristic of microstructure and hardness of deposit with current(90~150 A) and preheat temperature(R.T.~$400^{\circ}C$) was investigated. Important conclusion obtained are as follows; All welding conditions used produced a sound deposit layer with no defect in single pass welding. The maximum deposit had 4.0~4.8 mm in thickness and its bead width was increased with increase of current and preheat temperature. The deposit showed hypoeutectic microstruture, which was consisting of primary cobalt dendrite and networked $M_7C_3$ type eutectic carbides. The amount of eutectic carbides was decreased and its dendritic secondary arm spacing was increased with increase of current. Hardness of the deposit was decreased with increase of current. Preheat temperature up to $400^{\circ}C$, however, showed little influence on the hardness and microstructure. The hardness was also influenced by diluted Fe content near the interface in addition to microstructure and dendritic secondary arm spacing. Hot hardness at $500^{\circ}C$ showed higher than 300 HV.

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