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한국주조공학회> 한국주조공학회지 (주조)> 반연속주조된 대형 블룸에서 발생하는 거시편석 및 석출물 거동

KCI등재

반연속주조된 대형 블룸에서 발생하는 거시편석 및 석출물 거동

Behavior of Macrosegregation and Precipitation Developed in Semi-continuously Cast Large Bloom

김혜주 ( Hyeju Kim ) , 이형록 ( Hyoungrok Lee ) , 김경아 ( Kyeong-a Kim ) , 이주동 ( Joodong Lee ) , 오경식 ( Kyung-sik Oh ) , 권상흠 ( Sang-hum Kwon ) , 김동규 ( Donggyu Kim )
  • : 한국주조공학회
  • : 한국주조공학회지 (주조) 39권1호
  • : 연속간행물
  • : 2019년 02월
  • : 7-13(7pages)

DOI


목차

1. 서론
2. 실험 방법
3. 결과 및 고찰
4. 결론
감사의 글
References

키워드 보기


초록 보기


						
Few studies of large blooms over 700 mm thick among those used for the forging of raw materials have been reported. The cooling rate difference between the surface and the center of a large bloom is large, and the degradation of the mechanical properties is likely in cases involving excessively coarse precipitates resulted from the slow cooling rate of a large bloom after casting. Therefore, a schematic investigation of the growth behaviors of precipitates while varying their locations in blooms is necessary. The dissolution behaviors of precipitates were investigated by simulating a reheating process during which the bloom is heated to a high temperature. The segregation behavior of the as-cast large bloom was also investigated. Reheating specimens were obtained after an isothermal heat treatment at 1150oC with various holding times to simulate the reheating process, with the samples undergoing a subsequent water quenching step. The precipitates were extracted using an electrolytic extractor and a particle size analysis was conducted with the aid of SEM, EDS, and TEM. In the present work, Al oxide, MnS and Nb carbide were mainly observed.

UCI(KEPA)

간행물정보

  • : 공학분야  > 금속공학
  • : KCI 등재
  • : -
  • : 격월
  • : 1598-706x
  • : 2288-8381
  • : 학술지
  • : 연속간행물
  • : 1981-2019
  • : 2044


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발행기관 최신논문
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1A356 합금 시편의 수축공 결함형상에 대한 피로해석용 형상 모델링 방법

저자 : 곽시영 ( Si-young Kwak ) , 조인성 ( In-sung Cho )

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 39권 1호 발행 연도 : 2019 페이지 : pp. 1-6 (6 pages)

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초록보기

During the casting process, it is possible to minimize shrinkage and blowholes by modifying the casting design. However, it is impossible to eliminate these factors completely. Therefore, mechanical design engineers apply a sufficient safety factor owing to the possibility of insufficient performances of the cast products. In this paper, prediction method of the fatigue life of cast products containing shrinkage is conducted by using CT (computed tomography) and the SSM (shape simplification method), and additional fatigue analyses are carried out. The analysis results are then compared to results from actual experiments on samples with shrinkage defects. It is found to be that the considering actual shrinkage in cast products by means of stress and fatigue analyses is more accurate and effective. It is also considered that the proposed hot spot method provides us a good tool to predict the fatigue lifes of cast product.

2반연속주조된 대형 블룸에서 발생하는 거시편석 및 석출물 거동

저자 : 김혜주 ( Hyeju Kim ) , 이형록 ( Hyoungrok Lee ) , 김경아 ( Kyeong-a Kim ) , 이주동 ( Joodong Lee ) , 오경식 ( Kyung-sik Oh ) , 권상흠 ( Sang-hum Kwon ) , 김동규 ( Donggyu Kim )

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 39권 1호 발행 연도 : 2019 페이지 : pp. 7-13 (7 pages)

다운로드

(기관인증 필요)

초록보기

Few studies of large blooms over 700 mm thick among those used for the forging of raw materials have been reported. The cooling rate difference between the surface and the center of a large bloom is large, and the degradation of the mechanical properties is likely in cases involving excessively coarse precipitates resulted from the slow cooling rate of a large bloom after casting. Therefore, a schematic investigation of the growth behaviors of precipitates while varying their locations in blooms is necessary. The dissolution behaviors of precipitates were investigated by simulating a reheating process during which the bloom is heated to a high temperature. The segregation behavior of the as-cast large bloom was also investigated. Reheating specimens were obtained after an isothermal heat treatment at 1150oC with various holding times to simulate the reheating process, with the samples undergoing a subsequent water quenching step. The precipitates were extracted using an electrolytic extractor and a particle size analysis was conducted with the aid of SEM, EDS, and TEM. In the present work, Al oxide, MnS and Nb carbide were mainly observed.

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18권 1호 ~ 18권 1호

KCI등재 SCI SCOUPUS

대한금속재료학회지
57권 3호 ~ 57권 3호

KCI등재 SCI SCOUPUS

대한금속재료학회지
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