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한국열처리공학회> 열처리공학회지

열처리공학회지 update

Journal of the Korean Society for Heat Treatment

  • : 한국열처리공학회
  • : 공학분야  >  금속공학
  • : KCI후보
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  • : 연속간행물
  • : 격월
  • : 1225-1070
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수록정보
수록범위 : 1권1호(1988)~32권5호(2019) |수록논문 수 : 1,423
열처리공학회지
32권5호(2019년 09월) 수록논문
최근 권호 논문
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KCI후보

1주조용 TiAl 합금의 조직 미세화를 위한 반복열처리 공정 조건에 관한 연구

저자 : 공만식 ( Man-sik Kong ) , 양현석 ( Hyunseok Yang )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 5호 발행 연도 : 2019 페이지 : pp. 195-200 (6 pages)

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For expanding the applications and workability of TiAl alloy, elongation is very important property. Fine microstructure is needed for elongation and physical properties of TiAl alloys. In this study, The effects of cyclic heat treatment process for fine microstructure of Ti-46Al-Nb-W-Cr-Si-C alloy, which was made by VAR (vacuum arc remelting) and VIM(vacuum induction melting) centrifugal casting process, was investigated. Cycle heat treatment process was very effective for recrystallization of this TiAl system, which has microstructure size of 50~100 μm through pre-heat treatment, cyclic heat treatment in α+γ phase region and solution heat treatment respectively. Refined grain size was finally confirmed by photos of optical microscope and scanning electron microscope.

KCI후보

2저 탄소강의 오스테나이트 질화 시 암모니아 가스첨가 조건변화가 표면층 조직 및 기공변화에 미치는 영향

저자 : 이제원 ( Jewon Lee ) , 노용식 ( Y. S. Roh ) , 성장현 ( J. H. Sung ) , 임수근 ( S. G. Lim )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 5호 발행 연도 : 2019 페이지 : pp. 201-211 (11 pages)

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Low carbon steel (S20C steel) and SPCC steel sheet have been austenitic nitrided at 700℃ in a closed pit type furnace by changing the flow rate of ammonia gas and heat treating time. When the flow rate of ammonia gas was low, the concentration of residual ammonia appeared low and the hardness value of transformed surface layer was high. The depth of the surface layer, however, was shallow. With increasing the concentration of residual ammonia by raising up the ammonia gas flow, both the depth of the surface layer and the pore depth increased, while the maximum hardness of the surface layer decreased. By introducing a large amount of ammonia gas in a short time, a deep surface layer with minimal pores on the outermost surface was obtained. In this experiment, while maintaining 10~12% of residual ammonia, the flow rate of inlet ammonia gas, 7 liter/min, was introduced at 700℃ for 1 hour. In this condition, the thickness of the surface layer without pores appeared about 60 μm in S20C steel and 30 μm in SPCC steel plate. Injecting additional methane gas (carburizing gas) to this condition played a deteriorating effect due to promoting the formation of vertical pores in the surface layer. For 1st transformed surface layer for S20C steel, maintaining 10~12% residual ammonia condition via austenitic nitriding process resulted in ε phase with relatively high nitrogen concentration (just below 4.23 wt.%N) among the mixed phases of ε+γ. The ε phase was formed a specific orientation perpendicular to the surface. For 2nd transformed layer for S20C steel, γ phase was rather dominant (just above 2.63 wt.%N). For SPCC steel sheet, there appeared three phases, γ, α(M) and weak ε phase. The nitrogen concentration would be approximately 2.6 wt.% in these phases condition.

KCI후보

315-5PH 스테인리스강의 시효열처리 조건변화가 상변태 및 기계적 성질에 미치는 영향

저자 : 김태수 ( T. S. Kim ) , 이제원 ( Jewon Lee ) , 노용식 ( Y. S. Roh ) , 성장현 ( J. H. Sung ) , 임수근 ( S. G. Lim )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 5호 발행 연도 : 2019 페이지 : pp. 212-223 (12 pages)

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This study is to investigate the relationship between microstructural factors and tensile properties after aging heat treatment of the 15-5PH stainless steel at the temperature range of 450℃, 500℃ and 550℃ for various time. For the aging time of 2 hours, hardness showed maximum at 450℃ and then decreased with increasing aging temperature. While, hardness decreased gradually during aging 450℃, 500℃ and 550℃ from 1 hour to 5 hours but the hardness nearly unchanged until the 100 hours after 5 hours aging. When aging at 450℃, Cu atoms preferentially aggregated at the prior austenite grain boundaries and martensite lath boundaries, and Cu concentration at those boundaries was nearly unchanged even after aging for 100 hours. Therefore it was suggested that the coherency is still maintained after 100 hours aging at 450℃. Aging at 500℃ and 550℃ results in an increase in the concentration of Ni at the martensite lath boundaries and prior austenite grain boundaries, resulting in the formation of reversed austenite. Especially, when aged at 550℃ for 100 hours, the concentration of Ni remarkably increased at those boundaries, and thus the microstructure of herring bone shape was appeared. Considering the migration of Ni atom to the lath boundaries and prior austenite grain boundaries, Ni atoms contributed greatly to the formation of reversed austenite. On the other hand, it was found that Cu atoms hardly moving to those boundaries may not be contributed to the formation of reversed austenite. When aging at 450℃, the coarsening of the precipitated Cu atoms proceeded very slowly with increasing aging time, therefore the decrease in strengths were small but the reduction area was considerably increased due to the softening of the matrix. At the aging temperature of 500℃ and 550℃, the strengths decreased and the elongation and reduction area increased due to the appearance of the reversed austenite. Especially, the increase of reduction area was remarkable.

KCI후보

4전류제어가 가능한 AIP-PVD법으로 증착된 TiMoN 코팅층 특성평가

저자 : 신현정 ( Hyun-jung Shin ) , 김동배 ( Dong-bea Kim ) , 김성철 ( Seong-chul Kim ) , 김남수 ( Nam-su Kim )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 5호 발행 연도 : 2019 페이지 : pp. 224-229 (6 pages)

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PVD coating is a technology that can be applied to various industries, and is widely used for processing molds and machinery, improving performance of core parts, and extending the life. Therefore, there is a need for a research on a device and a process technology that can adjust the performance to suit each application. In this study, a PVD coating device with ion density control was used to deposit a coating layer on SKD 11, a cold die steel, with magnetron currents of 1 A, 2 A, 3 A at arc currents of 80 A, 100 A, 130 A. It examined the mechanical properties for each condition. Increasing the arc current and magnetron current could improve the thickness, adhesion, and hardness of the coating layer. Especially, When the magnetron current was high, it suppressed the droplets that could be generated by the high arc current, showing excellent surface uniformity and adhesion of the coating layer.

KCI후보

5제 7 장 분위기 밀봉식 가스 침탄 법

저자 : 손명진

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 5호 발행 연도 : 2019 페이지 : pp. 230-235 (6 pages)

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6열처리 용어 해설(11)

저자 : 한국열처리공학회

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 5호 발행 연도 : 2019 페이지 : pp. 236-238 (3 pages)

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1연안해역에서 석유오염물질의 세균학적 분해에 관한 연구

(2006)홍길동 외 1명심리학41회 피인용

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(2006)홍길동심리학41회 피인용

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(2006)홍길동41회 피인용

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한국생산기술연구원 순천대학교 동아대학교 세종대학교 한남대학교
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  • 2 순천대학교 (40건)
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