Salt bath heat treatment is usually used but recently vacuum heat treatment is increased for the heat treatment of hot work die steels. The differences in two heat treatment processes were compared by testing the mechanical properties of heat treated products. With two different features of processes, mechanical properties such as hardness, tensile strength and impact strength of products show very different results. “In this study, salt bath heat treated products” showed higher tensile strength and impact strength than vacuum heat treated products but hardness was not much different. These lower mechanical properties of vacuum heat treated products are due to differences in heating and quenching process

Abstract
 1. 서론
 2. 실험방법
  2.1 시험편제작
  2.2 기계적 성질
  2.3 열처리실험
  2.3 진공열처리조건
  2.4 염욕열처리조건
 3. 결과 및 고찰
  3.1 경도에 미치는 냉각 방법의 영향
  3.2 경도에 미치는 뜨임의 영향
  3.3 인장강도에 미치는 냉각 방법의 영향
  3.4 인장강도에 미치는 뜨임의 영향
  3.5 충격인성에 미치는 냉각방법의 영향
  3.6 충격인성시험에 미치는 뜨임의 영향
  3.7 미세조직에 미치는 냉각방법의 영향
  3.8 미세조직에 미치는 뜨임의 영향
 4. 결론
 References

• 김제돈(공주대학교 일반대학원 신소재공학부) | Je Don Kim
• 박기호(주식회사 한국금형열처리 대표이사) | Ki Ho Park