Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Mechanical Properties of The CO2 Free Vacuum Carburized in SCM415H

CO2 무 배출 침탄 열처리된 SCM415H 소재의 기계적 성질

  • Byun, Jae-Hyuk (Dept. of Intelligent Mechanical Engineering, Kumoh Nat'l Institute of Technology) ;
  • Ro, Seung-Hoon (Dept. of Intelligent Mechanical Engineering, Kumoh Nat'l Institute of Technology) ;
  • Lee, Jong-Hyung (Dept. of Intelligent Mechanical Engineering, Kumoh Nat'l Institute of Technology) ;
  • Lee, Chang-Hun (Production Technology Research Institute, Kumoh Nat'l Institute of Technology) ;
  • Yang, Seong-Hyeon (Production Technology Research Institute, Kumoh Nat'l Institute of Technology)
  • 변재혁 (금오공과대학교 지능기계공학부) ;
  • 노승훈 (금오공과대학교 지능기계공학부) ;
  • 이종형 (금오공과대학교 지능기계공학부) ;
  • 이창헌 (금오공과대학교 생산기술 연구소) ;
  • 양성현 (금오공과대학교 생산기술 연구소)
  • Received : 2011.12.14
  • Accepted : 2012.06.29
  • Published : 2012.09.01
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Abstract

Vacuum carburizing is supposed to be the superior process to the gas carburizing. However, the vacuum carburizing has the stage in which hydrocarbon gas is supplied into the furnace to be pyrolysis, and consequently the stable heat treatment is hard to achieve due to the soot from the hydrocarbon pyrolysis. Recently, many studies have been made which utilize acetylene gas to overcome this defects. In this paper, the carburizing and the diffusion periods have been selected based on the Harris experimental formula, and the mechanical properties of the vacuum carburized specimen have been compared with those of the gas carburized SCM415H specimen to identify the feasibility of the $CO_2$ free vacuum carburizing process. The result showed that the vacuum carburized materials used have no oxidization of the grain boundaries, and show the 29.8% higher effective hardness depth and the acceptable tensile strength.

진공침탄법은 이산화탄소의 발생이 없는 친환경적인 열처리 방식으로 알려져 있다. 그러나 진공침탄법은 탄화수소 가스(메탄, 프로판)를 노내에 직접 공급하여 열분해하는 과정을 거침으로써 노내에 그을음이 발생하여 안정적인 조업이 불가능한 단점이 있다. 최근에는 이러한 단점을 극복하기위한 불포화 탄화수소인 아세틸렌가스를 이용한 진공침탄법이 활발히 연구되고 있다. 본 논문에서는 아세틸렌가스를 이용한 진공침탄방식의 침탄 및 확산 시간을 변수로 하여 여러 가지 조건에서 열처리를 진행한 후 가스침탄 열처리된 소재와 기계적 성질을 비교 분석하여 이산화탄소 무 배출 진공침탄 열처리 방법의 활용가능성을 확인하였다. 연구결과 본 연구에서 시도된 진공침탄법은 가스침탄에서 나타나는 입계산화층이 발생하지 않았으며 경도 값은 진공침탄 시험편의 유효경화 깊이가 29.8% 크게 나타났으며 인장강도는 가스침탄보다 10%낮게 나왔으나 허용치를 충분히 만족하는 수준이었다.

Keywords

References

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